0001564590-21-009169 | 10-K | XBRL Viewer

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Document And Entity Information - USD ($) $ in Millions	12 Months Ended
Document And Entity Information - USD ($) $ in Millions	Dec. 31, 2020	Feb. 19, 2021	Jun. 30, 2020
Cover [Abstract]
Entity Registrant Name	ICF INTERNATIONAL, INC.
Entity Central Index Key	0001362004
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Document Annual Report	true
Document Transition Report	false
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Interactive Data Current	Yes
Entity Well-known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding (in shares)		18,874,883
Entity Public Float			$ 1,170
Document Type	10-K
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity File Number	001-33045
Entity Tax Identification Number	22-3661438
ICFR Auditor Attestation Flag	true
Entity Incorporation State Country Code	DE
Entity Address, Address Line One	9300 Lee Highway
Entity Address, City or Town	Fairfax
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	22031
City Area Code	703
Local Phone Number	934-3000
Title of each class	Common Stock, $0.001 par value
Trading Symbol	ICFI
Security Exchange Name	NASDAQ
Documents Incorporated by Reference	Part III incorporates information by reference from the Proxy Statement for the 2021 Annual Meeting of Stockholders expected to be held in May 2021.

Consolidated Balance Sheets - USD ($)
$ in Thousands

Dec. 31, 2020

Dec. 31, 2019

Current Assets:

Cash and cash equivalents

$ 13,841

$ 6,482

Restricted cash - current

^[1]

68,146

Contract receivables, net

222,850

261,176

Contract assets

143,369

142,337

Prepaid expenses and other assets

25,492

17,402

Income tax receivable

1,977

7,320

Total Current Assets

475,675

434,717

Total Property and Equipment, net

62,434

58,237

Other Assets:

Goodwill

909,913

719,934

Other intangible assets, net

59,887

25,829

Operating lease - right-of-use assets

127,132

133,965

Other assets

32,249

23,352

Total Assets

1,667,290

1,396,034

Current Liabilities:

Current portion of long-term debt

10,000

Accounts payable

91,365

134,578

Contract liabilities

42,050

37,413

Operating lease liabilities - current

23,350

32,500

Accrued salaries and benefits

80,512

52,130

Accrued subcontractors and other direct costs

78,842

45,619

Accrued expenses and other current liabilities

100,908

36,811

Total Current Liabilities

427,027

339,051

Long-term Liabilities:

Long-term debt

303,214

164,261

Operating lease liabilities - non-current

115,614

119,250

Deferred income taxes

34,330

37,621

Other long-term liabilities

40,144

21,300

Total Liabilities

920,329

681,483

Commitments and Contingencies (Note 20)

Stockholders’ Equity:

Preferred stock, par value $.001 per share; 5,000,000 shares authorized; none issued

Common stock, $.001 par value; 70,000,000 shares authorized; 23,305,255 and 22,846,374 shares issued; and 18,909,983 and 18,867,555 shares outstanding at December 31, 2020 and December 31, 2019, respectively

Additional paid-in capital

369,058

346,795

Retained earnings

588,731

544,840

Treasury stock, 4,395,272 and 3,978,819 shares at December 31, 2020 and 2019, respectively

196,745

164,963

Accumulated other comprehensive loss

(14,106)

(12,144)

Total Stockholders’ Equity

746,961

714,551

Total Liabilities and Stockholders’ Equity

$ 1,667,290

$ 1,396,034

[1]	Restricted cash – current at the beginning of the year ended December 31, 2018 represents amounts held in an escrow account for the acquisition of The Future Customer (“TFC”).

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized (in shares)	70,000,000	70,000,000
Common stock, issued (in shares)	23,305,255	22,846,374
Common stock, outstanding (in shares)	18,909,983	18,867,555
Treasury stock, shares (in shares)	4,395,272	3,978,819

Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Revenue	$ 1,506,875	$ 1,478,525	$ 1,337,973
Direct costs	972,406	953,187	857,508
Operating costs and expenses
Indirect and selling expenses	411,612	395,763	360,987
Depreciation and amortization	20,399	20,099	17,163
Amortization of intangible assets	13,349	8,083	10,043
Total operating costs and expenses	445,360	423,945	388,193
Operating income	89,109	101,393	92,272
Interest expense	(13,892)	(10,719)	(8,710)
Other expense	(544)	(501)	(735)
Income before income taxes	74,673	90,173	82,827
Provision for income taxes	19,714	21,235	21,427
Net income	$ 54,959	$ 68,938	$ 61,400
Earnings per share:
Basic	$ 2.92	$ 3.66	$ 3.27
Diluted	$ 2.87	$ 3.59	$ 3.18
Weighted-average common shares outstanding:
Basic	18,841	18,816	18,797
Diluted	19,135	19,224	19,335
Cash dividends declared per common share	$ 0.56	$ 0.56	$ 0.56
Other comprehensive (loss) income, net of tax	$ (1,962)	$ 407	$ (6,683)
Comprehensive income, net of tax	$ 52,997	$ 69,345	$ 54,717

Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands

Total

Cumulative-Effect Adjustments for Adoption of Accounting Principle

Common Stock

Additional Paid-in Capital

Retained Earnings

Cumulative-Effect Adjustments for Adoption of Accounting Principle

Treasury Stock

Accumulated Other Comprehensive Loss

Cumulative-Effect Adjustments for Adoption of Accounting Principle

^[1]

Balance at Dec. 31, 2017

$ 616,030

$ 22

$ 307,821

$ 434,766

$ (121,540)

$ (5,039)

$ (829)

Balance (in shares) at Dec. 31, 2017

18,662

3,357

Net income

61,400

Other comprehensive income (loss)

(6,683)

Equity compensation

11,506

11,328

$ 178

Exercise of stock options

5,842

Exercise of stock options (in shares)

209

Issuance of shares pursuant to vesting of restricted stock units (in shares)

226

Net payments for stock issuances and buybacks

(17,125)

1,217

$ (18,342)

Net payments for stock issuances and buybacks (in shares)

(280)

280

Reclassification of stranded tax effects due to adoption of accounting principle

829

(829)

Balance at Dec. 31, 2018

660,417

$ 22

326,208

486,442

$ (139,704)

(12,551)

Dividends declared

(10,553)

Balance (in shares) at Dec. 31, 2018

18,817

3,629

Net income

68,938

Other comprehensive income (loss)

407

Equity compensation

15,818

Exercise of stock options

2,924

Exercise of stock options (in shares)

Issuance of shares pursuant to vesting of restricted stock units

$ 1

Issuance of shares pursuant to vesting of restricted stock units (in shares)

306

Net payments for stock issuances and buybacks

(23,414)

1,845

$ (25,259)

Net payments for stock issuances and buybacks (in shares)

(349)

349

Balance at Dec. 31, 2019

714,551

$ 23

346,795

544,840

$ (164,963)

(12,144)

Dividends declared

(10,540)

Balance (in shares) at Dec. 31, 2019

18,868

3,978

Net income

54,959

Other comprehensive income (loss)

(1,962)

Equity compensation

17,555

Exercise of stock options

2,652

Exercise of stock options (in shares)

Issuance of shares pursuant to vesting of restricted stock units (in shares)

389

Net payments for stock issuances and buybacks

(29,726)

2,056

$ (31,782)

Net payments for stock issuances and buybacks (in shares)

(417)

417

Balance at Dec. 31, 2020

746,961

$ (513)

$ 23

$ 369,058

588,731

$ (513)

$ (196,745)

$ (14,106)

Accounting Standards Update Extensible List

us-gaap:AccountingStandardsUpdate201613Member

Dividends declared

$ (10,555)

Balance (in shares) at Dec. 31, 2020

18,910

4,395

[1]	The Company has adjusted the balance of accumulated other comprehensive (loss) income at December 3, 2017 after the adoption of ASU 2018-02.

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows from Operating Activities
Net income	$ 54,959	$ 68,938	$ 61,400
Adjustments to reconcile net income to net cash provided by operating activities:
Bad debt expense	4,062	624	2,480
Deferred income taxes	(1,865)	(123)	5,100
Non-cash equity compensation	17,555	15,818	11,506
Depreciation and amortization	33,748	28,182	27,206
Non-cash lease expense	(2,307)	(1,247)	523
Facilities consolidation reserve	(288)	(274)	(260)
Remeasurement of contingent acquisition liability			505
Amortization of debt issuance costs	710	507	510
Impairment of long-lived assets	3,090	1,728
Other adjustments, net	964	181	449
Changes in operating assets and liabilities, net of the effect of acquisitions:
Net contract assets and liabilities	6,064	(11,963)	(14,148)
Contract receivables	54,384	(31,300)	(60,096)
Prepaid expenses and other assets	(5,410)	1,997	(6,650)
Accounts payable	(51,177)	31,949	28,309
Accrued salaries and benefits	26,810	8,012	(2,159)
Accrued subcontractors and other direct costs	32,544	(12,293)	10,762
Accrued expenses and other current liabilities	(18,198)	(4,951)	11,120
Income tax receivable and payable	5,375	(4,489)	(2,063)
Other liabilities	12,125	144	176
Net Cash Provided by Operating Activities	173,145	91,440	74,670
Cash Flows from Investing Activities
Capital expenditures for property and equipment and capitalized software	(17,683)	(26,901)	(21,812)
Payments for business acquisitions, net of cash acquired	(253,265)	(3,569)	(34,575)
Net Cash Used in Investing Activities	(270,948)	(30,470)	(56,387)
Cash Flows from Financing Activities
Advances from working capital facilities	1,020,451	686,830	573,991
Payments on working capital facilities	(870,114)	(721,809)	(579,817)
Payments on capital expenditure obligations	(1,712)	(1,621)	(3,726)
Receipt of restricted contract funds	65,694
Payment of restricted contract funds	(106)
Debt issue costs	(2,094)		(21)
Proceeds from exercise of options	37	2,914	5,842
Dividends paid	(10,551)	(10,540)	(7,915)
Net payments for stockholder issuances and buybacks	(29,726)	(23,414)	(17,125)
Payments on business acquisition liabilities	1,924
Net Cash Provided by (Used in) Financing Activities	169,955	(67,640)	(28,771)
Effect of Exchange Rate Changes on Cash, Cash Equivalents, and Restricted Cash	3,353	166	(792)
Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash	75,505	(6,504)	(11,280)
Cash, Cash Equivalents, and Restricted Cash, Beginning of Period	6,482	12,986	24,266
Cash, Cash Equivalents, and Restricted Cash, End of Period	81,987	6,482	12,986
Supplemental disclosure of cash flow information:
Interest	14,337	10,424	9,893
Income taxes	15,954	$ 26,595	14,870
Non-cash investing and financing transactions:
Deferred and contingent consideration arising from businesses acquired			8,391
Capital expenditure obligations			$ 6,121
Tenant improvements funded by lessor	3,124
Exercise of options receivable from shareholders	$ 2,615

Basis of Presentation and Nature of Operations

12 Months Ended

Dec. 31, 2020

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Basis of Presentation and Nature of Operations

NOTE 1 - BASIS OF PRESENTATION AND NATURE OF OPERATIONS

Basis of Presentation

The accompanying consolidated financial statements include the accounts of ICF International, Inc. (“ICFI”) and its principal subsidiary, ICF Consulting Group, Inc. (“Consulting,” and together with ICFI, “the Company”), and have been prepared in accordance with United States (“U.S.”) generally accepted accounting principles (“U.S. GAAP”). Consulting is a wholly owned subsidiary of ICFI. ICFI is a holding company with no operations or assets other than its investment in the common stock of Consulting. All other subsidiaries of the Company are wholly owned by Consulting. All significant intercompany transactions and balances have been eliminated.

Nature of Operations

The Company provides professional services and technology-based solutions to government and commercial clients, including management, marketing, technology, and policy consulting and implementation services, in the areas of energy, environment, and infrastructure; health, education, and social programs; safety and security; and consumer and financial. The Company offers a full range of services to these clients throughout the entire life cycle of a policy, program, project, or initiative, from research and analysis and assessment and advice to design and implementation of programs and technology-based solutions, and the provision of engagement services and programs.

The Company’s major clients are U.S. federal government departments and agencies, most significantly the Department of Health and Human Services, Department of State, and Department of Defense. The Company also serves U.S. state (including territories) and local government departments and agencies, international governments, and commercial clients worldwide. Commercial clients include airlines, airports, electric and gas utilities, health care companies, banks and other financial services companies, transportation, travel and hospitality firms, non-profits/associations, manufacturing firms, retail chains, and distribution companies. The term “federal” or “federal government” refers to the U.S. federal government, and “state and local” or “state and local government” refers to U.S. state (including territories) and local governments, unless otherwise indicated.

The Company, incorporated in Delaware, is headquartered in Fairfax, Virginia. It maintains offices throughout the world, including over 56 offices in the U.S. and U.S. territories and more than 22 offices in key markets outside the U.S., including offices in the United Kingdom (“U.K.), Belgium, China, India and Canada.

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

NOTE 2 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Use of Estimates

The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent liabilities at the date of the consolidated financial statements, and the reported amounts of revenue and expenses during the reporting periods. Areas of the consolidated financial statements where estimates may have the most significant effect include contractual and regulatory reserves, valuation and lives of tangible and intangible assets, contingent consideration related to business acquisitions, impairment of goodwill and long-lived assets, accrued liabilities, revenue recognition and costs to complete fixed-price contracts, bonus and other incentive compensation, stock-based compensation, reserves for tax benefits and valuation allowances on deferred tax assets, provisions for income taxes, collectability of receivables, and loss accruals for litigation. Actual results experienced by the Company may differ from management's estimates.

Reclassifications

Certain amounts in the December 31, 2019 balance sheet have been reclassified to conform to the current year presentation.

As part of an amendment to the Credit Facility, as defined in Note 10 “Long-term Debt” below, the Company currently has both a term loan and a revolving debt facility within its Credit Facility. Previously, the unamortized debt issuance costs were included within Other assets in accordance with U.S. GAAP. The Company has reclassified unamortized debt issuance costs as of December 31, 2019 as Long-term debt for consistency of presentation.

As part of recording the fair value of interest rate swaps, as defined in Note 19 “Fair Value” below, the Company has presented both a current and long-term component of the fair value of the interest rate swaps. Previously, the fair value of the interest rate swaps was included in other long-term liabilities. The Company has reclassified the current portion of the fair value of the interest rate swaps to other current liabilities as of December 31, 2019 for consistency of presentation.

Revenue Recognition

The Company primarily provides services and technology-based solutions for clients that operate in a variety of markets and the solutions may span the entire program life cycle, from initial research and analysis to the design and implementation of solutions. The Company enters into agreements with clients that create enforceable rights and obligations and for which it is probable that the Company will collect the consideration to which it will be entitled as services and solutions are transferred to the client. Except in certain narrowly defined situations, the Company’s agreements with its clients are written and revenue is generally not recognized on oral or implied arrangements. The Company recognizes revenue based on the consideration specified in the applicable agreement and excludes from revenue amounts collected on behalf of third parties. Accordingly, sales and similar taxes which are collected on behalf of third parties are excluded from the transaction price.

The Company evaluates whether two or more agreements should be accounted for as one single contract and whether combined or single agreements should be accounted for as more than one performance obligation. For most contracts, the client requires the Company to perform a number of tasks in providing an integrated output for which the client has contracted, and, hence, contracts of this type are tracked as having only one performance obligation since a substantial part of the Company’s promise is to ensure the individual tasks are incorporated into a combined output in accordance with contract requirements. When contracts are separated into multiple performance obligations, the Company allocates the total transaction price to each performance obligation based on the estimated relative standalone selling prices of the promised services underlying each performance obligation. The Company generally provides customized solutions in which the pricing is based on specific negotiations with each client, and, in these cases, the Company uses a cost-plus margin approach to estimate the standalone selling price of each performance obligation. It is common for the Company’s long-term contracts to contain award fees, incentive fees or other provisions that can either increase or decrease the transaction price. These variable amounts are generally awarded at the completion of a contractually stipulated performance assessment period based on the achievement of performance metrics, program milestones or cost targets, and the amount awarded may be subject to client discretion. Variable consideration is estimated based on the most likely amount. Once the Company selects a method to estimate variable consideration, it applies that method consistently. Estimates of variable consideration will be constrained only to the extent that it is probable that significant reversal in the amount of cumulative revenue recognized will not occur.

The Company evaluates contractual arrangements to determine whether revenue should be recognized on a gross versus net basis. The Company’s assessment is based on the nature of the promise to the client. In most cases, the Company itself agrees to provide specified services to the client as a principal and revenue is recognized on a gross basis. In certain instances, the Company acts as an agent and merely arranges for another party to provide services to the client and revenue is recognized on a net basis in reflection of the fact that the Company does not control the goods or services provided to the client by the other party.

Long-term contracts typically contain billing terms that provide for invoicing monthly or upon completion of milestones, and payment on a net 30-day basis. Exceptions to monthly billing terms are to ensure that the Company performs satisfactorily rather than representing a significant financing component. For cost-based contracts the Company’s performance is evaluated during a contractually stipulated performance period and, while contract costs may be billed on a monthly basis, the Company is generally permitted to bill for incentive or award fees only after the completion of the performance assessment period, which may occur quarterly, semi-annually or annually, and after the client completes the performance assessment. Fixed-price contracts may provide for milestone billings based on the attainment of specific project objectives rather than for billing on a monthly basis. Moreover, contracts may require retentions or hold backs that are paid at the end of the contract to ensure that the Company performs in accordance with requirements. The Company does not assess whether a contract contains a significant financing component if the Company expects, at contract inception, that the period between payment by the client and the transfer of promised services to the client will be one year or less.

As a service provider, the Company generally recognizes revenue over time as control is transferred to a client, based on the extent of progress towards satisfaction of the performance obligation. The selection of the method used to measure progress requires judgment and is dependent, among other factors, on the contract type selected by the client during contract negotiation and the nature of the services and solutions to be provided.

When a performance obligation is billed using a time-and-materials contract type, the Company uses the right to invoice practical expedient output progress measure to estimate revenue earned based on hours worked in contract performance at negotiated billing rates. Fixed-price level-of-effort contracts are substantially similar to time-and-materials contracts except that the Company is required to deliver a specified level of effort over a stated period of time. For these contracts, the Company estimates revenue earned using contract hours worked at negotiated bill rates as the Company delivers the contractually required workforce.

For cost-based contracts, the Company recognizes revenue based on contract costs incurred, as the Company becomes contractually entitled to reimbursement of the contract costs, plus a most likely estimate of award or incentive fees earned on those costs even though final determination of fees earned occurs after the contractually-stipulated performance assessment period ends.

For performance obligations requiring the delivery of a service for a fixed price, the Company uses the ratio of actual costs incurred to total estimated costs, provided that costs incurred (an input method) represents a reasonable measure of progress towards the satisfaction of a performance obligation, in order to estimate the portion of total revenue earned. This method provides a faithful depiction of the transfer of value to the client when the Company is satisfying a performance obligation that entails integration of tasks for a combined output, which requires the Company to coordinate the work of employees, subcontractors and delivery of other contract costs. Contract costs that are not reflective of the Company’s progress toward satisfying a performance obligation are not included in the calculation of the measure of progress. When this method is used, changes in estimated costs to complete these obligations result in adjustments to revenue on a cumulative catch-up basis, which causes the effect of revised estimates for prior periods to be recognized in the current period. Changes in these estimates can routinely occur over contract performance for a variety of reasons, which include: changes in contract scope; changes in contract cost estimates due to unanticipated cost growth or reassessments of risks impacting costs; changes in estimated incentive or award fees; or performing better or worse than previously estimated.

In some fixed price service contracts, the Company performs services of a recurring nature, such as maintenance and other services of a “stand ready” nature. For these contracts, the Company has the right to consideration in an amount that corresponds directly with the value that the client has received. Therefore, the Company records revenue on a time elapsed basis to reflect the transfer of control to the client throughout the contract.

Contracts are often modified to reflect changes in contract specifications and requirements, and these changes may create new enforceable rights and obligations. Most modifications are for services that are not distinct from the existing agreement due to the significant integration service that the Company provides. Therefore, most modifications are accounted for as part of an existing performance obligation. The effect of these modifications on transaction price, and the Company’s measure of progress in fulfilling the performance obligation to which they relate, may be recognized as an adjustment to revenue on a cumulative catch-up basis. Revenue from modifications that create new, distinct performance obligations is recognized based on the Company’s progress in fulfilling the requirements of the new obligation.

For contracts in which the estimated cost to perform exceeds the consideration to be received, the Company accrues for the entire estimated loss during the period in which the loss is determined by recording additional direct costs.

For performance obligations that are satisfied over time, the Company recognizes the cost to fulfill contracts as incurred, unless the costs are within the scope of another topic in which case the guidance of that topic is applied. The Company evaluates incremental costs of obtaining a contract and, if they are recoverable from the client and relate to a specific future contract, they are deferred and recognized over contract performance or the estimated life of the customer relationship if renewals are expected. The Company expenses these costs when incurred if the amortization period is one year or less.

Unfulfilled performance obligations represent amounts expected to be earned on contracts and do not include the value of negotiated, unexercised contract options, which are classified as marketing offers. Indefinite delivery/indefinite quantity and similar arrangements provide a framework for the client to issue specific tasks, delivery or purchase orders in the future and these arrangements are considered marketing offers until a specific order is executed.

Revenue recognition entails the use of significant judgment, including, but not limited to, the following: evaluating agreements in terms of the number and nature of performance obligations; determining the appropriate method for measuring progress to satisfaction of obligations; determining if the Company is acting as a principal or an agent, and preparing estimates in terms of the amount of progress that the Company has made. For many fixed-price contracts, in particular, the Company estimates the proportion of total revenue earned using the ratio of contract costs incurred to total estimated contract costs, which requires the Company to prepare and, as necessary, revise estimates, as work progresses, of the total contract costs required to satisfy each respective performance obligation. Moreover, some of the Company’s contracts include variable consideration, which requires the Company to estimate and, as necessary, revise the most likely amounts that will be earned over the respective performance assessment periods. For these obligations, changes in estimates result in cumulative catch-up adjustments and may have a significant impact on earnings during a given period.

The Company’s operating cycle for long-term contracts may be greater than one year and is measured by the average time intervening between the inception and the completion of those contracts. Contract-related assets and liabilities are classified as current assets and current liabilities. Significant balance sheet accounts related to the revenue recognition cycle are as follows:

Contract receivables, net – This account includes amounts billed or billable under contract terms. The amounts due are stated at their net realizable value. The Company maintains an allowance for doubtful accounts to provide for the estimated amount of receivables that will not be collected. The Company considers a number of factors in its estimate of the allowance, including knowledge of a client’s financial condition, its historical collection experience, and other factors relevant to assessing the collectability of the receivables. The Company writes off specific contract receivables when such amounts are determined to be uncollectible.

Contract assets – This account includes unbilled amounts typically resulting from revenue recognized on long-term contracts when the amount of revenue recognized exceeds the amounts billed. It also includes contract retainages until the Company has met the contract-stipulated requirements for payment. Contract assets are reported in a net position on a contract by contract basis each period even though individual contracts may contain multiple performance obligations. On a contract by contract basis, amounts do not exceed their net realizable value.

Contract liabilities – This account consists of advance payments received and billings in excess of revenue recognized on long-term contracts. Contact liabilities are reported in a net position on a contract by contract basis each period even though individual contracts may contain multiple performance obligations.

Cash and Cash Equivalents

The Company considers cash on deposit and all highly liquid investments with original maturities of three months or less when purchased to be cash and cash equivalents.

Restricted Cash

The Company had restricted cash representing amounts held in escrow accounts and/or not readily available due to contractual restrictions.

Property and Equipment

Property and equipment are carried at cost and are depreciated using the straight-line method over their estimated useful lives, which range from two to seven years. Leasehold improvements are amortized on a straight-line basis over the shorter of the economic life of the improvement or the related lease term.

Goodwill and Other Intangible Assets

The purchase price of an acquired business is allocated to the tangible assets and separately identifiable intangible assets acquired, less liabilities assumed, based on their respective fair values, with the excess recorded as goodwill. Goodwill represents the excess of costs over the fair value of net assets of businesses acquired. Goodwill and intangible assets acquired in a business combination and determined to have an indefinite useful life are not amortized, but instead are reviewed for impairment annually, or more frequently if impairment indicators arise. Intangible assets with estimable useful lives are amortized over such lives and reviewed for impairment if impairment indicators arise.

Impairment

The Company performs its annual goodwill impairment test as of October 1 of each year. As its business is highly integrated and all of its components have similar economic characteristics, the Company has concluded it has one aggregated reporting unit at the consolidated entity level. The Company assesses goodwill at the reporting level. If, after opting to complete a qualitative assessment, the Company determines that it is more likely than not that the estimated fair value of the reporting unit exceeded its carrying amount, it may conclude that no impairment exists. If the Company concludes otherwise, a goodwill impairment test must be performed, which includes a comparison of the reporting unit’s fair value to the carrying amount and recognizing, as an impairment loss, the difference of the reporting unit’s fair value and the carrying amount of goodwill.

The Company’s qualitative analysis as of October 1, 2020 included macroeconomic, industry and market specific considerations, financial performance indicators and measurements, and other factors. Based on this qualitative assessment, the Company determined that it is more likely than not that the fair value of its reporting unit exceeded its carrying amount, and thus any additional quantitative impairment test was not required to be performed. Therefore, based on management’s review, a goodwill impairment loss was not required for 2020. Historically, the Company has not recorded any goodwill impairment losses.

Long-Lived Assets

The Company reviews its long-lived assets, including property and equipment, operating lease right-of-use (“ROU”) assets, and amortizable intangible assets, for impairment whenever events or changes in circumstances indicate that the carrying amounts of the assets may not be fully recoverable. If the total of the expected undiscounted future net cash flows is less than the carrying amount of the long-lived asset being evaluated, a loss is recognized for any excess of the carrying amount over the fair value of the asset. The Company recognized impairment expense, included in indirect and selling expenses, of $3.1 million during the year ended December 31, 2020 related to certain ROU assets and $1.7 million during the year ended December 31, 2019 related to intangible assets associated with a historical business acquisition.

Leases

The Company determines if an arrangement is a lease at inception. Operating leases are included in operating lease ROU assets and operating lease liabilities (current and non-current) on the consolidated balance sheets. Operating lease ROU assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments as of the commencement date. Since most lease agreements do not provide an implicit rate, the Company uses its incremental borrowing rate as of the commencement date in estimating the present value of future payments. The operating lease ROU asset is based on the present value of future lease payments and excludes impacts from lease incentives and initial costs incurred to obtain the lease. At the lease commencement date, the Company estimates its collateralized incremental borrowing rate based on publicly available yields adjusted for Company-specific considerations and the Company's varying lease terms in determining the present value of future payments. Lease terms, for the purposes of determining each lease’s present value, include options to extend or terminate the lease if it is reasonably certain and economically reasonable that the Company will exercise that option. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term.

The Company uses leases to obtain use of a variety of different resources, including those for the use of facilities or equipment. These agreements may contain both lease and non-lease components, which are generally accounted for separately. For office equipment leases (primarily copier leases), the Company elected to account for the lease and non-lease components as a single lease component and not recognize ROU assets and lease liabilities for leases with a term not greater than twelve months.

Capitalized Software

The Company capitalizes certain costs to develop enhancements and upgrades to internal-use software that are incurred subsequent to the preliminary project stage. Amortization expense is recorded on a straight-line basis over the expected economic life of the software or the service contract, typically lasting three to five years. As of December 31, 2020, and 2019, capitalized software costs were not material to the Company’s consolidated financial statements.

Stock-based Compensation

The Company recognizes stock-based compensation expense related to share-based payments to employees, including grants of employee stock options, restricted stock awards, restricted stock units (“RSUs”), and cash-settled restricted stock units (“CSRSUs”) on a straight-line basis over the requisite service period, which is generally the vesting period. The Company recognizes expense for performance-based share awards (“PSAs”), which have both performance requirements and vesting conditions, on a straight-line basis over the three-year performance period. Non-employee director awards, which do not include vesting conditions, are for board-related services and therefore expensed when earned.

Stock-based compensation expense is based on the estimated fair value of the instruments on award and the estimated number of shares the Company ultimately expects will vest. The Company estimates the rate of future forfeitures based on factors which include the historical forfeiture experience for each applicable employee class under the assumption that the rate of future forfeitures will be similar to that experienced in the past. In addition, the estimation of PSAs that will ultimately vest requires judgment based on the performance and market conditions that will be achieved over the performance period. Changes to these estimates are recorded as a cumulative adjustment in the period estimates are revised.

The fair value of stock options, restricted stock awards, RSUs, PSAs, and non-employee director awards is estimated based on the fair value of a share of common stock at the grant date. The Company has elected to use the Black-Scholes-Merton option pricing model to determine the fair value of stock options. The fair value of PSAs is estimated using a Monte Carlo simulation model.

CSRSUs are settled only in cash payments. The cash payment is based on the fair value of the Company’s stock price at the vesting date, calculated by multiplying the number of CSRSUs vested by the Company’s closing stock price on the vesting date, subject to a maximum payment cap and a minimum payment floor. The Company treats these awards as liability-classified awards, and, therefore, accounts for them at fair value estimated based on the closing price of the Company’s stock at the reporting date.

Derivative Instruments

Derivative instruments designated as cash flow hedges are recorded on the consolidated balance sheets at fair value as of the reporting date, and the effective portion of the hedge is recorded in other comprehensive income (loss) on the consolidated statements of comprehensive income and reclassified to earnings in the period that the hedged instruments affect earnings. Management reviews the effectiveness of the hedges on a quarterly basis.

Income Taxes

The Company recognizes deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates in effect for the year in which those temporary differences are expected to be recovered or settled. The Company evaluates its ability to benefit from all deferred tax assets and establishes valuation allowances for amounts it believes will more likely than not be unrealizable. For uncertain tax positions, the Company uses a more-likely-than-not recognition threshold based on the technical merits of the income tax position taken. Income tax positions that meet the more-likely-than-not recognition threshold are measured in order to determine the tax benefit recognized in the financial statements. Penalties, if probable and reasonably estimable, and interest expense related to uncertain tax positions are not recognized as a component of income tax expense but recorded separately in indirect expenses and interest expense, respectively.

Treasury Shares

Treasury shares are accounted for under the cost method.

Other Comprehensive Income (Loss)

Other comprehensive income (loss) represents foreign currency translation adjustments arising from the use of differing exchange rates from period to period, the gain on the sale of an interest rate hedge agreement designated as a cash flow hedge, and the changes in fair value of interest rate agreements designated as cash flow hedges, net of taxes. The financial positions and results of operations of the Company’s foreign subsidiaries are based on the local currency as the functional currency and are translated to U.S. dollars for financial reporting purposes. Assets and liabilities of the subsidiaries are translated at the exchange rate in effect at each balance sheet date. Income statement accounts are translated at the average rate of exchange prevailing during the period. Translation adjustments are reported in accumulated other comprehensive loss included in stockholders’ equity in the Company’s consolidated balance sheets.

Segment, Customer and Geographic Information

The Company operates in one segment based on the consolidated information used by its chief operating decision maker in evaluating the financial performance of its business and allocating resources. This single segment represents the Company’s core business, which is providing professional services for government and commercial clients. Although the Company disaggregates its revenue by client market areas and type, the Company does not manage its business or allocate resources based on client market or type.

Approximately $667.0 million, $561.0 million, and $546.5 million of the Company’s revenue for the years 2020, 2019, and 2018, respectively, was derived under prime contracts and subcontracts with agencies and departments of the federal government representing 44%, 38%, and 41% of total revenue, respectively. No other customer accounted for 10% or more of the Company’s revenue during the years ended 2020, 2019, and 2018.

The Company’s international operations provide services to both commercial and international government clients. Revenue is attributed to a particular geographic area based on the administrative location of the client that awarded the contract. The Company’s revenue generated from international clients as a percentage of total revenue was approximately 13%, 8%, and 13% for the years 2020, 2019, and 2018, respectively.

At December 31, 2020 and 2019, long-lived assets held internationally were 15% and 17% of total long-lived assets, respectively.

Risks and Uncertainties

Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash and cash equivalents and contract receivables. The Company’s domestic bank accounts are insured up to $250,000 by the Federal Deposit Insurance Corporation. The majority of the Company’s cash transactions are processed through one U.S. commercial bank. Cash held domestically in excess of daily requirements is used to reduce any amounts outstanding under the Company’s Credit Facility. As of December 31, 2020 and 2019, the Company held approximately $81.5 million and $7.1 million, respectively, of cash and restricted cash in foreign bank accounts (not including outstanding deposits and checks). To date, the Company has not incurred losses related to cash and cash equivalents.

The Company’s receivables consist principally of amounts due from agencies and departments of the federal government, state and local governments, and international governments, as well as from commercial organizations. The credit risk, with respect to federal and other government clients, is limited due to the creditworthiness of the respective governmental entity. Amounts due for work performed as a subcontractor to a commercial organization also represent limited credit risk when the commercial client is performing as the prime contractor on a government contract due to the ultimate creditworthiness of the end client. Receivables from commercial clients generally pose a greater credit risk, and, as a result, are subject to ongoing monitoring. The Company extends credit in the normal course of operations and does not require collateral from its clients.

The Company has historically been, and continues to be, heavily dependent on contracts with the federal government which are subject to audit by agencies and departments of the federal government. Such audits determine, among other things, whether an adjustment to invoices previously rendered are required under regulations as well as the underlying terms of each respective contract. Management does not expect significant adjustments as a result of government audits that will adversely affect the Company’s financial position and results of operations.

Recent Accounting Pronouncements

Recent Accounting Pronouncements Adopted

Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract

In August 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2018-15, Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40). The standard aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is considered a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The standard also requires the entity to expense the capitalized implementation costs of a hosting arrangement over the term of the hosting arrangement and present the expense related to the capitalized implementation costs in the same line item in the statement of income as the fees associated with the hosting arrangement. The Company adopted the standard in the first quarter of 2020 and the standard was implemented using the prospective method. The Company’s adoption of ASU 2018-15 did not have a material impact on the consolidated financial statements.

Measurement of Credit Losses on Financial Instruments

In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses (Topic 326) – Measurement of Credit Losses on Financial Instruments. The standard, as amended, requires companies to measure credit losses by using a methodology that reflects the expected credit losses based on historical information, current economic conditions, and reasonable and supportable information. The Company adopted the standard in the first quarter of 2020 utilizing a modified-retrospective transition approach that required a cumulative-effect adjustment of $0.5 million to the opening retained earnings in the consolidated statement of stockholders’ equity as of the date of the adoption.

Recent Accounting Pronouncements Not Yet Adopted

Reference Rate Reform

In March 2020, FASB issued ASU 2020-04, Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The standard is intended to provide temporary optional expedients and exceptions to the U.S. GAAP guidance on contract modifications and hedge accounting to ease the financial reporting burdens related to the expected market transition from the London Interbank Offered Rate (“LIBOR”) and other interbank offered rates to alternative reference rates. The provisions of this ASU are elective and apply to all entities, subject to meeting certain criteria, that have debt or hedging contracts, among other contracts, that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. The Company can elect to not apply certain modification accounting requirements to contracts affected by reference rate reform, if certain criteria are met. Also, the Company can elect various optional expedients that would allow for the Company to continue to apply hedge accounting for hedging relationships affected by reference rate reform, if certain criteria are met. This guidance was effective beginning on March 12, 2020, and the Company may elect to apply the amendments prospectively through December 31, 2022. The Company is currently evaluating the impact of the transition from LIBOR to alternative reference interest rates but does not expect a significant impact to its operating results, financial position or cash flows.

Restricted Cash

12 Months Ended

Dec. 31, 2020

Cash And Cash Equivalents [Abstract]

Restricted Cash

NOTE 3 - RESTRICTED CASH

The following table provides a reconciliation of cash and cash equivalents, and restricted cash reported within the consolidated balance sheets at December 31, 2020 and 2019 to the total cash, cash equivalents, and restricted cash shown in the consolidated statements of cash flows for the years ended December 31, 2020, 2019, and 2018:

	2020				2019				2018
	Beginning		Ending		Beginning		Ending		Beginning		Ending
Cash and cash equivalents	$	6,482	$	13,841	$	11,694	$	6,482	$	11,809	$	11,694
Restricted cash - current ⁽¹⁾		—		68,146		—		—		11,191		—
Restricted cash - non-current		—		—		1,292		—		1,266		1,292
Total cash, cash equivalents, and restricted cash shown in the consolidated statement of cash flows	$	6,482	$	81,987	$	12,986	$	6,482	$	24,266	$	12,986

(1)	Restricted cash – current at the beginning of the year ended December 31, 2018 represents amounts held in an escrow account for the acquisition of The Future Customer (“TFC”).

Under a contract with a customer commencing in the final quarter of fiscal year 2020, the Company received advance payments to be used to pay providers of service to the customer, a separate third-party. The advanced payments are treated as restricted cash - current as the Company is required under the contract to distribute the advanced funds to the third-party providers or return the advanced funds to the customer. Because the Company receives the advance payments from the customer, which must be refunded to the customer or remitted to a third party, the cash receipts are treated as borrowings rather than receipts for the provision of goods or services. Therefore, these cash receipts are presented in the consolidated statement of cash flows as financing cash inflows, “receipt of restricted contract funds”, with the subsequent payments classified as financing cash outflows, “payment of restricted contract funds.” See Note 9 – Accrued Expenses and Other Liabilities for corresponding liability.

Contract Receivables

12 Months Ended

Dec. 31, 2020

Receivables [Abstract]

Contract Receivables

NOTE 4 - CONTRACT RECEIVABLES

Contract receivables consisted of the following:

	December 31, 2020			December 31, 2019
Billed receivables	$	230,466		$	264,682
Allowance for doubtful accounts		(7,616	)		(3,506	)
Contract receivables, net	$	222,850		$	261,176

Property and Equipment

12 Months Ended

Dec. 31, 2020

Property Plant And Equipment [Abstract]

Property and Equipment

NOTE 5 - PROPERTY AND EQUIPMENT

Property and equipment consisted of the following at December 31:

	2020			2019
Leasehold improvements	$	35,683		$	25,882
Software		53,001			52,343
Furniture and equipment		28,772			29,437
Computers		40,158			38,014
		157,614			145,676
Accumulated depreciation and amortization		(95,180	)		(87,439	)
Total property and equipment, net	$	62,434		$	58,237

Depreciation and amortization expense for the years ended December 31, 2020, 2019, and 2018, was approximately $20.4 million, $20.1 million, and $17.2 million, respectively.

Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2020

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

NOTE 6 - GOODWILL AND OTHER INTANGIBLE ASSETS

Goodwill

The changes in the carrying amount of goodwill for the fiscal years ended December 31 were as follows:

	2020		2019
Balance as of January 1	$	719,934	$	715,644
Goodwill resulting from business combination - ITG		188,253		—
Goodwill resulting from business combination - DMS Disaster Consultants		—		(50	)
Goodwill resulting from business combination - We Are Vista		—		(370	)
Goodwill resulting from business combination - Olson ⁽¹⁾		—		3,047
Effect of foreign currency translation		1,726		1,663
Balance as of December 31	$	909,913	$	719,934

In 2019, the Company recorded changes to goodwill representing an immaterial correction of an error for income tax balances related to acquired assets and liabilities from the business combination that occurred in 2014. These balances were not significant to our previously reported financial position.

Other Intangible Assets

Intangible assets with definite lives are primarily amortized over periods ranging from approximately 1 to 10 years. The weighted-average period of amortization for all intangible assets, calculated as of December 31, 2020, is 8.5 years. The customer-related intangible assets, which consist of customer contracts, backlog, and non-contractual customer relationships, are being amortized based on estimated cash flows and respective estimated economic benefit of the assets. The weighted-average period of amortization of the customer-related intangibles calculated as of December 31, 2020 is 8.5 years. Intangible assets related to developed technology are being amortized on an accelerated basis over a weighted-average period, calculated as of December 31, 2020, of 4.8 years. Intangible assets with an indefinite life consist of a domain name.

Other intangibles consisted of the following at December 31:

	2020
	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Customer-related	$	142,849	$	(83,137	)	$	59,712
Developed technology		733		(653	)		80
Total amortizable intangible assets		143,582		(83,790	)		59,792
Intangible with indefinite life		95		—			95
Total other intangible assets	$	143,677	$	(83,790	)	$	59,887

	2019
	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Customer-related	$	95,038	$	(69,425	)	$	25,613
Developed technology		733		(612	)		121
Total amortizable intangible assets		95,771		(70,037	)		25,734
Intangible with indefinite life		95		—			95
Total other intangible assets	$	95,866	$	(70,037	)	$	25,829

Aggregate amortization expense for the years ended December 31, 2020, 2019, and 2018, was approximately $13.3 million, $8.1 million, and $10.0 million, respectively. The Company recognized impairment expense, included in indirect and selling expense, of $1.7 million in the second quarter of 2019 related to the intangible asset associated with a historical business acquisition. The estimated future amortization expense relating to intangible assets is as follows:

Year ending December 31,
2021	$	12,049
2022		11,727
2023		11,339
2024		10,856
2025		6,904
Thereafter		6,917
Total	$	59,792

Leases

12 Months Ended

Dec. 31, 2020

Leases [Abstract]

Leases

NOTE 7 – LEASES

The Company has operating leases for facilities and equipment which have remaining terms ranging from 1 to 13 years. The leases may include options to extend the lease periods for up to 5 years at rates approximating market rates and/or options to terminate the leases within 1 year. The leases may include a residual value guarantee or a responsibility to return the property to its original state of use. A limited number of leases contain provisions that provide for rental increases based on consumer price indices. The change in rent expense resulting from changes in these indices are included within variable rent.

Operating leases consisted of the following at December 31, 2020:

	December 31, 2020
Real estate facilities	$	157,010
Office equipment		1,864
Other		580
		159,454
Amortization of right-of-use assets		(32,322	)
Total operating lease right-of-use assets	$	127,132

Rent expense is recognized on a straight-line basis over the lease term. Rent expense consists of the following:

	Year Ended December 31,
	2020		2019
Operating lease costs	$	37,874	$	36,210
Short-term lease costs		1,421		2,153
Variable lease costs		53		77
Total rent expense	$	39,348	$	38,440

Future minimum lease payments under non-cancellable leases as of December 31, 2020 were as follows:

			December 31, 2020
December 31, 2021			$	27,417
December 31, 2022				38,691
December 31, 2023				20,835
December 31, 2024				17,208
December 31, 2025				13,603
Thereafter				37,314
Total future minimum lease payments				155,068
Less: Interest				(16,104	)
Total operating lease liabilities			$	138,964

	December 31, 2020		December 31, 2019
Operating lease liabilities - current	$	23,350	$	32,500
Operating lease liabilities - non-current		115,614		119,250
Total operating lease liabilities	$	138,964	$	151,750

Other information related to operating leases is as follows:

	Year Ended December 31,
	2020			2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	41,025		$	36,907
Right-of-use assets obtained in exchange for new operating lease liabilities	$	29,790		$	31,123
Weighted-average remaining lease term - operating leases		5.9			5.1
Weighted-average discount rate - operating leases		3.4	%		3.7	%

As of December 31, 2020, the Company had an additional operating lease that had not yet commenced with a potential operating lease liability of $118.5 million. The operating lease has a lease term of 18 years and is anticipated to commence on March 2022 when the Company will take possession of the property and commence any required buildout.

Rent expense, for periods prior to the adoption of the new lease standard, is recognized on a straight-line basis over the lease term, net of sublease payments. Rent expense consists of the following for the year ended December 31:

	2018
Rent	$	34,924
Sublease income		(45	)
Total rent expense	$	34,879

Accrued Salaries and Benefits

12 Months Ended

Dec. 31, 2020

Accrued Salaries and Benefits

NOTE 8 - ACCRUED SALARIES AND BENEFITS

Accrued salaries and benefits consisted of the following at December 31:

	2020		2019
Accrued bonuses, liability-classified awards, and commissions	$	24,464	$	17,660
Accrued salaries		21,282		16,170
Accrued paid time off and leave		15,046		12,157
Social security tax deferral		10,457		—
Accrued medical		3,238		3,063
Accrued payroll taxes and withholdings		1,033		930
Other		4,992		2,150
Total accrued salaries and benefits	$	80,512	$	52,130

Accrued Expenses and Other Current Liabilities

12 Months Ended

Dec. 31, 2020

Payables And Accruals [Abstract]

Accrued Expenses and Other Current Liabilities

NOTE 9 - ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES

Accrued expenses and other current liabilities consisted of the following at December 31:

	2020		2019
Deposits	$	9,881	$	9,608
Restricted contract funds		68,138		—
Accrued IT and software licensing costs		2,157		3,983
Accrued taxes and insurance premiums		4,327		3,498
Accrued facilities rental and lease exit costs		780		1,223
Accrued interest		214		693
Accrued professional services		2,094		3,929
Accrued dividends		2,641		2,639
Contingent and contractual liabilities from acquisitions		683		2,700
Interest rate swap liability - current		3,693		1,069
Other accrued expenses and current liabilities		6,300		7,469
Total accrued expenses and other current liabilities	$	100,908	$	36,811

Long-Term Debt

12 Months Ended

Dec. 31, 2020

Debt Disclosure [Abstract]

Long-Term Debt

NOTE 10 - LONG-TERM DEBT

On March 3, 2020, the Company entered into the First Amendment (the “First Amendment”) to the Fifth Amended and Restated Business Loan and Security Agreement with a group of ten commercial banks (the “Credit Facility”). The First Amendment amended the Fifth Amended and Restated Business Loan and Security Agreement, entered into on May 17, 2017, to, among other things, (i) add a new term loan facility in the original principal amount of $200.0 million; (ii) increase the swing line commitment amount by $25.0 million to $75.0 million; (iii) extend the maturity date; and (iv) modify certain definitions and certain covenants. As a result, the Credit Facility now consists of (i) a term loan facility of $200.0 million; (ii) a revolving line of credit of up to $600.0 million with additional revolving credit commitments of up to $300.0 million, subject to lenders’ approval (the “Accordion”); and (iii) a sub-limit of $75.0 million for swing line loans. The Credit Facility matures on March 3, 2025.

The Company has the option to borrow funds under the Credit Facility at interest rates based on both LIBOR (1, 3, or 6-month rates) and the Base Rate (as defined herein), at its discretion, plus their applicable margins. Base Rates are fluctuating per annum rates of interest equal to the highest of (i) the Overnight Bank Funding Rate, plus 0.5%, (ii) the Prime Rate (as defined under the Credit Facility), and (iii) the daily LIBOR rate, plus a LIBOR margin of between 1.00% and 2.00% based on our Leverage Ratio (as defined under the Credit Facility. On December 31, 2020, our LIBOR based borrowing rate was 1.89%, including a LIBOR margin of 1.75%. The interest accrued based on LIBOR rates is to be paid on the last business day of the interest period (1, 3, or 6 months), while interest accrued based on the Base Rates is to be paid in quarterly installments. The Credit Facility provides for letters of credit aggregating up to $60.0 million which reduce the funds available under the Credit Facility when issued. The unused portion of the Credit Facility was subject to a commitment fee of between 0.13% and 0.25% per annum. Based on our Leverage Ratio that amount was 0.20% per annum at December 31, 2020 and 0.15% per annum at December 31, 2019.

The Credit Facility is collateralized by substantially all of the assets of the Company and requires that the Company remain in compliance with certain financial and non-financial covenants. The financial covenants require, among other things, that the Company maintain at all times an Interest Coverage Ratio (as defined under the Credit Facility) of not less than 3.00 to 1.00 and a Leverage Ratio of not more than 4.00 to 1.00 (subject to a step-up to 4.25 to 1.0 for a four quarter period following permitted acquisitions as defined under the Credit Facility) for each fiscal quarter. As of December 31, 2020, the Company had elected to step up its leverage ratio covenant and was in compliance with its covenants under the Credit Facility. The Credit Facility also has a conforming dividend covenant that allows the Company to pay dividends as long as we remain compliant within our covenants.

As of December 31, 2020, the available borrowing capacity under the Credit Facility (excluding the accordion) was $474.0 million. Taking into account the financial and performance-based limitations, the available borrowing capacity (excluding the accordion) was $276.1 million as of December 31, 2020.

As of December 31, 2020 and 2019, long-term debt consisted of the following:

	December 31, 2020				December 31, 2019
	Average Interest Rate	Outstanding Balance			Average Interest Rate	Outstanding Balance
Term Loan		$	192,500			$	—
Revolving Credit			123,281				165,444
Total before debt issuance costs	2.35%		315,781		3.59%		165,444
Unamortized debt issuance costs			(2,567	)			(1,183	)
		$	313,214			$	164,261

Current portion of long-term debt		$	10,000			$	—
Long-term debt - non-current			303,214				164,261
		$	313,214			$	164,261

Future scheduled repayments of term loan principal are as follows:

Payments due by	Term Loan		Revolving Credit		Total
December 31, 2021	$	10,000	$	—	$	10,000
December 31, 2022		10,000		—		10,000
December 31, 2023		13,750		—		13,750
December 31, 2024		15,000		—		15,000
December 31, 2025		143,750		123,281		267,031
Thereafter		—				—
Total	$	192,500	$	123,281	$	315,781

Debt Issuance Cost

The Company’s debt issuance costs are amortized over the term of indebtedness. The balance of net debt issuance costs at December 31, 2020 and 2019 are as follows:

	2020			2019
Amortizable debt issuance costs	$	8,751		$	6,921
Accumulated amortization		(6,184	)		(5,738	)
Net debt issuance costs	$	2,567		$	1,183

Amortization of debt issuance costs totaling $0.7 million, $0.5 million, and $0.5 million was recorded for each of the years ended December 31, 2020, 2019, and 2018, respectively, and was included as part of interest expense.

Letters of Credit

At December 31, 2020 and 2019, the Company had ten and nine outstanding letters of credit totaling approximately $2.7 million and $3.0 million, respectively. These letters of credit are renewed annually.

Revenue Recognition

12 Months Ended

Dec. 31, 2020

Revenue From Contract With Customer [Abstract]

Revenue Recognition

NOTE 11 – REVENUE RECOGNITION

Disaggregation of Revenue

The Company disaggregates revenue from clients, most of which is earned over time, into categories that depict how the nature, amount and uncertainty of revenue and cash flows are affected by economic factors. Those categories are client market, client type and contract mix. Client markets provide insight into the breadth of the Company’s expertise. In classifying revenue by client market, the Company attributes revenue from a client to the market that the Company believes is the client’s primary market. The Company also classifies revenue by the type of entity for which it does business, which is an indicator of the diversity of its client base. The Company attributes revenue generated as a subcontractor to a commercial company as government revenue when the ultimate client is a government agency or department. Disaggregation by contract mix provides insight in terms of the degree of performance risk that the Company has assumed. Fixed-price contracts are considered to provide the highest amount of performance risk as the Company is required to deliver a scope of work or level of effort for a negotiated fixed price. Time-and-materials contracts require the Company to provide skilled employees on contracts for negotiated fixed hourly rates. Since the Company is not required to deliver a scope of work, but merely skilled employees, it considers these contracts to be less risky than a fixed-price agreement. Cost-based contracts are considered to provide the lowest amount of performance risk since the Company is generally reimbursed for all contract costs incurred in performance of contract deliverables with only the amount of incentive or award fees (if applicable) dependent on the achievement of negotiated performance requirements.

	Year ended December 31,
	2020		2019		2018
Client Markets:
Energy, environment, and infrastructure	$	616,296	$	663,799	$	564,736
Health, education, and social programs		670,618		567,351		535,578
Safety and security		117,979		118,279		111,660
Consumer and financial		101,982		129,096		125,999
Total	$	1,506,875	$	1,478,525	$	1,337,973

	Year ended December 31,
	2020		2019		2018
Client Type:
U.S. federal government	$	666,961	$	560,953	$	546,050
U.S. state and local government		222,730		279,833		183,900
International government		95,734		122,125		122,186
Total Government		985,425		962,911		852,136
Commercial		521,450		515,614		485,837
Total	$	1,506,875	$	1,478,525	$	1,337,973

	Year ended December 31,
	2020		2019		2018
Contract Mix:
Time-and-materials	$	749,844	$	700,980	$	581,446
Fixed-price		529,157		566,299		526,751
Cost-based		227,874		211,246		229,776
Total	$	1,506,875	$	1,478,525	$	1,337,973

Contract Balances:

Contract assets consist primarily of unbilled amounts resulting from contracts when revenue recognized exceeds the amount billed due to billing schedule timing. Contract liabilities result from advance payments received on a contract or from billings in excess of revenue recognized on contracts due to billing schedule timing. The $3.6 million decrease in the Company’s net contract assets is due to a decline in international marketing services, which were impacted by COVID-19, and decreases in hurricane relief and rebuild work for U.S. state and local governments offset by an increase in U.S. federal government work, which are part of the contracts acquired under the ITG acquisition, and an increase in our international government work. There were no material changes to contract balances due to impairments or business combinations during the period. During the year ended December 31, 2020 and 2019, the Company recognized $24.7 million and $23.0 million in revenue related to the contract liabilities balance at December 31, 2019 and 2018, respectively.

	December 31, 2020			December 31, 2019			Change
Contract assets	$	143,369		$	142,337		$	1,032
Contract liabilities		(42,050	)		(37,413	)		(4,637	)
Net contract assets	$	101,319		$	104,924		$	(3,605	)

Performance Obligations:

The Company had $1.7 billion in unfulfilled performance obligations as of December 31, 2020, which primarily entail the future delivery of services for which revenue will be recognized over time. The obligations relate to continued or additional services required on contracts and were generally valued using an estimated cost-plus margin approach, with variable consideration being estimated at the most likely amount. The Company expects to satisfy these performance obligations, on average, in one to two years.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-URI http://asc.fasb.org/topic&trid=49130388

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

+ Details

Derivative instruments and Hedges Activities

12 Months Ended

Dec. 31, 2020

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivative instruments and Hedges Activities

NOTE 12 - DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

The Company uses interest rate swap arrangements (the “Swaps”) to manage or hedge its interest rate risk. Notwithstanding the terms of the Swaps, the Company is ultimately obligated for all amounts due and payable under the Credit Facility. The Company does not use such instruments for speculative or trading purposes.

The Company designated the Swaps as cash flow hedges. Derivative instruments are recorded on the consolidated balance sheets at fair value. Unrealized gains and losses on derivatives designated as cash flow hedges are reported in other comprehensive income (loss) (“AOCI”) and reclassified to earnings in a manner that matches the timing of the earnings impact of the hedged transactions. Management intends that the Swaps remain effective and, on a quarterly basis, evaluates them to determine their effectiveness or ineffectiveness and records the change in fair value as an adjustment to other comprehensive income or loss.

On February 20, 2020, the Company entered into a floating-to-fixed interest rate swap for an aggregate notional amount of $100.0 million to hedge a portion of the Company’s variable rate indebtedness. The Company designated the swap as a cash flow hedge. The swap requires the Company to pay a fixed rate of 1.294% per annum on the notional amount starting on February 28, 2020 to February 28, 2025. The floating-to-fixed interest rate settles monthly during the period of the cash flows and the realized gains and losses from the swap are recognized as a component of interest expense.

A summary of Swaps designated as cash flow hedges as of December 31, 2020 are as follows:

			Dates of Effected Cash Flows
Date of Interest Rate Swap Agreement	Notional Amount ($million)	Paid Fixed Interest Rate%	Beginning	Ending
September 30, 2016 ⁽¹⁾	$100.0	-	January 31, 2018	January 31, 2023
August 31, 2017	$25.0	1.8475%	August 31, 2018	August 31, 2023
August 8, 2018	$50.0	2.8540%	August 31, 2018	August 31, 2023
August 8, 2018	$25.0	2.8510%	August 31, 2018	August 31, 2023
February 20, 2020	$100.0	1.2940%	February 28, 2020	February 28, 2025

(1)

On December 1, 2016, the Company sold the interest rate hedge agreement. The fair value of the interest rate hedge, as of the date of the sale, was recorded in other comprehensive income, net of tax. The gain from the sale will be recognized into earnings when earnings are impacted by the cash flows of the previously hedged variable interest rate.

For the years ended December 31, 2020 and 2019, the effect of the Swaps on the Company’s financial statements are as follows:

Cash Flow Hedging Derivatives

Total Gain or (Loss) Recorded to

AOCI

Amount of (Gain) or Loss

Reclassified from AOCI into

Income

2020

2019

2020

2019

Interest Rate Swaps

(9,867

)

(3,362

)

2,031

(387

)

As of December 31, 2020, the net amount of realized losses from the hedge agreements expected to be reclassified from AOCI into earnings within the next 12 months is $3.0 million.

Income Taxes

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Income Taxes

NOTE 13 - INCOME TAXES

The domestic and foreign components of income before provision for income taxes are as follows for the years ended December 31:

	2020		2019		2018
Domestic	$	68,817	$	87,622	$	74,479
Foreign		5,856		2,551		8,348
Income before income taxes	$	74,673	$	90,173	$	82,827

Income tax expense consisted of the following for the years ended December 31:

	2020			2019			2018
Current:
Federal	$	14,645		$	14,123		$	9,700
State		5,198			5,698			4,035
Foreign		1,736			1,537			2,418
Total current		21,579			21,358			16,153
Deferred:
Federal		(1,721	)		320			4,072
State		314			(25	)		1,452
Foreign		(458	)		(418	)		(250	)
Total deferred		(1,865	)		(123	)		5,274
Income tax expense	$	19,714		$	21,235		$	21,427

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and income tax purposes.

Deferred tax assets (liabilities) consisted of the following at December 31:

	2020			2019
Deferred Tax Assets
Allowance for bad debt	$	1,687		$	888
Accrued paid time off		2,423			1,671
Foreign net operating loss (NOL) carry forward		957			866
State net operating loss (NOL) carry forward		714			714
Stock option compensation		2,308			2,666
Deferred rent		3,091			3,129
Deferred compensation		4,598			3,902
Foreign tax credits		5,882			4,508
State tax credits		2,108			2,026
Foreign exchange		5,370			3,579
Foreign deferred		650			200
Accrued bonus		4,126			884
Accrued liabilities and other		5,701			4,434
		39,615			29,467
Less: Valuation Allowance		(6,839	)		(5,374	)
Total Deferred Tax Assets		32,776			24,093

Deferred Tax Liabilities
Retention		(1,003	)		(1,395	)
Prepaid expenses		(1,089	)		(1,451	)
Payroll taxes		(489	)		(593	)
Unbilled revenue		(1,451	)		(2,691	)
Depreciation		(1,731	)		(3,112	)
Amortization		(60,392	)		(52,076	)
Deferred gain and other		(951	)		(396	)
Total Deferred Tax Liabilities		(67,106	)		(61,714	)
Total Net Deferred Tax Liability	$	(34,330	)	$	(37,621	)

On December 20, 2017, the U.S. Congress passed the Tax Cuts and Job Act of 2017 (the “Tax Act”), which was signed into law on December 22, 2017 and is generally effective beginning January 1, 2018. The Company was impacted in several ways as a result of the Tax Act, including, but not limited to, provisions which include a permanent reduction in the U.S. federal corporate income tax rate from 35% to 21%, the revaluation of deferred tax assets and liabilities required as a result of the tax rate change and the application of a mandatory one-time “transition tax” on unremitted earnings of certain foreign subsidiaries that were previously tax deferred.

Pursuant to U.S. Securities and Exchange Commission Staff Accounting Bulletin 118 (“SAB 118”), the Company completed its accounting for the tax effects of enactment of the Tax Act and refined its provisional estimates during the measurement period ended December 22, 2018. The Company recorded its adjustments to both the provisional estimate of the effects on existing deferred tax balances and the one-time transition tax in the period of enactment. The Company recognized the adjustments to the provisional estimate of the transition tax as a decrease in the provision for income taxes. The provisional amount recorded related to the re-measurement of the deferred tax balances was adjusted as an increase in the provision for income taxes, including adjustments to valuation allowances, of approximately $1.0 million.

The Company re-measured certain deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future, which is now generally 26.4%.

As of December 31, 2020, the cumulative foreign tax credit carryforward balance increased by approximately $1.4 million and the valuation allowance required increased by approximately $1.4 million. No additional income taxes have been provided for on any remaining undistributed foreign earnings not subject to the transition tax. No additional deferred income taxes have been provided for the $0.1 million of additional favorable outside basis differences inherent in these foreign entities as of December 31, 2020 because these amounts continue to be permanently reinvested in foreign operations.

As of December 31, 2020 and 2019, the Company had approximately $2.5 million of foreign operating loss carryforward for income taxes which may be carried forward indefinitely.

As of December 31, 2020, the Company had NOL carryforwards for state income tax purposes of approximately $7.8 million, which expires in 2034. The Company acquired these NOLs as a result of its purchase of Olson in November 2014. Internal Revenue Code Section 382 imposes an annual limitation on the use of a corporation’s NOLs, tax credits and other carryovers after an “ownership change” occurs. Section 382 imposes an annual limitation on the amount of post-ownership change taxable income a corporation may offset with pre-ownership change NOLs and credits. In general, the annual limitation is determined by multiplying the value of the corporation’s stock immediately before the ownership change (subject to certain adjustments) by the applicable long-term tax-exempt rate. Any unused portion of the annual limitation is available for use in future years until such NOLs are scheduled to expire (in general, NOLs may be carried forward 20 years). The Company presently estimates that it will be able to fully utilize the remaining acquired NOLs prior to their expiration.

As of December 31, 2020, the Company had gross state income tax credit carryforwards of approximately $2.7 million, which expire between 2021 and 2029. A deferred tax asset of approximately $2.1 million, net of federal benefit, has been established related to these state income tax credit carryforwards as of December 31, 2020.

The need to establish valuation allowances for deferred assets is based on a more-likely-than-not threshold that the benefit of such assets will be realized in future periods. Appropriate consideration has been given to all available evidence, including historical operating results, projections of taxable income, and tax planning alternatives. The Company concluded that a valuation allowance of approximately $1.0 million and $0.9 million was required for tax attributes related to specified foreign jurisdictions as of December 31, 2020 and 2019, respectively, and an additional $5.8 million valuation allowance is required against our U.S. foreign tax credit carry forwards.

The total amount of unrecognized tax benefits as of December 31, 2020 was $0.8 million, which includes $0.8 million of tax positions that, if recognized, would impact the effective rate. There were no unrecognized tax benefits as of December 31, 2019.

The unrecognized tax benefit reconciliation, excluding penalty and interest, is as follows:

Unrecognized tax benefits at January 1, 2018	$	820
Increase attributable to tax positions taken during the current period		216
Decrease attributable to settlements with taxing authorities		(37	)
Decrease attributable to lapse of statute of limitations		(783	)
Unrecognized tax benefits at December 31, 2018		216
Decrease attributable to tax positions taken during a prior period		(216	)
Unrecognized tax benefits at December 31, 2019		—
Increase attributable to tax positions taken during the current period		811
Unrecognized tax benefits at December 31, 2020	$	811

The Company’s policy is not to recognize accrued interest and penalties related to unrecognized tax benefits as a component of tax expense. The Company had approximately $0.1 million accrued penalty and interest at December 31, 2020. The Company did not have any accrued penalty and interest at December 31, 2019

The Company’s 2017 to 2019 tax years remain subject to examination by the Internal Revenue Service for federal tax purposes. Certain significant state and foreign tax jurisdictions are also either currently under examination or remain open under the statutes of limitation and subject to examination for the tax years from 2016 to 2019.

Although the Company believes it has adequately provided for all uncertain tax positions, amounts asserted by taxing authorities could be greater than the Company’s accrued position. Accordingly, additional provisions on federal, state and foreign income tax related matters could be recorded in the future as revised estimates are made or the underlying matters are effectively settled or otherwise resolved. Conversely, the Company could settle positions with the tax authorities for amounts lower than have been accrued. The Company believes it is reasonably possible that, during the next 12 months, the Company’s liability for uncertain tax positions may not change.

The Company’s provision for income taxes differs from the federal statutory rate. The differences between the statutory rate and the Company’s provision are as follows:

	2020			2019			2018
Taxes at statutory rate		21.0	%		21.0	%		21.0	%
State taxes, net of federal benefit		5.6	%		5.3	%		5.2	%
Foreign tax rate differential		0.3	%		0.3	%		0.5	%
Executive compensation		2.4	%		0.6	%		1.0	%
Other permanent differences		0.1	%		0.7	%		0.8	%
Prior year tax adjustments		(1.1	)%		(1.0	)%		0.2	%
Unrecognized tax benefits		1.0	%		(0.2	)%		(0.6	)%
Valuation allowance		1.6	%		1.1	%		1.3	%
Equity-based compensation		(3.8	)%		(3.6	)%		(3.0	)%
Tax credits		(0.7	)%		(0.6	)%		(0.5	)%
Taxes at effective rate		26.4	%		23.6	%		25.9	%

In response to the COVID-19 pandemic, the U.S. federal, state and local governments, as well as numerous foreign governments, have enacted tax-related relief programs to provide both direct and indirect tax assistance in the form of tax subsidies, exemptions, deferrals and credits. The Company is continuously analyzing these programs as they are introduced in order to determine its eligibility and the risks and benefits of participation. During the year ended December 31, 2020, the Company elected to participate in several COVID-19 tax-relief programs for which it was eligible

Pursuant to the Coronavirus Aid, Relief and Economic Security (“CARES”) Act, the Company exercised the option to defer payment of the employer portion of the Social Security tax, with 50% to be repaid by December 31, 2021 and the remainder by December 31, 2022. The Company deferred payment of approximately $20.9 million of employer Social Security taxes during the year ended December 31, 2020. As of December 31, 2020, the current portion of the deferred payments are included in accrued salaries and benefits, and the remaining deferred payments are included in other long-term liabilities in the Company’s consolidated balance sheet. We are currently participating in several international government subsidy programs, providing approximately $3.0 million as of December 31, 2020, whose objective is to encourage eligible companies to keep employees on the payroll during the COVID-19 pandemic. A requirement of these subsidies is that we continue to employ the identified employees who might otherwise have been impacted by a reaction to COVID-19. The subsidies are limited in the amount and time in which payroll costs are covered.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References + Details

Accumulated Other Comprehensive Loss

12 Months Ended

Dec. 31, 2020

Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]

Accumulated Other Comprehensive Loss

NOTE 14 - ACCUMULATED OTHER COMPREHENSIVE LOSS

Accumulated other comprehensive loss included the following:

	Foreign Currency Translation Adjustments			Gain on Sale of Interest Rate Hedge Agreement ⁽¹⁾			Changes in Fair Value of Interest Rate Hedge Agreements ⁽²⁾⁽⁵⁾			Total
Accumulated other comprehensive (loss) income at January 1, 2018	$	(7,638	)	$	2,158		$	441		$	(5,039	)
Reclassification of stranded tax effects due to adoption of accounting principle ⁽⁶⁾		(1,307	)		478			—			(829	)
Adjusted beginning balance		(8,945	)		2,636			441			(5,868	)
Current period other comprehensive (loss) income:
Other comprehensive loss before reclassifications		(4,711	)		—			(1,184	)		(5,895	)
Amounts reclassified from accumulated other comprehensive income		—			(660	)		(12	)		(672	)
Effect of taxes ⁽³⁾		(512	)		188			208			(116	)
Total current period other comprehensive loss		(5,223	)		(472	)		(988	)		(6,683	)
Accumulated other comprehensive (loss) income at December 31, 2018		(14,168	)		2,164			(547	)		(12,551	)
Other comprehensive income (loss) before reclassifications		2,338			—			(3,362	)		(1,024	)
Amounts reclassified from accumulated other comprehensive income		—			(720	)		333			(387	)
Effect of taxes ⁽³⁾		835			190			793			1,818
Total current period other comprehensive income (loss)		3,173			(530	)		(2,236	)		407
Accumulated other comprehensive (loss) income at December 31, 2019		(10,995	)		1,634			(2,783	)		(12,144	)
Other comprehensive income (loss) before reclassifications		4,141			—			(9,867	)		(5,726	)
Amounts reclassified from accumulated other comprehensive income ⁽⁴⁾		—			(720	)		2,751			2,031
Effect of taxes ⁽³⁾		(356	)		182			1,907			1,733
Total current period other comprehensive income (loss)		3,785			(538	)		(5,209	)		(1,962	)
Accumulated other comprehensive (loss) income at December 31, 2020	$	(7,210	)	$	1,096		$	(7,992	)	$	(14,106	)

(1)

Represents the fair value of an interest rate hedge agreement, designated as a cash flow hedge, which was sold on December 1, 2016. The fair value of the interest rate hedge agreement was recorded in other comprehensive income, net of tax, and will be reclassified to earnings when earnings are impacted by the hedged items, as interest payments are made on the Credit Facility from January 31, 2018 to January 31, 2023.

(2)

Represents the change in fair value of an interest rate hedge agreements designated as a cash flow hedges. The fair value of the interest rate hedge agreement was recorded in other comprehensive income and will be reclassified to earnings when earnings are impacted by the hedged items, as interest payments are made on the Credit Facility from August 31, 2018 to February 28, 2025. See additional details of the hedge agreements in Note 12 - Derivative Instruments and Hedging Activities.

(3)	The Company’s effective tax rate for the years ended December 31, 2020, 2019, and 2018 was 26.4%, 23.6%, and 25.9%, respectively.

(4)	The Company expects to reclassify $0.7 million related to the Gain on Sale of Interest Rate Hedge Agreement, and $3.7 million losses related to the Change in Fair Value of Interest Rate Hedge Agreement from accumulated other comprehensive loss into earnings during the next 12 months.

(5)	The fair value of the interest rate hedge agreements is included in other current and other long-term liabilities on the consolidated balance sheet.

(6)	The Company has adjusted the balance of accumulated other comprehensive (loss) income at December 3, 2017 after the adoption of ASU 2018-02.

Accounting for Stock-based Compensation

12 Months Ended

Dec. 31, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Accounting for Stock-based Compensation

NOTE 15 - ACCOUNTING FOR STOCK-BASED COMPENSATION

Stock Incentive Plans

On April 4, 2018, the Company’s board of directors approved the 2018 Omnibus Incentive Plan (the “2018 Omnibus Plan”), which was subsequently approved by the stockholders and became effective on May 31, 2018 (the “Effective Date”). The 2018 Omnibus Plan replaced the previous 2010 Omnibus Incentive Plan (the “Prior Plan”). The 2018 Omnibus Plan was amended on May 28, 2020 to increase the number of shares available for issuance.

The 2018 Omnibus Plan, as amended, allows the Company to grant 1,600,000 shares using stock options, stock appreciation rights, restricted stock, RSUs, performance units and PSAs, cash-based awards, and other stock-based awards to all key officers, key employees, and non-employee directors of the Company. Outstanding grants under the Prior Plan, totaling 90,742, remain subject to their terms and conditions, and no additional awards from the Prior Plan are to be made after the Effective Date. As of December 31, 2020, the Company had approximately 1,107,968 shares available to grant under the 2018 Omnibus Plan. CSRSUs have no impact on the shares available for grant under the 2018 Omnibus Plan and have no impact on the calculated shares used in earnings per share (“EPS”) calculations.

The total stock-based compensation expense for the years ended December 31, 2020, 2019, and 2018, the unrecognized compensation expense at December 31, 2020, and the weighted-average period to recognize the remaining unrecognized shares are as follows:

	Stock-Based Compensation Expense
	Recognized as of December 31,						Unrecognized
	2020		2019		2018		December 31, 2020		Weighted Average Period to Recognize (years)
Restricted Stock Units	$	11,895	$	10,644	$	7,410	$	10,777		1.7
Cash-Settled Restricted Stock Units		7,015		10,213		8,214		8,688		1.5
Non-Employee Director Awards		755		719		764		383		0.4
Performance Shares		4,905		4,455		3,193		2,229		1.5
Total	$	24,570	$	26,031	$	19,581	$	22,077

The assumptions of employment termination forfeiture rates used in the determination of fair value of stock awards during the 2020 calendar year were based on the Company’s historical average of actual forfeitures from the previous 10 years preceding the reporting period. The expected annualized forfeiture rates used during the 2020 calendar year varied from 0% to 17.75%, and the Company does not expect these termination rates to vary significantly in the future.

Stock Options

Option awards are granted with an exercise price equal to the market value of the Company’s common stock on the date of grant. All options outstanding as of December 31, 2020 have a 10-year contractual term. Options generally have a vesting term of three or four years. There were no option awards granted during 2020, 2019, and 2018.

The following table summarizes the changes in outstanding stock options:

	Number of Shares			Weighted Average Exercise Price		Aggregate Intrinsic Value
Outstanding at January 1, 2018		411,498		$	30.71
Exercised		(209,688	)	$	27.86
Granted		—		$	—
Forfeited/Expired		—		$	—
Outstanding at December 31, 2018		201,810		$	33.68
Exercised		(93,682	)	$	31.21
Granted		—		$	—
Forfeited/Expired		—		$	—
Outstanding at December 31, 2019		108,128		$	35.82
Exercised		(69,901	)	$	37.94
Granted		—		$	—
Forfeited/Expired		—		$	—
Outstanding at December 31, 2020		38,227		$	31.93	$	1,620,688
Vested plus expected to vest at December 31, 2020		38,227		$	31.93	$	1,620,688
Exercisable at December 31, 2020		38,227		$	31.93	$	1,620,688

The aggregate intrinsic value in the preceding table is based on the Company’s closing stock price of $74.33 as of December 31, 2020. The total intrinsic value of options exercised was $5.1 million, $4.9 million, and $8.3 million for the years ended December 31, 2020, 2019, and 2018, respectively. All options were vested prior to December 31, 2018. As of December 31, 2020, the weighted-average remaining contractual term for options vested was 2.3 years and for exercisable options was 2.3 years.

Information regarding stock options outstanding as of December 31, 2020 is summarized below:

	OPTIONS OUTSTANDING						OPTIONS EXERCISABLE
Range of Exercise Prices	Number Outstanding As of December 31, 2020		Weighted Average Remaining Contractual Term		Weighted Average Exercise Price		Number Exercisable As of December 31, 2020		Weighted Average Exercise Price
$21.77 to $25.00		1,915		0.3	$	21.77		1,915	$	21.77
$25.01 to $27.00		6,332		1.2	$	25.66		6,332	$	25.66
$27.01 to $40.00		14,874		2.2	$	27.03		14,874	$	27.03
$40.01 to $41.00		15,106		3.2	$	40.68		15,106	$	40.68
$21.77 to $41.00		38,227		2.3	$	—		38,227	$	31.93

Restricted Stock Units

RSUs generally have a vesting term of three to four years. On vesting the employee is issued one share of stock for each RSU awarded. The fair value of shares vested was $14.1 million, $7.2 million, and $6.5 million for the years ended December 31, 2020, 2019, and 2018, respectively.

A summary of the Company’s RSUs is presented below.

	Number of Shares			Weighted- Average Grant Date Fair Value		Aggregate Intrinsic Value
Non-vested RSUs at January 1, 2018		463,587		$	38.71
Granted		235,480		$	65.37
Vested		(169,279	)	$	38.66
Cancelled		(55,548	)	$	47.50
Non-vested RSUs at December 31, 2018		474,240		$	50.93
Granted		159,831		$	77.74
Vested		(164,913	)	$	43.82
Cancelled		(19,183	)	$	56.18
Non-vested RSUs at December 31, 2019		449,975		$	62.48
Granted		170,411		$	58.27
Vested		(258,307	)	$	54.73
Cancelled		(56,680	)	$	63.46
Non-vested RSUs at December 31, 2020		305,399		$	66.51	$	22,700,308
RSUs expected to vest in the future		279,087		$	66.69	$	20,744,537

The aggregate intrinsic value in the preceding table is based on the Company’s closing stock price of $74.33 per share as of December 31, 2020.

Cash-Settled Restricted Stock Units

CSRSUs generally have a vesting term of three to four years. A summary of the Company’s CSRSUs is presented below.

	Number of Shares			Weighted- Average Grant Date Fair Value		Aggregate Intrinsic Value
Non-vested CSRSUs at January 1, 2018		391,916		$	38.80
Granted		147,103		$	60.84
Vested		(147,759	)	$	38.71
Cancelled		(53,854	)	$	43.07
Non-vested CSRSUs at December 31, 2018		337,406		$	47.73
Granted		103,606		$	77.03
Vested		(123,395	)	$	44.61
Cancelled		(21,384	)	$	53.99
Non-vested CSRSUs at December 31, 2019		296,233		$	58.83
Granted		134,259		$	60.30
Vested		(154,653	)	$	49.44
Cancelled		(34,358	)	$	63.03
Non-vested CSRSUs at December 31, 2020		241,481		$	65.06	$	17,949,283
CSRSUs expected to vest in the future		213,305		$	65.17	$	15,854,961

The aggregate intrinsic value in the preceding table is based on the Company’s closing stock price of $74.33 per share as of December 31, 2020. The fair value of CSRSUs vested and settled in cash for the years ended December 31, 2020, 2019, and 2018 was $9.3 million, $7.2 million and $7.7 million, respectively.

Non-Employee Director Awards

In the first six months of 2018, the Company granted awards of unregistered shares to its non-employee directors on a quarterly basis under its annual equity election plan. The awards were issued from the Company’s treasury stock and had no impact on the shares available for grant under the 2018 Omnibus Plan or the Prior Plan.

A summary of the Company’s non-employee director awards of unregistered shares granted by fiscal year is presented below.

For the Year ended December 31,

Number of

Granted

Weighted-

Average Grant

Date Fair Value

2018

7,985

60.36

Beginning on July 2, 2018, the Company granted awards of registered shares to its non-employee directors on an annual basis under the Omnibus Plan. A summary of the non-employee director awards is presented below:

	Number of Shares			Weighted- Average Grant Date Fair Value		Aggregate Intrinsic Value
Non-vested RSUs at July 1, 2018		—		$	—
Granted		11,606		$	72.35
Vested		(5,395	)	$	72.35
Cancelled		(1,243	)	$	72.35
Non-vested RSUs at December 31, 2018		4,968		$	72.35
Granted		9,732		$	73.94
Vested		(9,840	)	$	73.14
Cancelled		—		$	—
Non-vested RSUs at December 31, 2019		4,860		$	73.94
Granted		12,541		$	64.58
Vested		(10,891	)	$	68.82
Cancelled		—		$	—
Non-vested RSUs at December 31, 2020		6,510		$	64.47	$	483,888
RSUs expected to vest in the future		6,510		$	64.47	$	483,888

The aggregate intrinsic value in the preceding table is based on the Company’s closing stock price of $74.33 per share as of December 31, 2020.

Performance Share Awards

In 2015, the Company’s Board of Directors approved a performance-based share program (the “Program”) that provides for the issuance of PSAs to its senior management. Under the Program, the number of PSAs that the participant will receive depends on the Company’s achievement of two performance goals during two performance periods. The performance goals under the Program are based on (i) the Company’s compounded annual growth rate in EPS during a two-year performance period and (ii) the Company’s cumulative total shareholder return (“rTSR”) relative to its peer group during a performance period from the first day of the performance period (typically January 1 of the year awarded) to the last day of the third year of the performance period (typically December 31). The PSAs will only be eligible to vest following the expiration of the three-year performance period. Actual shares vested will be subject to both continued employment by the Company (barring certain exceptions allowing for partial performance periods) and actual financial measures achieved. The actual number of shares of common stock that will be issued to each participant at the end of the applicable performance period will be determined by multiplying the award by the product of two percentages, one based on the Company’s EPS performance and a second one based on the Company’s rTSR performance, subject to a minimum and maximum performance level. As of December 31, 2020, shares granted during 2018, 2019, and 2020 are within year three, two, and one of the performance period, respectively, and therefore have not fully vested. A total of 88,038 shares granted in 2017 vested during 2020 after meeting the performance goals, and a total of 94,178 shares (adjusted for partial performance periods) granted in 2018, 2019, and 2020 is expected to vest in the future.

A summary of the Company’s PSAs is presented below.

	Number of Shares			Weighted- Average Grant Date Fair Value		Aggregate Intrinsic Value
Non-vested PSAs at January 1, 2018		187,022		$	39.95
Granted		45,136		$	65.05
Vested		(30,576	)	$	44.21
Cancelled		(32,096	)	$	43.72
Non-vested PSAs at December 31, 2018		169,486		$	45.15
Granted		85,928		$	62.07
Vested		(107,000	)	$	37.21
Cancelled		—		$	—
Non-vested PSAs at December 31, 2019		148,414		$	60.67
Granted		87,314		$	51.44
Vested		(88,038	)	$	38.81
Cancelled		(5,569	)	$	69.66
Non-vested PSAs at December 31, 2020		142,121		$	68.19	$	10,563,854
PSAs expected to vest in the future		94,178		$	69.76	$	7,000,251

The aggregate intrinsic value in the preceding table is based on the Company’s closing stock price of $74.33 per share as of December 31, 2020. The fair value of the awards is estimated on the grant date using a Monte Carlo simulation model due to the market condition for the rTSR component. The fair value assumptions using the Monte Carlo simulation model for awards granted in 2020, 2019, and 2018 were:

	2020			2019			2018
Dividend Yield		1.0	%		0.7	%		0.9	%
Historical Volatility		35.7	%		29.3	%		31.9	%
Risk-Free Rate of Returns		0.4	%		2.4	%		2.4	%

Business Combinations

12 Months Ended

Dec. 31, 2020

Business Combinations [Abstract]

Business Combinations

NOTE 16 – BUSINESS COMBINATIONS

In January 2018, the Company acquired TFC, a leading boutique loyalty strategy and marketing company based in London, U.K. The acquisition of TFC enhanced and extended the Company’s customer loyalty business to Europe.

In August 2018, the Company acquired DMS Disaster Consultants (“DMS”), a disaster management and recovery firm based in Florida, to broaden its capabilities in support of assisting communities, businesses and individuals recover from man-made and nature disasters. DMS assists public sector clients with man-made and natural disaster planning and preparedness, and post-disaster response and recovery efforts by assisting clients in obtaining funding from the Federal Emergency Management Agency, insurance companies, and other sources.

In October 2018, the Company acquired We Are Vista (“Vista”), a communications company headquartered in Leeds, U.K., with an additional presence in London. Vista provides advisory services and solutions to clients in the financial, retail, automobile, and energy industries and broadens the Company’s capabilities in the region.

On January 31, 2020, the Company acquired all of the membership interests in Incentive Technology Group, LLC (“ITG”), a Virginia limited liability company, for the purchase price of $255.0 million (subject to post-closing and working capital adjustments). Headquartered in Arlington, Virginia, ITG is an information technology consulting firm that provides cloud-based platform services to the federal government. The acquisition is expected to augment the Company’s federal government business. The acquisition of ITG includes provisions that adjust the consideration transferred for excesses or shortfalls in the stipulated amount of working capital as of the acquisition date, as defined.

The acquisition was accounted for under the purchase method. The preliminary allocation of the total purchase price to the tangible and intangible assets and liabilities of ITG is based on management’s preliminary estimate of fair value as of the acquisition date and is subject to revision until the purchase price adjustments and valuations of intangible assets and goodwill are finalized. The Company engaged an independent valuation firm to assist management in the allocation of the purchase price to goodwill and to other acquired intangible assets. The excess of the purchase price over the estimated fair value of the net tangible assets acquired was approximately $235.6 million. The Company has allocated approximately $188.3 million to goodwill and $47.3 million to other intangible assets. The goodwill recorded as part of the acquisition primarily reflects the value of providing an established platform to leverage the Company’s existing digital interactive technologies and domain expertise, synergies expected to arise from providing end-to-end customer solutions to a combined client-base across all channels, as well as any intangible assets that do not qualify for separate recognition. The ITG acquisition is treated as a deemed asset purchase for income tax purposes; therefore, goodwill and amortization of other intangibles created via this acquisition will be amortized for income tax purposes over 15 years.

In December 2020, the Company completed the acquisition of Eco-Tech Consultants, Inc (“Eco-Tech”), is an ecological consulting firm located in Louisville, Kentucky. The firm provides a range of ecological services across the Eastern United States and will greatly increase the Company’s capacity to support a growing portfolio of transportation agency clients in the eastern United States.

A prior acquisition’s purchase agreement included additional consideration in the form of two warranty and indemnity hold back payments, one for approximately $1.9 million, which was released in the second quarter of 2020, and the other for approximately $1.2 million scheduled to be released in the fourth quarter of 2022. The two warranty and indemnity liabilities were recorded at their fair value at the date of the acquisition discounting the liabilities at 3.0% and 3.25%, respectively.

Separately or in the aggregate, the acquisitions were not significant to the Company’s financial statements taken as a whole.

Earnings Per Share

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Earnings Per Share

NOTE 17 - EARNINGS PER SHARE

EPS is computed by dividing reported net income by the weighted-average number of shares outstanding. Diluted EPS considers the potential dilution that could occur if common stock equivalents of stock options, RSUs, and PSAs were exercised or converted into stock. PSAs are included in the computation of diluted shares only to the extent that the underlying performance conditions (i) are satisfied as of the end of the reporting period or (ii) would be considered satisfied if the end of the reporting period were the end of the related performance period and the result would be dilutive under the treasury stock method. For the years ended December 31, 2020, 2019, and 2018, there were 1,879 weighted-average shares, 2,822 weighted-average shares, and 20,291 weighted-average shares, respectively, excluded from the calculation of EPS because they were anti-dilutive. The anti-dilutive shares were primarily RSUs.

The dilutive effect of stock options, RSUs, and performance shares for each period reported is summarized below:

	2020		2019		2018
Basic weighted-average shares outstanding		18,841		18,816		18,797
Effect of potential exercise of stock options, RSUs, and PSAs		294		408		538
Diluted weighted-average shares outstanding		19,135		19,224		19,335

Share Repurchase Program

12 Months Ended

Dec. 31, 2020

Equity [Abstract]

Share Repurchase Program

NOTE 18 - SHARE REPURCHASE PROGRAM

The Company’s share repurchase program allows for share repurchases in the aggregate up to $100.0 million under share repurchase plans approved by the board of directors pursuant to Rules 10b5-1 and 10b-18 under the Securities Exchange Act of 1934, as amended. On March 13, 2020, the Company terminated the Rule 10b5-1 plan element of the share repurchase program. The Company subsequently approved an updated Rule 10b5-1 plan element of the share repurchase program, as part of its normal process, that is scheduled to commence January 2021 The Credit Facility permits unlimited share repurchases, provided the Company’s Leverage Ratio, prior to and after giving effect to such repurchases, is not greater than 3.50 to 1.00.

Purchases under this program may be made from time to time at prevailing market prices in open market purchases or in privately negotiated transactions pursuant to Rule 10b-18 under the Exchange Act and in accordance with applicable insider trading and other securities laws and regulations. The purchases are funded from existing cash balances and/or borrowings, and the repurchased shares are held in treasury and used for general corporate purposes. The timing and extent to which the Company repurchases its shares will depend on market conditions and other corporate considerations at the Company’s sole discretion.

During the year ended December 31, 2020, the Company repurchased 278,582 shares at a total cost of $21.9 million under this program. As of December 31, 2020, approximately $46.1 million remained available under the share repurchase plan.

Fair Value

12 Months Ended

Dec. 31, 2020

Fair Value Disclosures [Abstract]

Fair Value

NOTE 19 - FAIR VALUE

The Company measures and reports certain financial assets and liabilities at fair value in accordance with Accounting Standard Codification, Fair Value Measurements and Disclosures (“ASC 820”). Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants on the measurement date. Generally, fair value is based on observable quoted market prices or derived from observable market data when such market prices or data are available. ASC 820 establishes a three-level hierarchy used to estimate fair value by which each level is categorized based on the priority of the inputs used to measure fair value:

•

Level 1: Quoted prices that are available in active markets for identical assets or liabilities;

•

Level 2: Quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active; inputs other than quoted prices that are observable for the asset or liability (e.g. interest rates and yield curves that are observable at commonly quoted intervals, and implied volatilities); and inputs derived principally from or corroborated by observable market data by correlation or other means; and

•

Level 3: Uses inputs that are unobservable and require the Company to make certain assumptions and require significant estimation and judgment from management to use in pricing the fair value of the assets and liabilities.

Certain financial instruments, including cash and cash equivalents, contract receivables, and accounts payable are carried at cost, which, due to their short maturities, approximates their fair values at December 31, 2020 and 2019. The carrying value of other long-term liabilities related to capital expenditure obligations approximates their fair value at December 31, 2020 and 2019 based on the current rates offered to the Company for similar instruments with comparable maturities (Level 2). The Company believes the carrying value of its Credit Facility at December 31, 2020 and 2019 approximates the estimated fair value for debt with similar terms, interest rates, and remaining maturities currently available to companies with similar credit ratings (Level 2).

The Company applies the provisions of ASC 820 to its assets and liabilities that are required to be measured at fair value pursuant to other accounting standards, including assets and liabilities resulting from the Company’s nonqualified deferred compensation plan, interest rate swap agreement (see Note 12 – Derivative Instruments and Hedging Activities), and foreign currency forward contract agreements not eligible for hedge accounting.

Financial instruments measured at fair value on a recurring basis and their location within the accompanying consolidated financial statements are as follows:

	December 31, 2020
(in thousands)	Level 1		Level 2		Level 3		Total		Location on Balance Sheet
Assets:
Forward contract agreements	$	—	$	103	$	—	$	103	Prepaid expenses and other
Deferred compensation investments in cash surrender life insurance		—		16,796		—		16,796	Other assets
Total	$	—	$	16,899	$	—	$	16,899

Liabilities:
Deferred compensation plan liabilities	$	—	$	17,276	$	—	$	17,276	Other long-term liabilities
Interest rate swaps - current portion		—		3,693		—		3,693	Accrued expenses and other current liabilities
Interest rate swaps - long-term portion		—		7,234		—		7,234	Other long-term liabilities
Total	$	—	$	28,203	$	—	$	28,203

	December 31, 2019
(in thousands)	Level 1		Level 2		Level 3		Total		Location on Balance Sheet
Assets:
Forward contract agreements	$	—	$	733	$	—	$	733	Prepaid expenses and other
Deferred compensation investments in cash surrender life insurance		—		15,020		—		15,020	Other assets
Total	$	—	$	15,753	$	—	$	15,753

Liabilities:
Deferred compensation plan liabilities	$	—	$	14,855	$	—	$	14,855	Other long-term liabilities
Interest rate swaps - current portion		—		1,069		—		1,069	Accrued expenses and other current liabilities
Interest rate swaps - long-term portion		—		2,742		—		2,742	Long-term Liabilities: Other
Total	$	—	$	18,666	$	—	$	18,666

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Contingencies and Contingencies

12 Months Ended

Dec. 31, 2020

Commitments And Contingencies Disclosure [Abstract]

Contingencies and Contingencies

NOTE 20 – COMMITMENT AND CONTINGENCIES

Litigation and Claims

The Company is involved in various legal matters and proceedings arising in the ordinary course of business. While these matters and proceedings cause it to incur costs, including, but not limited to, attorneys’ fees, the Company currently believes that any ultimate liability arising out of these matters and proceedings will not have a material adverse effect on the Company’s financial position, results of operations, or cash flows.

Road Home Contract

On June 10, 2016, the Office of Community Development (the “OCD”) of the State of Louisiana filed a written administrative demand with the Louisiana Commissioner of Administration against ICF Emergency Management Services, L.L.C. (“ICF

Emergency”), a subsidiary of the Company, in connection with ICF Emergency’s administration of the Road Home Program (the “Program”). The Program contract was a three-year, $912 million contract awarded to the Company in 2006 and that ended, as scheduled, in 2009.

The Program was primarily intended to help homeowners and landlords of small rental properties affected by Hurricanes Rita and Katrina. In its administrative demand, the OCD sought approximately $200.8 million in alleged overpayments to Program grant recipients. The State separately supplemented the amount of recovery it is seeking to total approximately $220.2 million. The State of Louisiana, through the Division of Administration, also filed suit in Louisiana state court on June 10, 2016 broadly alleging, and seeking recoupment for, the same claim made in the administrative proceeding submission before the Louisiana Commissioner of Administration. On September 21, 2016, the Commissioner of the Division of Administration notified OCD and the Company of his decision to defer jurisdiction of the administrative demand filed by the OCD. In so doing, the Commissioner declined to reach a decision on the merits, stated that his deferral would not be deemed to grant or deny any portion of the OCD’s claim, and authorized the parties to proceed on the matter in the previously filed judicial proceeding. The Company continues to believe that this claim has no merit, intends to vigorously defend its position, and has therefore not recorded a liability as of December 31, 2020.

Executive Chair Retirement

On November 15, 2020, Sudhakar Kesavan (the “Executive Chair”) gave notice of his retirement as Executive Chair, a member of the Board of Directors of the Company, and an officer and director of the Company’s subsidiaries and affiliated entities, in each case effective as of December 31, 2020. In connection with his retirement, the Executive Chair was entitled to receive, upon his departure, compensation such as immediate vesting of outstanding RSUs and other benefits as provided in his employment agreement (the “Employment Agreement”) for a termination of employment on the basis of “good reason.” Under the terms of the Employment Agreement, compensation included $1.8 million in severance, $0.9 million in pro rata annual incentive bonus, and $0.1 million in welfare benefits, payable subsequent to December 31, 2020. Additionally, all equity awards outstanding were accelerated, and outstanding options exercised. RSU awards, totaling 50,818 shares, previously vested and accelerated, were released to the Executive Chair on December 31, 2020, of which 24,550 shares were repurchased back by the Company to satisfy income tax withholding requirements. PSA awards totaling 50,112 shares at December 31, 2020, originally granted and vested and accelerated, are to be satisfied through the normal course of the PSA equity award plan subsequent to the retirement date, and subject to adjustments from EPS and rTSR performances, see Note 15 “Accounting for Stock-Based Compensation.”

Employee Benefit Plans

12 Months Ended

Dec. 31, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Employee Benefit Plans

NOTE 21 - EMPLOYEE BENEFIT PLANS

Retirement Savings Plan

Effective June 30, 1999, the Company established the ICF Consulting Group Retirement Savings Plan (the “Retirement Savings Plan”). The Retirement Savings Plan is a defined contribution profit sharing plan with a cash or deferred arrangement under Section 401(k) of the Internal Revenue Code. Participants in the Retirement Savings Plan are able to elect to defer up to 70% of their compensation, subject to statutory limitations, and are entitled to receive 100% employer matching contributions for the first 3% and 50% for the next 2% of their compensation. Contribution expense related to the Retirement Savings Plan for the years ended December 31, 2020, 2019, and 2018 was approximately $18.1 million, $17.3 million, and $16.2 million, respectively.

Deferred Compensation Plan

Certain key employees of the Company are eligible to defer a specified percentage of their cash compensation by having it contributed to a nonqualified deferred compensation plan. Eligible employees may elect to defer up to 80% of their base salary and up to 100% of performance bonuses, reduced by any amounts withheld for the payment of taxes or other deductions required by law. Participants are at all times 100% vested in their account balances. The Company funds its deferred compensation liabilities by making cash contributions to a Rabbi Trust at the time the salary or bonus being deferred would otherwise be payable to the employee. The liability to plan participants is materially funded at all times and the plan does not have a material net impact on the Company’s results of operations.

Employee Stock Purchase Plan

The Company has a 2006 Employee Stock Purchase Plan (“ESPP”) under which one million shares have been authorized for issuance. The ESPP allows eligible employees to purchase shares of the Company’s common stock through payroll deductions up to $25,000 per calendar year over six-month offering periods at a discount not to exceed 5% of the market value on the date of each purchase period, and therefore the Company does not recognize compensation expense related to the ESPP. For the years ended December 31, 2020 and 2019, employees purchased a total of 31,744 and 23,636 shares at an average purchase price of $64.77 and $78.05, respectively. At December 31, 2020 and 2019, there were 647,126 and 678,870 shares remaining available for future issuance.

F-34

Subsequent Events

12 Months Ended

Dec. 31, 2020

Subsequent Events [Abstract]

Subsequent Events

NOTE 22 - SUBSEQUENT EVENTS

Dividend

On February 25, 2021, the Company’s board of directors approved a $0.14 per share cash dividend. The dividend will be paid on April 13, 2021 to shareholders of record as of the close of business on March 26, 2021.

Supplemental Information

12 Months Ended

Dec. 31, 2020

Disclosure Text Block Supplement [Abstract]

Supplemental Information

NOTE 23 - SUPPLEMENTAL INFORMATION

Valuation and Qualifying Accounts

Allowance for Doubtful Accounts

	2020			2019			2018
Balance at beginning of period	$	3,506		$	5,284		$	3,853
Bad debt expense		4,062			624			2,480
Write-offs, net of recoveries		(41	)		(2,403	)		(1,027	)
Effect of foreign currency translation		89			1			(22	)
Balance at end of period	$	7,616		$	3,506		$	5,284

Income Tax Valuation Allowance

	2020		2019		2018
Balance at beginning of period	$	5,374	$	5,112	$	1,636
Provision for income taxes - valuation allowance		1,465		262		3,476
Balance at end of period	$	6,839	$	5,374	$	5,112

Selected Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2020

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information

NOTE 24 - SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)

	2020								2019
	1Q		2Q		3Q		4Q		1Q		2Q		3Q		4Q
Revenue	$	358,238	$	353,987	$	360,315	$	434,335	$	341,254	$	366,717	$	373,918	$	396,636
Operating income	$	16,319	$	22,782	$	28,250	$	21,758	$	21,889	$	22,542	$	28,664	$	28,298
Net income	$	10,612	$	13,656	$	17,871	$	12,820	$	15,318	$	14,611	$	19,630	$	19,379

Earnings per share:
Basic	$	0.56	$	0.73	$	0.95	$	0.68	$	0.81	$	0.78	$	1.04	$	1.03
Diluted	$	0.55	$	0.72	$	0.94	$	0.67	$	0.80	$	0.76	$	1.02	$	1.01

Weighted-average common shares outstanding
(in thousands)
Basic		18,840		18,829		18,853		18,841		18,825		18,805		18,799		18,834
Diluted		19,197		19,020		19,086		19,143		19,263		19,133		19,169		19,234

Cash dividends declared per common share	$	0.14	$	0.14	$	0.14	$	0.14	$	0.14	$	0.14	$	0.14	$	0.14

Summary of Significant Accounting Policies (Policies)	12 Months Ended
Summary of Significant Accounting Policies (Policies)	Dec. 31, 2020
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying consolidated financial statements include the accounts of ICF International, Inc. (“ICFI”) and its principal subsidiary, ICF Consulting Group, Inc. (“Consulting,” and together with ICFI, “the Company”), and have been prepared in accordance with United States (“U.S.”) generally accepted accounting principles (“U.S. GAAP”). Consulting is a wholly owned subsidiary of ICFI. ICFI is a holding company with no operations or assets other than its investment in the common stock of Consulting. All other subsidiaries of the Company are wholly owned by Consulting. All significant intercompany transactions and balances have been eliminated.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent liabilities at the date of the consolidated financial statements, and the reported amounts of revenue and expenses during the reporting periods. Areas of the consolidated financial statements where estimates may have the most significant effect include contractual and regulatory reserves, valuation and lives of tangible and intangible assets, contingent consideration related to business acquisitions, impairment of goodwill and long-lived assets, accrued liabilities, revenue recognition and costs to complete fixed-price contracts, bonus and other incentive compensation, stock-based compensation, reserves for tax benefits and valuation allowances on deferred tax assets, provisions for income taxes, collectability of receivables, and loss accruals for litigation. Actual results experienced by the Company may differ from management's estimates.
Reclassifications	Reclassifications Certain amounts in the December 31, 2019 balance sheet have been reclassified to conform to the current year presentation. As part of an amendment to the Credit Facility, as defined in Note 10 “Long-term Debt” below, the Company currently has both a term loan and a revolving debt facility within its Credit Facility. Previously, the unamortized debt issuance costs were included within Other assets in accordance with U.S. GAAP. The Company has reclassified unamortized debt issuance costs as of December 31, 2019 as Long-term debt for consistency of presentation. As part of recording the fair value of interest rate swaps, as defined in Note 19 “Fair Value” below, the Company has presented both a current and long-term component of the fair value of the interest rate swaps. Previously, the fair value of the interest rate swaps was included in other long-term liabilities. The Company has reclassified the current portion of the fair value of the interest rate swaps to other current liabilities as of December 31, 2019 for consistency of presentation.
Revenue Recognition	Revenue Recognition The Company primarily provides services and technology-based solutions for clients that operate in a variety of markets and the solutions may span the entire program life cycle, from initial research and analysis to the design and implementation of solutions. The Company enters into agreements with clients that create enforceable rights and obligations and for which it is probable that the Company will collect the consideration to which it will be entitled as services and solutions are transferred to the client. Except in certain narrowly defined situations, the Company’s agreements with its clients are written and revenue is generally not recognized on oral or implied arrangements. The Company recognizes revenue based on the consideration specified in the applicable agreement and excludes from revenue amounts collected on behalf of third parties. Accordingly, sales and similar taxes which are collected on behalf of third parties are excluded from the transaction price. The Company evaluates whether two or more agreements should be accounted for as one single contract and whether combined or single agreements should be accounted for as more than one performance obligation. For most contracts, the client requires the Company to perform a number of tasks in providing an integrated output for which the client has contracted, and, hence, contracts of this type are tracked as having only one performance obligation since a substantial part of the Company’s promise is to ensure the individual tasks are incorporated into a combined output in accordance with contract requirements. When contracts are separated into multiple performance obligations, the Company allocates the total transaction price to each performance obligation based on the estimated relative standalone selling prices of the promised services underlying each performance obligation. The Company generally provides customized solutions in which the pricing is based on specific negotiations with each client, and, in these cases, the Company uses a cost-plus margin approach to estimate the standalone selling price of each performance obligation. It is common for the Company’s long-term contracts to contain award fees, incentive fees or other provisions that can either increase or decrease the transaction price. These variable amounts are generally awarded at the completion of a contractually stipulated performance assessment period based on the achievement of performance metrics, program milestones or cost targets, and the amount awarded may be subject to client discretion. Variable consideration is estimated based on the most likely amount. Once the Company selects a method to estimate variable consideration, it applies that method consistently. Estimates of variable consideration will be constrained only to the extent that it is probable that significant reversal in the amount of cumulative revenue recognized will not occur. The Company evaluates contractual arrangements to determine whether revenue should be recognized on a gross versus net basis. The Company’s assessment is based on the nature of the promise to the client. In most cases, the Company itself agrees to provide specified services to the client as a principal and revenue is recognized on a gross basis. In certain instances, the Company acts as an agent and merely arranges for another party to provide services to the client and revenue is recognized on a net basis in reflection of the fact that the Company does not control the goods or services provided to the client by the other party. Long-term contracts typically contain billing terms that provide for invoicing monthly or upon completion of milestones, and payment on a net 30-day basis. Exceptions to monthly billing terms are to ensure that the Company performs satisfactorily rather than representing a significant financing component. For cost-based contracts the Company’s performance is evaluated during a contractually stipulated performance period and, while contract costs may be billed on a monthly basis, the Company is generally permitted to bill for incentive or award fees only after the completion of the performance assessment period, which may occur quarterly, semi-annually or annually, and after the client completes the performance assessment. Fixed-price contracts may provide for milestone billings based on the attainment of specific project objectives rather than for billing on a monthly basis. Moreover, contracts may require retentions or hold backs that are paid at the end of the contract to ensure that the Company performs in accordance with requirements. The Company does not assess whether a contract contains a significant financing component if the Company expects, at contract inception, that the period between payment by the client and the transfer of promised services to the client will be one year or less. As a service provider, the Company generally recognizes revenue over time as control is transferred to a client, based on the extent of progress towards satisfaction of the performance obligation. The selection of the method used to measure progress requires judgment and is dependent, among other factors, on the contract type selected by the client during contract negotiation and the nature of the services and solutions to be provided. When a performance obligation is billed using a time-and-materials contract type, the Company uses the right to invoice practical expedient output progress measure to estimate revenue earned based on hours worked in contract performance at negotiated billing rates. Fixed-price level-of-effort contracts are substantially similar to time-and-materials contracts except that the Company is required to deliver a specified level of effort over a stated period of time. For these contracts, the Company estimates revenue earned using contract hours worked at negotiated bill rates as the Company delivers the contractually required workforce. For cost-based contracts, the Company recognizes revenue based on contract costs incurred, as the Company becomes contractually entitled to reimbursement of the contract costs, plus a most likely estimate of award or incentive fees earned on those costs even though final determination of fees earned occurs after the contractually-stipulated performance assessment period ends. For performance obligations requiring the delivery of a service for a fixed price, the Company uses the ratio of actual costs incurred to total estimated costs, provided that costs incurred (an input method) represents a reasonable measure of progress towards the satisfaction of a performance obligation, in order to estimate the portion of total revenue earned. This method provides a faithful depiction of the transfer of value to the client when the Company is satisfying a performance obligation that entails integration of tasks for a combined output, which requires the Company to coordinate the work of employees, subcontractors and delivery of other contract costs. Contract costs that are not reflective of the Company’s progress toward satisfying a performance obligation are not included in the calculation of the measure of progress. When this method is used, changes in estimated costs to complete these obligations result in adjustments to revenue on a cumulative catch-up basis, which causes the effect of revised estimates for prior periods to be recognized in the current period. Changes in these estimates can routinely occur over contract performance for a variety of reasons, which include: changes in contract scope; changes in contract cost estimates due to unanticipated cost growth or reassessments of risks impacting costs; changes in estimated incentive or award fees; or performing better or worse than previously estimated. In some fixed price service contracts, the Company performs services of a recurring nature, such as maintenance and other services of a “stand ready” nature. For these contracts, the Company has the right to consideration in an amount that corresponds directly with the value that the client has received. Therefore, the Company records revenue on a time elapsed basis to reflect the transfer of control to the client throughout the contract. Contracts are often modified to reflect changes in contract specifications and requirements, and these changes may create new enforceable rights and obligations. Most modifications are for services that are not distinct from the existing agreement due to the significant integration service that the Company provides. Therefore, most modifications are accounted for as part of an existing performance obligation. The effect of these modifications on transaction price, and the Company’s measure of progress in fulfilling the performance obligation to which they relate, may be recognized as an adjustment to revenue on a cumulative catch-up basis. Revenue from modifications that create new, distinct performance obligations is recognized based on the Company’s progress in fulfilling the requirements of the new obligation. For contracts in which the estimated cost to perform exceeds the consideration to be received, the Company accrues for the entire estimated loss during the period in which the loss is determined by recording additional direct costs. For performance obligations that are satisfied over time, the Company recognizes the cost to fulfill contracts as incurred, unless the costs are within the scope of another topic in which case the guidance of that topic is applied. The Company evaluates incremental costs of obtaining a contract and, if they are recoverable from the client and relate to a specific future contract, they are deferred and recognized over contract performance or the estimated life of the customer relationship if renewals are expected. The Company expenses these costs when incurred if the amortization period is one year or less. Unfulfilled performance obligations represent amounts expected to be earned on contracts and do not include the value of negotiated, unexercised contract options, which are classified as marketing offers. Indefinite delivery/indefinite quantity and similar arrangements provide a framework for the client to issue specific tasks, delivery or purchase orders in the future and these arrangements are considered marketing offers until a specific order is executed. Revenue recognition entails the use of significant judgment, including, but not limited to, the following: evaluating agreements in terms of the number and nature of performance obligations; determining the appropriate method for measuring progress to satisfaction of obligations; determining if the Company is acting as a principal or an agent, and preparing estimates in terms of the amount of progress that the Company has made. For many fixed-price contracts, in particular, the Company estimates the proportion of total revenue earned using the ratio of contract costs incurred to total estimated contract costs, which requires the Company to prepare and, as necessary, revise estimates, as work progresses, of the total contract costs required to satisfy each respective performance obligation. Moreover, some of the Company’s contracts include variable consideration, which requires the Company to estimate and, as necessary, revise the most likely amounts that will be earned over the respective performance assessment periods. For these obligations, changes in estimates result in cumulative catch-up adjustments and may have a significant impact on earnings during a given period. The Company’s operating cycle for long-term contracts may be greater than one year and is measured by the average time intervening between the inception and the completion of those contracts. Contract-related assets and liabilities are classified as current assets and current liabilities. Significant balance sheet accounts related to the revenue recognition cycle are as follows: Contract receivables, net – This account includes amounts billed or billable under contract terms. The amounts due are stated at their net realizable value. The Company maintains an allowance for doubtful accounts to provide for the estimated amount of receivables that will not be collected. The Company considers a number of factors in its estimate of the allowance, including knowledge of a client’s financial condition, its historical collection experience, and other factors relevant to assessing the collectability of the receivables. The Company writes off specific contract receivables when such amounts are determined to be uncollectible. Contract assets – This account includes unbilled amounts typically resulting from revenue recognized on long-term contracts when the amount of revenue recognized exceeds the amounts billed. It also includes contract retainages until the Company has met the contract-stipulated requirements for payment. Contract assets are reported in a net position on a contract by contract basis each period even though individual contracts may contain multiple performance obligations. On a contract by contract basis, amounts do not exceed their net realizable value. Contract liabilities – This account consists of advance payments received and billings in excess of revenue recognized on long-term contracts. Contact liabilities are reported in a net position on a contract by contract basis each period even though individual contracts may contain multiple performance obligations.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers cash on deposit and all highly liquid investments with original maturities of three months or less when purchased to be cash and cash equivalents.
Restricted Cash	Restricted Cash The Company had restricted cash representing amounts held in escrow accounts and/or not readily available due to contractual restrictions.
Property and Equipment	Property and Equipment Property and equipment are carried at cost and are depreciated using the straight-line method over their estimated useful lives, which range from two to seven years. Leasehold improvements are amortized on a straight-line basis over the shorter of the economic life of the improvement or the related lease term.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets The purchase price of an acquired business is allocated to the tangible assets and separately identifiable intangible assets acquired, less liabilities assumed, based on their respective fair values, with the excess recorded as goodwill. Goodwill represents the excess of costs over the fair value of net assets of businesses acquired. Goodwill and intangible assets acquired in a business combination and determined to have an indefinite useful life are not amortized, but instead are reviewed for impairment annually, or more frequently if impairment indicators arise. Intangible assets with estimable useful lives are amortized over such lives and reviewed for impairment if impairment indicators arise.
Impairment	Impairment The Company performs its annual goodwill impairment test as of October 1 of each year. As its business is highly integrated and all of its components have similar economic characteristics, the Company has concluded it has one aggregated reporting unit at the consolidated entity level. The Company assesses goodwill at the reporting level. If, after opting to complete a qualitative assessment, the Company determines that it is more likely than not that the estimated fair value of the reporting unit exceeded its carrying amount, it may conclude that no impairment exists. If the Company concludes otherwise, a goodwill impairment test must be performed, which includes a comparison of the reporting unit’s fair value to the carrying amount and recognizing, as an impairment loss, the difference of the reporting unit’s fair value and the carrying amount of goodwill. The Company’s qualitative analysis as of October 1, 2020 included macroeconomic, industry and market specific considerations, financial performance indicators and measurements, and other factors. Based on this qualitative assessment, the Company determined that it is more likely than not that the fair value of its reporting unit exceeded its carrying amount, and thus any additional quantitative impairment test was not required to be performed. Therefore, based on management’s review, a goodwill impairment loss was not required for 2020. Historically, the Company has not recorded any goodwill impairment losses.
Long-Lived Assets	Long-Lived Assets The Company reviews its long-lived assets, including property and equipment, operating lease right-of-use (“ROU”) assets, and amortizable intangible assets, for impairment whenever events or changes in circumstances indicate that the carrying amounts of the assets may not be fully recoverable. If the total of the expected undiscounted future net cash flows is less than the carrying amount of the long-lived asset being evaluated, a loss is recognized for any excess of the carrying amount over the fair value of the asset. The Company recognized impairment expense, included in indirect and selling expenses, of $3.1 million during the year ended December 31, 2020 related to certain ROU assets and $1.7 million during the year ended December 31, 2019 related to intangible assets associated with a historical business acquisition.
Leases	Leases The Company determines if an arrangement is a lease at inception. Operating leases are included in operating lease ROU assets and operating lease liabilities (current and non-current) on the consolidated balance sheets. Operating lease ROU assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments as of the commencement date. Since most lease agreements do not provide an implicit rate, the Company uses its incremental borrowing rate as of the commencement date in estimating the present value of future payments. The operating lease ROU asset is based on the present value of future lease payments and excludes impacts from lease incentives and initial costs incurred to obtain the lease. At the lease commencement date, the Company estimates its collateralized incremental borrowing rate based on publicly available yields adjusted for Company-specific considerations and the Company's varying lease terms in determining the present value of future payments. Lease terms, for the purposes of determining each lease’s present value, include options to extend or terminate the lease if it is reasonably certain and economically reasonable that the Company will exercise that option. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. The Company uses leases to obtain use of a variety of different resources, including those for the use of facilities or equipment. These agreements may contain both lease and non-lease components, which are generally accounted for separately. For office equipment leases (primarily copier leases), the Company elected to account for the lease and non-lease components as a single lease component and not recognize ROU assets and lease liabilities for leases with a term not greater than twelve months.
Capitalized Software	Capitalized Software The Company capitalizes certain costs to develop enhancements and upgrades to internal-use software that are incurred subsequent to the preliminary project stage. Amortization expense is recorded on a straight-line basis over the expected economic life of the software or the service contract, typically lasting three to five years. As of December 31, 2020, and 2019, capitalized software costs were not material to the Company’s consolidated financial statements.
Stock-based Compensation	Stock-based Compensation The Company recognizes stock-based compensation expense related to share-based payments to employees, including grants of employee stock options, restricted stock awards, restricted stock units (“RSUs”), and cash-settled restricted stock units (“CSRSUs”) on a straight-line basis over the requisite service period, which is generally the vesting period. The Company recognizes expense for performance-based share awards (“PSAs”), which have both performance requirements and vesting conditions, on a straight-line basis over the three-year performance period. Non-employee director awards, which do not include vesting conditions, are for board-related services and therefore expensed when earned. Stock-based compensation expense is based on the estimated fair value of the instruments on award and the estimated number of shares the Company ultimately expects will vest. The Company estimates the rate of future forfeitures based on factors which include the historical forfeiture experience for each applicable employee class under the assumption that the rate of future forfeitures will be similar to that experienced in the past. In addition, the estimation of PSAs that will ultimately vest requires judgment based on the performance and market conditions that will be achieved over the performance period. Changes to these estimates are recorded as a cumulative adjustment in the period estimates are revised. The fair value of stock options, restricted stock awards, RSUs, PSAs, and non-employee director awards is estimated based on the fair value of a share of common stock at the grant date. The Company has elected to use the Black-Scholes-Merton option pricing model to determine the fair value of stock options. The fair value of PSAs is estimated using a Monte Carlo simulation model. CSRSUs are settled only in cash payments. The cash payment is based on the fair value of the Company’s stock price at the vesting date, calculated by multiplying the number of CSRSUs vested by the Company’s closing stock price on the vesting date, subject to a maximum payment cap and a minimum payment floor. The Company treats these awards as liability-classified awards, and, therefore, accounts for them at fair value estimated based on the closing price of the Company’s stock at the reporting date.
Derivative Instruments	Derivative Instruments Derivative instruments designated as cash flow hedges are recorded on the consolidated balance sheets at fair value as of the reporting date, and the effective portion of the hedge is recorded in other comprehensive income (loss) on the consolidated statements of comprehensive income and reclassified to earnings in the period that the hedged instruments affect earnings. Management reviews the effectiveness of the hedges on a quarterly basis.
Income Taxes	Income Taxes The Company recognizes deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates in effect for the year in which those temporary differences are expected to be recovered or settled. The Company evaluates its ability to benefit from all deferred tax assets and establishes valuation allowances for amounts it believes will more likely than not be unrealizable. For uncertain tax positions, the Company uses a more-likely-than-not recognition threshold based on the technical merits of the income tax position taken. Income tax positions that meet the more-likely-than-not recognition threshold are measured in order to determine the tax benefit recognized in the financial statements. Penalties, if probable and reasonably estimable, and interest expense related to uncertain tax positions are not recognized as a component of income tax expense but recorded separately in indirect expenses and interest expense, respectively.
Treasury Shares	Treasury Shares Treasury shares are accounted for under the cost method.
Other Comprehensive Income (Loss)	Other Comprehensive Income (Loss) Other comprehensive income (loss) represents foreign currency translation adjustments arising from the use of differing exchange rates from period to period, the gain on the sale of an interest rate hedge agreement designated as a cash flow hedge, and the changes in fair value of interest rate agreements designated as cash flow hedges, net of taxes. The financial positions and results of operations of the Company’s foreign subsidiaries are based on the local currency as the functional currency and are translated to U.S. dollars for financial reporting purposes. Assets and liabilities of the subsidiaries are translated at the exchange rate in effect at each balance sheet date. Income statement accounts are translated at the average rate of exchange prevailing during the period. Translation adjustments are reported in accumulated other comprehensive loss included in stockholders’ equity in the Company’s consolidated balance sheets.
Segment, Customer and Geographic Information	Segment, Customer and Geographic Information The Company operates in one segment based on the consolidated information used by its chief operating decision maker in evaluating the financial performance of its business and allocating resources. This single segment represents the Company’s core business, which is providing professional services for government and commercial clients. Although the Company disaggregates its revenue by client market areas and type, the Company does not manage its business or allocate resources based on client market or type. Approximately $667.0 million, $561.0 million, and $546.5 million of the Company’s revenue for the years 2020, 2019, and 2018, respectively, was derived under prime contracts and subcontracts with agencies and departments of the federal government representing 44%, 38%, and 41% of total revenue, respectively. No other customer accounted for 10% or more of the Company’s revenue during the years ended 2020, 2019, and 2018. The Company’s international operations provide services to both commercial and international government clients. Revenue is attributed to a particular geographic area based on the administrative location of the client that awarded the contract. The Company’s revenue generated from international clients as a percentage of total revenue was approximately 13%, 8%, and 13% for the years 2020, 2019, and 2018, respectively. At December 31, 2020 and 2019, long-lived assets held internationally were 15% and 17% of total long-lived assets, respectively.
Risk and Uncertainties	Risks and Uncertainties Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash and cash equivalents and contract receivables. The Company’s domestic bank accounts are insured up to $250,000 by the Federal Deposit Insurance Corporation. The majority of the Company’s cash transactions are processed through one U.S. commercial bank. Cash held domestically in excess of daily requirements is used to reduce any amounts outstanding under the Company’s Credit Facility. As of December 31, 2020 and 2019, the Company held approximately $81.5 million and $7.1 million, respectively, of cash and restricted cash in foreign bank accounts (not including outstanding deposits and checks). To date, the Company has not incurred losses related to cash and cash equivalents. The Company’s receivables consist principally of amounts due from agencies and departments of the federal government, state and local governments, and international governments, as well as from commercial organizations. The credit risk, with respect to federal and other government clients, is limited due to the creditworthiness of the respective governmental entity. Amounts due for work performed as a subcontractor to a commercial organization also represent limited credit risk when the commercial client is performing as the prime contractor on a government contract due to the ultimate creditworthiness of the end client. Receivables from commercial clients generally pose a greater credit risk, and, as a result, are subject to ongoing monitoring. The Company extends credit in the normal course of operations and does not require collateral from its clients. The Company has historically been, and continues to be, heavily dependent on contracts with the federal government which are subject to audit by agencies and departments of the federal government. Such audits determine, among other things, whether an adjustment to invoices previously rendered are required under regulations as well as the underlying terms of each respective contract. Management does not expect significant adjustments as a result of government audits that will adversely affect the Company’s financial position and results of operations.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Recent Accounting Pronouncements Adopted Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract In August 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2018-15, Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40). The standard aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is considered a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The standard also requires the entity to expense the capitalized implementation costs of a hosting arrangement over the term of the hosting arrangement and present the expense related to the capitalized implementation costs in the same line item in the statement of income as the fees associated with the hosting arrangement. The Company adopted the standard in the first quarter of 2020 and the standard was implemented using the prospective method. The Company’s adoption of ASU 2018-15 did not have a material impact on the consolidated financial statements. Measurement of Credit Losses on Financial Instruments In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses (Topic 326) – Measurement of Credit Losses on Financial Instruments. The standard, as amended, requires companies to measure credit losses by using a methodology that reflects the expected credit losses based on historical information, current economic conditions, and reasonable and supportable information. The Company adopted the standard in the first quarter of 2020 utilizing a modified-retrospective transition approach that required a cumulative-effect adjustment of $0.5 million to the opening retained earnings in the consolidated statement of stockholders’ equity as of the date of the adoption. Recent Accounting Pronouncements Not Yet Adopted Reference Rate Reform In March 2020, FASB issued ASU 2020-04, Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The standard is intended to provide temporary optional expedients and exceptions to the U.S. GAAP guidance on contract modifications and hedge accounting to ease the financial reporting burdens related to the expected market transition from the London Interbank Offered Rate (“LIBOR”) and other interbank offered rates to alternative reference rates. The provisions of this ASU are elective and apply to all entities, subject to meeting certain criteria, that have debt or hedging contracts, among other contracts, that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. The Company can elect to not apply certain modification accounting requirements to contracts affected by reference rate reform, if certain criteria are met. Also, the Company can elect various optional expedients that would allow for the Company to continue to apply hedge accounting for hedging relationships affected by reference rate reform, if certain criteria are met. This guidance was effective beginning on March 12, 2020, and the Company may elect to apply the amendments prospectively through December 31, 2022. The Company is currently evaluating the impact of the transition from LIBOR to alternative reference interest rates but does not expect a significant impact to its operating results, financial position or cash flows.

Restricted Cash (Tables)

12 Months Ended

Dec. 31, 2020

Restricted Cash And Cash Equivalents Current [Abstract]

Reconciliation of Cash and Cash Equivalents, and Restricted Cash

	2020				2019				2018
	Beginning		Ending		Beginning		Ending		Beginning		Ending
Cash and cash equivalents	$	6,482	$	13,841	$	11,694	$	6,482	$	11,809	$	11,694
Restricted cash - current ⁽¹⁾		—		68,146		—		—		11,191		—
Restricted cash - non-current		—		—		1,292		—		1,266		1,292
Total cash, cash equivalents, and restricted cash shown in the consolidated statement of cash flows	$	6,482	$	81,987	$	12,986	$	6,482	$	24,266	$	12,986

(1)	Restricted cash – current at the beginning of the year ended December 31, 2018 represents amounts held in an escrow account for the acquisition of The Future Customer (“TFC”).

Contract Receivables (Tables)

12 Months Ended

Dec. 31, 2020

Receivables [Abstract]

Summary of Contract Receivables

Contract receivables consisted of the following:

	December 31, 2020			December 31, 2019
Billed receivables	$	230,466		$	264,682
Allowance for doubtful accounts		(7,616	)		(3,506	)
Contract receivables, net	$	222,850		$	261,176

Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2020

Property Plant And Equipment [Abstract]

Property and Equipment

Property and equipment consisted of the following at December 31:

	2020			2019
Leasehold improvements	$	35,683		$	25,882
Software		53,001			52,343
Furniture and equipment		28,772			29,437
Computers		40,158			38,014
		157,614			145,676
Accumulated depreciation and amortization		(95,180	)		(87,439	)
Total property and equipment, net	$	62,434		$	58,237

Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill for the fiscal years ended December 31 were as follows:

	2020		2019
Balance as of January 1	$	719,934	$	715,644
Goodwill resulting from business combination - ITG		188,253		—
Goodwill resulting from business combination - DMS Disaster Consultants		—		(50	)
Goodwill resulting from business combination - We Are Vista		—		(370	)
Goodwill resulting from business combination - Olson ⁽¹⁾		—		3,047
Effect of foreign currency translation		1,726		1,663
Balance as of December 31	$	909,913	$	719,934

Schedule of Other Intangibles

Other intangibles consisted of the following at December 31:

	2020
	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Customer-related	$	142,849	$	(83,137	)	$	59,712
Developed technology		733		(653	)		80
Total amortizable intangible assets		143,582		(83,790	)		59,792
Intangible with indefinite life		95		—			95
Total other intangible assets	$	143,677	$	(83,790	)	$	59,887

	2019
	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Customer-related	$	95,038	$	(69,425	)	$	25,613
Developed technology		733		(612	)		121
Total amortizable intangible assets		95,771		(70,037	)		25,734
Intangible with indefinite life		95		—			95
Total other intangible assets	$	95,866	$	(70,037	)	$	25,829

Schedule of Estimated Future Amortization Expense Relating to Intangible Assets

The estimated future amortization expense relating to intangible assets is as follows:

Year ending December 31,
2021	$	12,049
2022		11,727
2023		11,339
2024		10,856
2025		6,904
Thereafter		6,917
Total	$	59,792

Leases (Tables)

12 Months Ended

Dec. 31, 2020

Leases [Abstract]

Summary of Operating Leases

Operating leases consisted of the following at December 31, 2020:

	December 31, 2020
Real estate facilities	$	157,010
Office equipment		1,864
Other		580
		159,454
Amortization of right-of-use assets		(32,322	)
Total operating lease right-of-use assets	$	127,132

Summary of Rent Expense

Rent expense is recognized on a straight-line basis over the lease term. Rent expense consists of the following:

	Year Ended December 31,
	2020		2019
Operating lease costs	$	37,874	$	36,210
Short-term lease costs		1,421		2,153
Variable lease costs		53		77
Total rent expense	$	39,348	$	38,440

Summary of Future Minimum Lease Payments Under Non-Cancellable Leases

Future minimum lease payments under non-cancellable leases as of December 31, 2020 were as follows:

			December 31, 2020
December 31, 2021			$	27,417
December 31, 2022				38,691
December 31, 2023				20,835
December 31, 2024				17,208
December 31, 2025				13,603
Thereafter				37,314
Total future minimum lease payments				155,068
Less: Interest				(16,104	)
Total operating lease liabilities			$	138,964

	December 31, 2020		December 31, 2019
Operating lease liabilities - current	$	23,350	$	32,500
Operating lease liabilities - non-current		115,614		119,250
Total operating lease liabilities	$	138,964	$	151,750

Summary of Other Information Related to Operating Leases

Other information related to operating leases is as follows:

	Year Ended December 31,
	2020			2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	41,025		$	36,907
Right-of-use assets obtained in exchange for new operating lease liabilities	$	29,790		$	31,123
Weighted-average remaining lease term - operating leases		5.9			5.1
Weighted-average discount rate - operating leases		3.4	%		3.7	%

Summary of Rent Expense For Periods Prior to Adoption of New Lease Standard

	2018
Rent	$	34,924
Sublease income		(45	)
Total rent expense	$	34,879

Accrued Salaries and Benefits (Tables)

12 Months Ended

Dec. 31, 2020

Schedule of Accrued Salaries and Benefits

Accrued salaries and benefits consisted of the following at December 31:

	2020		2019
Accrued bonuses, liability-classified awards, and commissions	$	24,464	$	17,660
Accrued salaries		21,282		16,170
Accrued paid time off and leave		15,046		12,157
Social security tax deferral		10,457		—
Accrued medical		3,238		3,063
Accrued payroll taxes and withholdings		1,033		930
Other		4,992		2,150
Total accrued salaries and benefits	$	80,512	$	52,130

Accrued Expenses and Other Current Liabilities (Tables)

12 Months Ended

Dec. 31, 2020

Payables And Accruals [Abstract]

Schedule of Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following at December 31:

	2020		2019
Deposits	$	9,881	$	9,608
Restricted contract funds		68,138		—
Accrued IT and software licensing costs		2,157		3,983
Accrued taxes and insurance premiums		4,327		3,498
Accrued facilities rental and lease exit costs		780		1,223
Accrued interest		214		693
Accrued professional services		2,094		3,929
Accrued dividends		2,641		2,639
Contingent and contractual liabilities from acquisitions		683		2,700
Interest rate swap liability - current		3,693		1,069
Other accrued expenses and current liabilities		6,300		7,469
Total accrued expenses and other current liabilities	$	100,908	$	36,811

Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2020

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

As of December 31, 2020 and 2019, long-term debt consisted of the following:

	December 31, 2020				December 31, 2019
	Average Interest Rate	Outstanding Balance			Average Interest Rate	Outstanding Balance
Term Loan		$	192,500			$	—
Revolving Credit			123,281				165,444
Total before debt issuance costs	2.35%		315,781		3.59%		165,444
Unamortized debt issuance costs			(2,567	)			(1,183	)
		$	313,214			$	164,261

Current portion of long-term debt		$	10,000			$	—
Long-term debt - non-current			303,214				164,261
		$	313,214			$	164,261

Schedule of Future Scheduled Repayments of Term Loan Principal

Future scheduled repayments of term loan principal are as follows:

Payments due by	Term Loan		Revolving Credit		Total
December 31, 2021	$	10,000	$	—	$	10,000
December 31, 2022		10,000		—		10,000
December 31, 2023		13,750		—		13,750
December 31, 2024		15,000		—		15,000
December 31, 2025		143,750		123,281		267,031
Thereafter		—				—
Total	$	192,500	$	123,281	$	315,781

Schedule of Net Debt Issuance Costs

The balance of net debt issuance costs at December 31, 2020 and 2019 are as follows:

	2020			2019
Amortizable debt issuance costs	$	8,751		$	6,921
Accumulated amortization		(6,184	)		(5,738	)
Net debt issuance costs	$	2,567		$	1,183

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2020

Revenue From Contract With Customer [Abstract]

Disaggregation of Revenue

	Year ended December 31,
	2020		2019		2018
Client Markets:
Energy, environment, and infrastructure	$	616,296	$	663,799	$	564,736
Health, education, and social programs		670,618		567,351		535,578
Safety and security		117,979		118,279		111,660
Consumer and financial		101,982		129,096		125,999
Total	$	1,506,875	$	1,478,525	$	1,337,973

	Year ended December 31,
	2020		2019		2018
Client Type:
U.S. federal government	$	666,961	$	560,953	$	546,050
U.S. state and local government		222,730		279,833		183,900
International government		95,734		122,125		122,186
Total Government		985,425		962,911		852,136
Commercial		521,450		515,614		485,837
Total	$	1,506,875	$	1,478,525	$	1,337,973

	Year ended December 31,
	2020		2019		2018
Contract Mix:
Time-and-materials	$	749,844	$	700,980	$	581,446
Fixed-price		529,157		566,299		526,751
Cost-based		227,874		211,246		229,776
Total	$	1,506,875	$	1,478,525	$	1,337,973

Schedule of Contract Balances and Changes in Contract Balances

Contract Balances:

	December 31, 2020			December 31, 2019			Change
Contract assets	$	143,369		$	142,337		$	1,032
Contract liabilities		(42,050	)		(37,413	)		(4,637	)
Net contract assets	$	101,319		$	104,924		$	(3,605	)

Derivative instruments and Hedges Activities (Tables)

12 Months Ended

Dec. 31, 2020

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Summary of Interest Rate Swaps Derivatives Designated as Cash Flow Hedges

A summary of Swaps designated as cash flow hedges as of December 31, 2020 are as follows:

			Dates of Effected Cash Flows
Date of Interest Rate Swap Agreement	Notional Amount ($million)	Paid Fixed Interest Rate%	Beginning	Ending
September 30, 2016 ⁽¹⁾	$100.0	-	January 31, 2018	January 31, 2023
August 31, 2017	$25.0	1.8475%	August 31, 2018	August 31, 2023
August 8, 2018	$50.0	2.8540%	August 31, 2018	August 31, 2023
August 8, 2018	$25.0	2.8510%	August 31, 2018	August 31, 2023
February 20, 2020	$100.0	1.2940%	February 28, 2020	February 28, 2025

(1)

Summary of Effect of Swaps on Company's Financial Statements

For the years ended December 31, 2020 and 2019, the effect of the Swaps on the Company’s financial statements are as follows:

Cash Flow Hedging Derivatives

Total Gain or (Loss) Recorded to

AOCI

Amount of (Gain) or Loss

Reclassified from AOCI into

Income

2020

2019

2020

2019

Interest Rate Swaps

(9,867

)

(3,362

)

2,031

(387

)

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Income Before Income Taxes

The domestic and foreign components of income before provision for income taxes are as follows for the years ended December 31:

	2020		2019		2018
Domestic	$	68,817	$	87,622	$	74,479
Foreign		5,856		2,551		8,348
Income before income taxes	$	74,673	$	90,173	$	82,827

Income Tax Expense Components

Income tax expense consisted of the following for the years ended December 31:

	2020			2019			2018
Current:
Federal	$	14,645		$	14,123		$	9,700
State		5,198			5,698			4,035
Foreign		1,736			1,537			2,418
Total current		21,579			21,358			16,153
Deferred:
Federal		(1,721	)		320			4,072
State		314			(25	)		1,452
Foreign		(458	)		(418	)		(250	)
Total deferred		(1,865	)		(123	)		5,274
Income tax expense	$	19,714		$	21,235		$	21,427

Deferred Tax Assets (Liabilities)

Deferred tax assets (liabilities) consisted of the following at December 31:

	2020			2019
Deferred Tax Assets
Allowance for bad debt	$	1,687		$	888
Accrued paid time off		2,423			1,671
Foreign net operating loss (NOL) carry forward		957			866
State net operating loss (NOL) carry forward		714			714
Stock option compensation		2,308			2,666
Deferred rent		3,091			3,129
Deferred compensation		4,598			3,902
Foreign tax credits		5,882			4,508
State tax credits		2,108			2,026
Foreign exchange		5,370			3,579
Foreign deferred		650			200
Accrued bonus		4,126			884
Accrued liabilities and other		5,701			4,434
		39,615			29,467
Less: Valuation Allowance		(6,839	)		(5,374	)
Total Deferred Tax Assets		32,776			24,093

Deferred Tax Liabilities
Retention		(1,003	)		(1,395	)
Prepaid expenses		(1,089	)		(1,451	)
Payroll taxes		(489	)		(593	)
Unbilled revenue		(1,451	)		(2,691	)
Depreciation		(1,731	)		(3,112	)
Amortization		(60,392	)		(52,076	)
Deferred gain and other		(951	)		(396	)
Total Deferred Tax Liabilities		(67,106	)		(61,714	)
Total Net Deferred Tax Liability	$	(34,330	)	$	(37,621	)

Unrecognized Tax Benefit Reconciliation

The unrecognized tax benefit reconciliation, excluding penalty and interest, is as follows:

Unrecognized tax benefits at January 1, 2018	$	820
Increase attributable to tax positions taken during the current period		216
Decrease attributable to settlements with taxing authorities		(37	)
Decrease attributable to lapse of statute of limitations		(783	)
Unrecognized tax benefits at December 31, 2018		216
Decrease attributable to tax positions taken during a prior period		(216	)
Unrecognized tax benefits at December 31, 2019		—
Increase attributable to tax positions taken during the current period		811
Unrecognized tax benefits at December 31, 2020	$	811

Effective Income Tax Rate Reconciliation

The Company’s provision for income taxes differs from the federal statutory rate. The differences between the statutory rate and the Company’s provision are as follows:

	2020			2019			2018
Taxes at statutory rate		21.0	%		21.0	%		21.0	%
State taxes, net of federal benefit		5.6	%		5.3	%		5.2	%
Foreign tax rate differential		0.3	%		0.3	%		0.5	%
Executive compensation		2.4	%		0.6	%		1.0	%
Other permanent differences		0.1	%		0.7	%		0.8	%
Prior year tax adjustments		(1.1	)%		(1.0	)%		0.2	%
Unrecognized tax benefits		1.0	%		(0.2	)%		(0.6	)%
Valuation allowance		1.6	%		1.1	%		1.3	%
Equity-based compensation		(3.8	)%		(3.6	)%		(3.0	)%
Tax credits		(0.7	)%		(0.6	)%		(0.5	)%
Taxes at effective rate		26.4	%		23.6	%		25.9	%

Accumulated Other Comprehensive Loss (Tables)

12 Months Ended

Dec. 31, 2020

Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]

Components of Accumulated Other Comprehensive Loss

Accumulated other comprehensive loss included the following:

	Foreign Currency Translation Adjustments			Gain on Sale of Interest Rate Hedge Agreement ⁽¹⁾			Changes in Fair Value of Interest Rate Hedge Agreements ⁽²⁾⁽⁵⁾			Total
Accumulated other comprehensive (loss) income at January 1, 2018	$	(7,638	)	$	2,158		$	441		$	(5,039	)
Reclassification of stranded tax effects due to adoption of accounting principle ⁽⁶⁾		(1,307	)		478			—			(829	)
Adjusted beginning balance		(8,945	)		2,636			441			(5,868	)
Current period other comprehensive (loss) income:
Other comprehensive loss before reclassifications		(4,711	)		—			(1,184	)		(5,895	)
Amounts reclassified from accumulated other comprehensive income		—			(660	)		(12	)		(672	)
Effect of taxes ⁽³⁾		(512	)		188			208			(116	)
Total current period other comprehensive loss		(5,223	)		(472	)		(988	)		(6,683	)
Accumulated other comprehensive (loss) income at December 31, 2018		(14,168	)		2,164			(547	)		(12,551	)
Other comprehensive income (loss) before reclassifications		2,338			—			(3,362	)		(1,024	)
Amounts reclassified from accumulated other comprehensive income		—			(720	)		333			(387	)
Effect of taxes ⁽³⁾		835			190			793			1,818
Total current period other comprehensive income (loss)		3,173			(530	)		(2,236	)		407
Accumulated other comprehensive (loss) income at December 31, 2019		(10,995	)		1,634			(2,783	)		(12,144	)
Other comprehensive income (loss) before reclassifications		4,141			—			(9,867	)		(5,726	)
Amounts reclassified from accumulated other comprehensive income ⁽⁴⁾		—			(720	)		2,751			2,031
Effect of taxes ⁽³⁾		(356	)		182			1,907			1,733
Total current period other comprehensive income (loss)		3,785			(538	)		(5,209	)		(1,962	)
Accumulated other comprehensive (loss) income at December 31, 2020	$	(7,210	)	$	1,096		$	(7,992	)	$	(14,106	)

(1)

(2)

(3)	The Company’s effective tax rate for the years ended December 31, 2020, 2019, and 2018 was 26.4%, 23.6%, and 25.9%, respectively.

(4)	The Company expects to reclassify $0.7 million related to the Gain on Sale of Interest Rate Hedge Agreement, and $3.7 million losses related to the Change in Fair Value of Interest Rate Hedge Agreement from accumulated other comprehensive loss into earnings during the next 12 months.

(5)	The fair value of the interest rate hedge agreements is included in other current and other long-term liabilities on the consolidated balance sheet.

(6)	The Company has adjusted the balance of accumulated other comprehensive (loss) income at December 3, 2017 after the adoption of ASU 2018-02.

Accounting for Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Schedule of Stock-based Compensation Expense

	Stock-Based Compensation Expense
	Recognized as of December 31,						Unrecognized
	2020		2019		2018		December 31, 2020		Weighted Average Period to Recognize (years)
Restricted Stock Units	$	11,895	$	10,644	$	7,410	$	10,777		1.7
Cash-Settled Restricted Stock Units		7,015		10,213		8,214		8,688		1.5
Non-Employee Director Awards		755		719		764		383		0.4
Performance Shares		4,905		4,455		3,193		2,229		1.5
Total	$	24,570	$	26,031	$	19,581	$	22,077

Outstanding Stock Option Activity

The following table summarizes the changes in outstanding stock options:

	Number of Shares			Weighted Average Exercise Price		Aggregate Intrinsic Value
Outstanding at January 1, 2018		411,498		$	30.71
Exercised		(209,688	)	$	27.86
Granted		—		$	—
Forfeited/Expired		—		$	—
Outstanding at December 31, 2018		201,810		$	33.68
Exercised		(93,682	)	$	31.21
Granted		—		$	—
Forfeited/Expired		—		$	—
Outstanding at December 31, 2019		108,128		$	35.82
Exercised		(69,901	)	$	37.94
Granted		—		$	—
Forfeited/Expired		—		$	—
Outstanding at December 31, 2020		38,227		$	31.93	$	1,620,688
Vested plus expected to vest at December 31, 2020		38,227		$	31.93	$	1,620,688
Exercisable at December 31, 2020		38,227		$	31.93	$	1,620,688

Schedule of Stock Options Outstanding by Exercise Price Range

Information regarding stock options outstanding as of December 31, 2020 is summarized below:

	OPTIONS OUTSTANDING						OPTIONS EXERCISABLE
Range of Exercise Prices	Number Outstanding As of December 31, 2020		Weighted Average Remaining Contractual Term		Weighted Average Exercise Price		Number Exercisable As of December 31, 2020		Weighted Average Exercise Price
$21.77 to $25.00		1,915		0.3	$	21.77		1,915	$	21.77
$25.01 to $27.00		6,332		1.2	$	25.66		6,332	$	25.66
$27.01 to $40.00		14,874		2.2	$	27.03		14,874	$	27.03
$40.01 to $41.00		15,106		3.2	$	40.68		15,106	$	40.68
$21.77 to $41.00		38,227		2.3	$	—		38,227	$	31.93

Summary of Non-employee Director Awards

A summary of the Company’s non-employee director awards of unregistered shares granted by fiscal year is presented below.

For the Year ended December 31,

Number of

Granted

Weighted-

Average Grant

Date Fair Value

2018

7,985

60.36

	Number of Shares			Weighted- Average Grant Date Fair Value		Aggregate Intrinsic Value
Non-vested RSUs at July 1, 2018		—		$	—
Granted		11,606		$	72.35
Vested		(5,395	)	$	72.35
Cancelled		(1,243	)	$	72.35
Non-vested RSUs at December 31, 2018		4,968		$	72.35
Granted		9,732		$	73.94
Vested		(9,840	)	$	73.14
Cancelled		—		$	—
Non-vested RSUs at December 31, 2019		4,860		$	73.94
Granted		12,541		$	64.58
Vested		(10,891	)	$	68.82
Cancelled		—		$	—
Non-vested RSUs at December 31, 2020		6,510		$	64.47	$	483,888
RSUs expected to vest in the future		6,510		$	64.47	$	483,888

Summary of Performance Shares Activity

A summary of the Company’s PSAs is presented below.

	Number of Shares			Weighted- Average Grant Date Fair Value		Aggregate Intrinsic Value
Non-vested PSAs at January 1, 2018		187,022		$	39.95
Granted		45,136		$	65.05
Vested		(30,576	)	$	44.21
Cancelled		(32,096	)	$	43.72
Non-vested PSAs at December 31, 2018		169,486		$	45.15
Granted		85,928		$	62.07
Vested		(107,000	)	$	37.21
Cancelled		—		$	—
Non-vested PSAs at December 31, 2019		148,414		$	60.67
Granted		87,314		$	51.44
Vested		(88,038	)	$	38.81
Cancelled		(5,569	)	$	69.66
Non-vested PSAs at December 31, 2020		142,121		$	68.19	$	10,563,854
PSAs expected to vest in the future		94,178		$	69.76	$	7,000,251

Schedule of Fair Value Assumptions using Monte Carlo Simulation Model for Awards Granted

The fair value assumptions using the Monte Carlo simulation model for awards granted in 2020, 2019, and 2018 were:

	2020			2019			2018
Dividend Yield		1.0	%		0.7	%		0.9	%
Historical Volatility		35.7	%		29.3	%		31.9	%
Risk-Free Rate of Returns		0.4	%		2.4	%		2.4	%

Restricted Stock Units (RSUs)

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Schedule of Restricted Stock Unit Activity

A summary of the Company’s RSUs is presented below.

	Number of Shares			Weighted- Average Grant Date Fair Value		Aggregate Intrinsic Value
Non-vested RSUs at January 1, 2018		463,587		$	38.71
Granted		235,480		$	65.37
Vested		(169,279	)	$	38.66
Cancelled		(55,548	)	$	47.50
Non-vested RSUs at December 31, 2018		474,240		$	50.93
Granted		159,831		$	77.74
Vested		(164,913	)	$	43.82
Cancelled		(19,183	)	$	56.18
Non-vested RSUs at December 31, 2019		449,975		$	62.48
Granted		170,411		$	58.27
Vested		(258,307	)	$	54.73
Cancelled		(56,680	)	$	63.46
Non-vested RSUs at December 31, 2020		305,399		$	66.51	$	22,700,308
RSUs expected to vest in the future		279,087		$	66.69	$	20,744,537

Cash Settled RSUs

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Schedule of Restricted Stock Unit Activity

CSRSUs generally have a vesting term of three to four years. A summary of the Company’s CSRSUs is presented below.

	Number of Shares			Weighted- Average Grant Date Fair Value		Aggregate Intrinsic Value
Non-vested CSRSUs at January 1, 2018		391,916		$	38.80
Granted		147,103		$	60.84
Vested		(147,759	)	$	38.71
Cancelled		(53,854	)	$	43.07
Non-vested CSRSUs at December 31, 2018		337,406		$	47.73
Granted		103,606		$	77.03
Vested		(123,395	)	$	44.61
Cancelled		(21,384	)	$	53.99
Non-vested CSRSUs at December 31, 2019		296,233		$	58.83
Granted		134,259		$	60.30
Vested		(154,653	)	$	49.44
Cancelled		(34,358	)	$	63.03
Non-vested CSRSUs at December 31, 2020		241,481		$	65.06	$	17,949,283
CSRSUs expected to vest in the future		213,305		$	65.17	$	15,854,961

Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Schedule of Dilutive Effect of Stock Options RSUs and PSAs

The dilutive effect of stock options, RSUs, and performance shares for each period reported is summarized below:

	2020		2019		2018
Basic weighted-average shares outstanding		18,841		18,816		18,797
Effect of potential exercise of stock options, RSUs, and PSAs		294		408		538
Diluted weighted-average shares outstanding		19,135		19,224		19,335

Fair Value (Tables)

12 Months Ended

Dec. 31, 2020

Fair Value Disclosures [Abstract]

Schedule of Financial Instruments Measured at Fair Value on Recurring Basis

Financial instruments measured at fair value on a recurring basis and their location within the accompanying consolidated financial statements are as follows:

	December 31, 2020
(in thousands)	Level 1		Level 2		Level 3		Total		Location on Balance Sheet
Assets:
Forward contract agreements	$	—	$	103	$	—	$	103	Prepaid expenses and other
Deferred compensation investments in cash surrender life insurance		—		16,796		—		16,796	Other assets
Total	$	—	$	16,899	$	—	$	16,899

Liabilities:
Deferred compensation plan liabilities	$	—	$	17,276	$	—	$	17,276	Other long-term liabilities
Interest rate swaps - current portion		—		3,693		—		3,693	Accrued expenses and other current liabilities
Interest rate swaps - long-term portion		—		7,234		—		7,234	Other long-term liabilities
Total	$	—	$	28,203	$	—	$	28,203

	December 31, 2019
(in thousands)	Level 1		Level 2		Level 3		Total		Location on Balance Sheet
Assets:
Forward contract agreements	$	—	$	733	$	—	$	733	Prepaid expenses and other
Deferred compensation investments in cash surrender life insurance		—		15,020		—		15,020	Other assets
Total	$	—	$	15,753	$	—	$	15,753

Liabilities:
Deferred compensation plan liabilities	$	—	$	14,855	$	—	$	14,855	Other long-term liabilities
Interest rate swaps - current portion		—		1,069		—		1,069	Accrued expenses and other current liabilities
Interest rate swaps - long-term portion		—		2,742		—		2,742	Long-term Liabilities: Other
Total	$	—	$	18,666	$	—	$	18,666

- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

+ References + Details

Supplemental Information (Tables)

12 Months Ended

Dec. 31, 2020

Disclosure Text Block Supplement [Abstract]

Schedule of Allowance for Doubtful Accounts

Allowance for Doubtful Accounts

	2020			2019			2018
Balance at beginning of period	$	3,506		$	5,284		$	3,853
Bad debt expense		4,062			624			2,480
Write-offs, net of recoveries		(41	)		(2,403	)		(1,027	)
Effect of foreign currency translation		89			1			(22	)
Balance at end of period	$	7,616		$	3,506		$	5,284

Schedule of Income Tax Valuation Allowance

Income Tax Valuation Allowance

	2020		2019		2018
Balance at beginning of period	$	5,374	$	5,112	$	1,636
Provision for income taxes - valuation allowance		1,465		262		3,476
Balance at end of period	$	6,839	$	5,374	$	5,112

Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2020

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information

	2020								2019
	1Q		2Q		3Q		4Q		1Q		2Q		3Q		4Q
Revenue	$	358,238	$	353,987	$	360,315	$	434,335	$	341,254	$	366,717	$	373,918	$	396,636
Operating income	$	16,319	$	22,782	$	28,250	$	21,758	$	21,889	$	22,542	$	28,664	$	28,298
Net income	$	10,612	$	13,656	$	17,871	$	12,820	$	15,318	$	14,611	$	19,630	$	19,379

Earnings per share:
Basic	$	0.56	$	0.73	$	0.95	$	0.68	$	0.81	$	0.78	$	1.04	$	1.03
Diluted	$	0.55	$	0.72	$	0.94	$	0.67	$	0.80	$	0.76	$	1.02	$	1.01

Weighted-average common shares outstanding
(in thousands)
Basic		18,840		18,829		18,853		18,841		18,825		18,805		18,799		18,834
Diluted		19,197		19,020		19,086		19,143		19,263		19,133		19,169		19,234

Cash dividends declared per common share	$	0.14	$	0.14	$	0.14	$	0.14	$	0.14	$	0.14	$	0.14	$	0.14

Basis of Presentation and Nature of Operations - Additional Information (Details) - Minimum	Dec. 31, 2020 Office
Domestic
Basis of Presentation and Nature of Operations [Line Items]
Number of offices	56
International
Basis of Presentation and Nature of Operations [Line Items]
Number of offices	22

Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) Segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Contract payment term description									contracts typically contain billing terms that provide for invoicing monthly or upon completion of milestones, and payment on a net 30-day basis.
Contracts payment, term									30 days
Number of reportable segments \| Segment									1
Goodwill, impaired, accumulated impairment loss	$ 0								$ 0
Goodwill, impairment loss									$ 0
Performance based share awards, performance period									3 years
Number of operating segments \| Segment									1
Revenue	434,335,000	$ 360,315,000	$ 353,987,000	$ 358,238,000	$ 396,636,000	$ 373,918,000	$ 366,717,000	$ 341,254,000	$ 1,506,875,000	$ 1,478,525,000	$ 1,337,973,000
Foreign financial institutions, actual deposits	81,500,000				$ 7,100,000				81,500,000	7,100,000
Federal Government Agencies And Departments
Summary Of Significant Accounting Policies [Line Items]
Revenue									$ 667,000,000.0	$ 561,000,000.0	$ 546,500,000
Federal Government Agencies And Departments \| Customer Concentration Risk \| Sales Revenue, Net
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage									44.00%	38.00%	41.00%
International Clients \| Geographic Concentration Risk \| Sales Revenue, Net
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage									13.00%	8.00%	13.00%
International \| Long-Lived Assets
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage									15.00%	17.00%
Indirect and Selling Expenses
Summary Of Significant Accounting Policies [Line Items]
Impairment expense related to intangible assets									$ 3,100,000	$ 1,700,000
Minimum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful life									2 years
Finite-lived intangible asset, useful life									1 year
Minimum \| Other Assets
Summary Of Significant Accounting Policies [Line Items]
Finite-lived intangible asset, useful life									3 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful life									7 years
Finite-lived intangible asset, useful life									10 years
Insured domestic bank accounts	$ 250,000								$ 250,000
Maximum \| Other Assets
Summary Of Significant Accounting Policies [Line Items]
Finite-lived intangible asset, useful life									5 years

Restricted Cash - Reconciliation of Cash and Cash Equivalents, and Restricted Cash to the Total of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands

Dec. 31, 2020

Dec. 31, 2019

Dec. 31, 2018

Dec. 31, 2017

Cash And Cash Equivalents [Abstract]

Cash and cash equivalents

$ 13,841

$ 6,482

$ 11,694

$ 11,809

Restricted cash - current

^[1]

68,146

11,191

Restricted cash - non-current

1,292

1,266

Total cash, cash equivalents, and restricted cash shown in the consolidated statement of cash flows

$ 81,987

$ 6,482

$ 12,986

$ 24,266

[1]	Restricted cash – current at the beginning of the year ended December 31, 2018 represents amounts held in an escrow account for the acquisition of The Future Customer (“TFC”).

Contract Receivables - Summary of Contract Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Receivables [Abstract]
Billed receivables	$ 230,466	$ 264,682
Allowance for doubtful accounts	(7,616)	(3,506)
Contract receivables, net	$ 222,850	$ 261,176

Property and Equipment - Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 157,614	$ 145,676
Accumulated depreciation and amortization	(95,180)	(87,439)
Total property and equipment, net	62,434	58,237
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	35,683	25,882
Software and Software Development Costs
Property Plant And Equipment [Line Items]
Property and equipment, gross	53,001	52,343
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, gross	28,772	29,437
Computer Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 40,158	$ 38,014

Property and Equipment - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property Plant And Equipment [Abstract]
Depreciation and amortization expense	$ 20,399	$ 20,099	$ 17,163

Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands

12 Months Ended

Jan. 31, 2020

Dec. 31, 2020

Dec. 31, 2019

Goodwill [Line Items]

Balance as of January 1

$ 719,934

$ 715,644

Effect of foreign currency translation

1,726

1,663

Balance as of December 31

909,913

719,934

ITG

Goodwill [Line Items]

Goodwill resulting from business combination

$ 188,300

$ 188,253

DMS Disaster Consultants

Goodwill [Line Items]

Goodwill resulting from business combination

(50)

Vista Limited

Goodwill [Line Items]

Goodwill resulting from business combination

(370)

Olson

Goodwill [Line Items]

Goodwill resulting from business combination

^[1]

$ 3,047

[1]

Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Amortization of Intangible Assets		$ 13.3	$ 8.1	$ 10.0
Indirect and Selling Expenses
Impairment expense related to intangible assets	$ 1.7
Minimum
Finite-lived intangible asset, useful life		1 year
Maximum
Finite-lived intangible asset, useful life		10 years
Weighted Average
Finite-lived intangible asset, useful life		8 years 6 months
Weighted Average \| Customer Relationships
Finite-lived intangible asset, useful life		8 years 6 months
Weighted Average \| Technology-Based Intangible Assets
Finite-lived intangible asset, useful life		4 years 9 months 18 days

Goodwill and Other Intangible Assets - Schedule of Other Intangibles (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Finite lived intangible assets, gross carrying value	$ 143,582	$ 95,771
Accumulated amortization	(83,790)	(70,037)
Finite lived intangible assets, net carrying value	59,792	25,734
Indefinite lived intangible assets, gross carrying value	95	95
Total intangible assets, gross carrying value	143,677	95,866
Other intangible assets, net	59,887	25,829
Customer-Related Intangible Assets
Finite lived intangible assets, gross carrying value	142,849	95,038
Accumulated amortization	(83,137)	(69,425)
Finite lived intangible assets, net carrying value	59,712	25,613
Developed Technology Rights
Finite lived intangible assets, gross carrying value	733	733
Accumulated amortization	(653)	(612)
Finite lived intangible assets, net carrying value	$ 80	$ 121

Goodwill and Other Intangible Assets - Schedule of Estimated Future Amortization Expense Relating to Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
2021	$ 12,049
2022	11,727
2023	11,339
2024	10,856
2025	6,904
Thereafter	6,917
Finite lived intangible assets, net carrying value	$ 59,792	$ 25,734

Leases - Additional Information (Details) $ in Millions	12 Months Ended
Leases - Additional Information (Details) $ in Millions	Dec. 31, 2020 USD ($)
Lessee Lease Description [Line Items]
Operating leases, option to extend lease	The leases may include options to extend the lease periods for up to 5 years
Operating leases, existence of option to extend	true
Operating leases, option to terminate lease	options to terminate the leases within 1 year
Operating leases, existence of option to terminate	true
Operating leases, residual value guarantee description	The leases may include a residual value guarantee or a responsibility to return the property to its original state of use.
Operating leases, existence of residual value guarantee	true
Additional operating leases not yet commenced, value	$ 118.5
Additional operating leases not yet commenced, lease term	18 years
Minimum
Lessee Lease Description [Line Items]
Operating leases, remaining lease term	1 year
Maximum
Lessee Lease Description [Line Items]
Operating leases, remaining lease term	13 years
Operating leases, extendable lease term	5 years
Operating leases, termination lease term	1 year

Leases - Summary of Operating Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Lessee Lease Description [Line Items]
Operating lease right of use assets, gross	$ 159,454
Amortization of right-of-use assets	(32,322)
Total operating lease right-of-use assets	127,132	$ 133,965
Real Estate Facilities
Lessee Lease Description [Line Items]
Operating lease right of use assets, gross	157,010
Office Equipment
Lessee Lease Description [Line Items]
Operating lease right of use assets, gross	1,864
Other
Lessee Lease Description [Line Items]
Operating lease right of use assets, gross	$ 580

Leases - Summary of Rent Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease costs	$ 37,874	$ 36,210
Short-term lease costs	1,421	2,153
Variable lease costs	53	77
Total rent expense	$ 39,348	$ 38,440

Leases - Summary of Future Minimum Lease Payments Under Non-Cancellable Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
December 31, 2021	$ 27,417
December 31, 2022	38,691
December 31, 2023	20,835
December 31, 2024	17,208
December 31, 2025	13,603
Thereafter	37,314
Total future minimum lease payments	155,068
Less: Interest	(16,104)
Total operating lease liabilities	138,964	$ 151,750
Operating lease liabilities - current	23,350	32,500
Operating lease liabilities - non-current	115,614	119,250
Total operating lease liabilities	$ 138,964	$ 151,750

Leases - Summary of Other Information Related to Operating Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating cash flows from operating leases	$ 41,025	$ 36,907
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 29,790	$ 31,123
Weighted-average remaining lease term - operating leases	5 years 10 months 24 days	5 years 1 month 6 days
Weighted-average discount rate - operating leases	3.40%	3.70%

Leases - Operating Lease Rent Expense (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Leases [Abstract]
Rent	$ 34,924
Sublease income	(45)
Total rent expense	$ 34,879

Accrued Salaries and Benefits - Schedule of Accrued Salaries and Benefits (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Employee Related Liabilities Current [Abstract]
Accrued bonuses, liability-classified awards, and commissions	$ 24,464	$ 17,660
Accrued salaries	21,282	16,170
Accrued paid time off and leave	15,046	12,157
Social security tax deferral	10,457
Accrued medical	3,238	3,063
Accrued payroll taxes and withholdings	1,033	930
Other	4,992	2,150
Total accrued salaries and benefits	$ 80,512	$ 52,130

Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Payables And Accruals [Abstract]
Deposits	$ 9,881	$ 9,608
Restricted contract funds	68,138
Accrued IT and software licensing costs	2,157	3,983
Accrued taxes and insurance premiums	4,327	3,498
Accrued facilities rental and lease exit costs	780	1,223
Accrued interest	214	693
Accrued professional services	2,094	3,929
Accrued dividends	2,641	2,639
Contingent and contractual liabilities from acquisitions	683	2,700
Interest rate swap liability - current	3,693	1,069
Other accrued expenses and current liabilities	6,300	7,469
Total accrued expenses and other current liabilities	$ 100,908	$ 36,811

Long-Term Debt - Additional Information (Details)		12 Months Ended
Long-Term Debt - Additional Information (Details)	Mar. 03, 2020 USD ($) Bank	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Credit facility group, number of commercial banks \| Bank	10
Line of credit facility, expiration date		Mar. 03, 2025
Line of credit facility, swing line commitment amount	$ 25,000,000.0
Line of credit facility, maximum borrowing capacity	60,000,000.0
Line of credit facility, additional revolving credit commitments under existing loan facility	$ 300,000,000.0
Line of credit facility, leverage ratio covenant	400.00%	20.00%	15.00%
Line of credit facility, interest coverage ratio covenant	300.00%
Line of credit facility, leverage ratio covenant step-up pursuant to permitted acquisitions	425.00%
Line of credit facility, remaining borrowing capacity		$ 474,000,000.0
Line of credit facility, current borrowing capacity		276,100,000
Amortization of debt issuance costs		$ 710,000	$ 507,000	$ 510,000
Number of letters of credit, outstanding		10	9
Letters of credit outstanding, amount		$ 2,700,000	$ 3,000,000.0
Federal Funds Open Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.50%
London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		1.75%
Debt instrument, LIBOR based borrowing interest rate		1.89%
Revolving Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 600,000,000.0
Term Loan
Debt Instrument [Line Items]
Debt instrument, principal amount	200,000,000.0
Line of credit facility	200,000,000.0
Swing Line Loans
Debt Instrument [Line Items]
Line of credit facility	75,000,000.0
Maximum
Debt Instrument [Line Items]
Line of credit facility, swing line commitment amount	$ 75,000,000.0
Line of credit facility, commitment fee unused capacity	0.25%
Maximum \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.00%
Minimum
Debt Instrument [Line Items]
Line of credit facility, commitment fee unused capacity	0.13%
Minimum \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.00%

Long-Term Debt - Schedule of Long-Term Debt Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Average Interest Rate	2.35%	3.59%
Outstanding Balance before debt issuance costs	$ 315,781	$ 165,444
Unamortized debt issuance costs	(2,567)	(1,183)
Long-term Debt	313,214	164,261
Current portion of long-term debt	10,000
Long-term debt	303,214	164,261
Term Loan
Debt Instrument [Line Items]
Outstanding Balance before debt issuance costs	192,500
Revolving Credit
Debt Instrument [Line Items]
Outstanding Balance before debt issuance costs	$ 123,281	$ 165,444

Long Term Debt - Schedule of Future Scheduled Repayments of Term Loan Principal (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
December 31, 2021	$ 10,000
December 31, 2022	10,000
December 31, 2023	13,750
December 31, 2024	15,000
December 31, 2025	267,031
Total	315,781	$ 165,444
Term Loan
Debt Instrument [Line Items]
December 31, 2021	10,000
December 31, 2022	10,000
December 31, 2023	13,750
December 31, 2024	15,000
December 31, 2025	143,750
Total	192,500
Revolving Credit
Debt Instrument [Line Items]
December 31, 2025	123,281
Total	$ 123,281	$ 165,444

Long-Term Debt - Schedule of Net Debt Issuance Costs (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
Amortizable debt issuance costs	$ 8,751	$ 6,921
Accumulated amortization	(6,184)	(5,738)
Net debt issuance costs	$ 2,567	$ 1,183

Revenue Recognition - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Revenue from clients	$ 434,335	$ 360,315	$ 353,987	$ 358,238	$ 396,636	$ 373,918	$ 366,717	$ 341,254	$ 1,506,875	$ 1,478,525	$ 1,337,973
Time-and-Materials
Disaggregation Of Revenue [Line Items]
Revenue from clients									749,844	700,980	581,446
Fixed-Price
Disaggregation Of Revenue [Line Items]
Revenue from clients									529,157	566,299	526,751
Cost-Based
Disaggregation Of Revenue [Line Items]
Revenue from clients									227,874	211,246	229,776
U.S. Federal Government
Disaggregation Of Revenue [Line Items]
Revenue from clients									666,961	560,953	546,050
U.S. State and Local Government
Disaggregation Of Revenue [Line Items]
Revenue from clients									222,730	279,833	183,900
International Government
Disaggregation Of Revenue [Line Items]
Revenue from clients									95,734	122,125	122,186
Total Government
Disaggregation Of Revenue [Line Items]
Revenue from clients									985,425	962,911	852,136
Commercial
Disaggregation Of Revenue [Line Items]
Revenue from clients									521,450	515,614	485,837
Energy, Environmental and Infrastructure
Disaggregation Of Revenue [Line Items]
Revenue from clients									616,296	663,799	564,736
Health, Education and Social Programs
Disaggregation Of Revenue [Line Items]
Revenue from clients									670,618	567,351	535,578
Safety and Security
Disaggregation Of Revenue [Line Items]
Revenue from clients									117,979	118,279	111,660
Consumer and Financial
Disaggregation Of Revenue [Line Items]
Revenue from clients									$ 101,982	$ 129,096	$ 125,999

Revenue Recognition - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue From Contract With Customer [Abstract]
Net contract assets	$ 3,605
Revenue related to contract liabilities		$ 24,700	$ 23,000

Revenue Recognition - Schedule of Changes in Contract Balances Due to Adoption of New Accounting Standards (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenue From Contract With Customer [Abstract]
Contract assets	$ 143,369	$ 142,337
Contract liabilities	(42,050)	(37,413)
Net contract assets	101,319	$ 104,924
Change in contract assets	1,032
Change in contract liabilities	(4,637)
Changes in net contract assets	$ (3,605)

Revenue Recognition - Additional Information (Detail1) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01 $ in Billions	Dec. 31, 2020 USD ($)
Revenue From Contract With Customer [Line Items]
Unfulfilled performance obligation	$ 1.7
Minimum
Revenue From Contract With Customer [Line Items]
Expected period to satisfy performance obligations	1 year
Maximum
Revenue From Contract With Customer [Line Items]
Expected period to satisfy performance obligations	2 years

Derivative Instruments and Hedging Activities - Additional Information (Details) - USD ($)
$ in Millions

12 Months Ended

Feb. 20, 2020

Aug. 08, 2018

Aug. 31, 2017

Sep. 30, 2016

^[1]

Dec. 31, 2020

Derivative [Line Items]

Estimate of time to transfer of realized losses from AOCI into earnings

12 months

Net amount of realized losses from AOCI into earnings

$ 3.0

Interest Rate Swap | Cash Flow Hedging | Designated as Hedging Instrument

Derivative [Line Items]

Aggregate notional amount

$ 100.0

$ 50.0

$ 25.0

$ 100.0

Derivative, fixed interest rate

1.294%

2.854%

1.8475%

Beginning dates of effected cash flows

Feb. 28, 2020

Aug. 31, 2018

Jan. 31, 2018

Ending dates of effected cash flows

Feb. 28, 2025

Aug. 31, 2023

Jan. 31, 2023

[1]

Derivative Instruments and Hedging Activities - Summary of Interest Rate Swaps Derivatives Designated as Cash Flow Hedges (Details) - Cash Flow Hedging - Designated as Hedging Instrument - USD ($)
$ in Millions

Feb. 20, 2020

Aug. 08, 2018

Aug. 31, 2017

Sep. 30, 2016

^[1]

Interest Rate Swap

Derivative [Line Items]

Notional Amount

$ 100.0

$ 50.0

$ 25.0

$ 100.0

Paid Fixed Interest Rate%

1.294%

2.854%

1.8475%

Beginning Dates of Effected Cash Flows

Feb. 28, 2020

Aug. 31, 2018

Jan. 31, 2018

Ending Dates of Effected Cash Flows

Feb. 28, 2025

Aug. 31, 2023

Jan. 31, 2023

Interest Rate Swap 2.8510% Paid Rate

Derivative [Line Items]

Notional Amount

$ 25.0

Paid Fixed Interest Rate%

2.851%

Beginning Dates of Effected Cash Flows

Aug. 31, 2018

Ending Dates of Effected Cash Flows

Aug. 31, 2023

[1]

Derivative Instruments and Hedging Activities - Summary of Effect of Swaps on Company's Financial Statements (Details) - Interest Rate Swaps - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Total Gain or (Loss) Recorded to AOCI	$ (9,867)	$ (3,362)
Amount of (Gain) or Loss Reclassified from AOCI into Income	$ 2,031	$ (387)

Income Taxes - Income Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Domestic	$ 68,817	$ 87,622	$ 74,479
Foreign	5,856	2,551	8,348
Income before income taxes	$ 74,673	$ 90,173	$ 82,827

Income Taxes - Income Tax Expense Components (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ 14,645	$ 14,123	$ 9,700
State	5,198	5,698	4,035
Foreign	1,736	1,537	2,418
Total current	21,579	21,358	16,153
Deferred:
Federal	(1,721)	320	4,072
State	314	(25)	1,452
Foreign	(458)	(418)	(250)
Total deferred	(1,865)	(123)	5,274
Income tax expense	$ 19,714	$ 21,235	$ 21,427

Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets
Allowance for bad debt	$ 1,687	$ 888
Accrued paid time off	2,423	1,671
Foreign net operating loss (NOL) carry forward	957	866
State net operating loss (NOL) carry forward	714	714
Stock option compensation	2,308	2,666
Deferred rent	3,091	3,129
Deferred compensation	4,598	3,902
Foreign tax credits	5,882	4,508
Foreign exchange	5,370	3,579
Foreign deferred	650	200
Accrued bonus	4,126	884
Accrued liabilities and other	5,701	4,434
Deferred Tax Assets, gross, before valuation allowance	39,615	29,467
Less: Valuation Allowance	(6,839)	(5,374)	$ (5,112)	$ (1,636)
Total Deferred Tax Assets	32,776	24,093
Deferred Tax Liabilities
Retention	(1,003)	(1,395)
Prepaid expenses	(1,089)	(1,451)
Payroll taxes	(489)	(593)
Unbilled revenue	(1,451)	(2,691)
Depreciation	(1,731)	(3,112)
Amortization	(60,392)	(52,076)
Deferred gain and other	(951)	(396)
Total Deferred Tax Liabilities	(67,106)	(61,714)
Total Net Deferred Tax Liability	(34,330)	(37,621)
State and Local Jurisdiction
Deferred Tax Assets
Tax credits	$ 2,108	$ 2,026

Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Federal corporate income tax rate	21.00%	21.00%	21.00%	35.00%
Deferred tax assets and liabilities income tax rate expected to reverse in future	26.40%
Increase in deferred tax provision for income taxes, including adjustments to valuation allowances			$ 1,000,000.0
Increase in valuation allowance	$ 1,400,000
Increase in cumulative foreign tax credit carryforward	1,400,000
Income taxes provided for additional outside basis difference inherent in entities as result of reinvestment	$ 100,000
Operating loss carryforwards expiration term	20 years
Deferred tax assets, valuation allowance	$ 6,839,000	$ 5,374,000	5,112,000	$ 1,636,000
Valuation allowance, deferred tax asset, increase (decrease), amount	1,465,000	262,000	3,476,000
Unrecognized tax benefits	811,000	0	$ 216,000	$ 820,000
Unrecognized tax benefits that would impact effective tax rate	800,000
Unrecognized tax benefits, income tax penalties and interest accrued	100,000	0
Amount of social security tax deferred payment due to CARES Act	$ 20,900,000
Percentage of social security tax payable in one year	50.00%
International government subsidy payments received	$ 3,000,000.0
Earliest Tax Year \| Internal Revenue Service (IRS)
Income Taxes [Line Items]
Open tax year	2017
Earliest Tax Year \| State and Foreign Jurisdictions
Income Taxes [Line Items]
Open tax year	2016
Latest Tax Year \| Internal Revenue Service (IRS)
Income Taxes [Line Items]
Open tax year	2019
Latest Tax Year \| State and Foreign Jurisdictions
Income Taxes [Line Items]
Open tax year	2019
Foreign Tax Authority
Income Taxes [Line Items]
Operating loss carryforwards	$ 2,500,000	2,500,000
Deferred tax assets, valuation allowance	1,000,000.0	900,000
Valuation allowance, deferred tax asset, increase (decrease), amount	5,800,000
Domestic Tax Authority
Income Taxes [Line Items]
Operating loss carryforwards	$ 7,800,000
Net operating loss carryforwards, expiration year	2034
State and Local Jurisdiction
Income Taxes [Line Items]
Tax credit carryforward, amount	$ 2,700,000
Deferred tax assets, tax credit carryforwards	$ 2,108,000	$ 2,026,000
State and Local Jurisdiction \| Earliest Tax Year
Income Taxes [Line Items]
Tax credit carryforwards, expiration year	2021
State and Local Jurisdiction \| Latest Tax Year
Income Taxes [Line Items]
Tax credit carryforwards, expiration year	2029

Income Taxes - Unrecognized Tax Benefit Reconciliation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, beginning balance	$ 0	$ 216,000	$ 820,000
Increase attributable to tax positions taken during the current period	811,000		216,000
Decrease attributable to settlements with taxing authorities			(37,000)
Decrease attributable to lapse of statute of limitations			(783,000)
Decrease attributable to tax positions taken during a prior period		(216,000)
Unrecognized tax benefits, ending balance	$ 811,000	$ 0	$ 216,000

Income Taxes - Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Taxes at statutory rate	21.00%	21.00%	21.00%	35.00%
State taxes, net of federal benefit	5.60%	5.30%	5.20%
Foreign tax rate differential	0.30%	0.30%	0.50%
Executive compensation	2.40%	0.60%	1.00%
Other permanent differences	0.10%	0.70%	0.80%
Prior year tax adjustments	(1.10%)	(1.00%)	0.20%
Unrecognized tax benefits	1.00%	(0.20%)	(0.60%)
Valuation allowance	1.60%	1.10%	1.30%
Equity-based compensation	(3.80%)	(3.60%)	(3.00%)
Tax credits	(0.70%)	(0.60%)	(0.50%)
Taxes at effective rate	26.40%	23.60%	25.90%

Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2020

Dec. 31, 2019

Dec. 31, 2018

Accumulated Other Comprehensive Income Loss [Line Items]

Balance

$ 714,551

$ 660,417

$ 616,030

Current period other comprehensive (loss) income:

Total current period other comprehensive income (loss)

(1,962)

407

(6,683)

Balance

746,961

714,551

660,417

Cumulative-Effect Adjustments for Adoption of Accounting Principle

Current period other comprehensive (loss) income:

Balance

(513)

Foreign Currency Translation Adjustments

Accumulated Other Comprehensive Income Loss [Line Items]

Balance

(10,995)

(14,168)

(7,638)

Adjusted beginning balance

(8,945)

Current period other comprehensive (loss) income:

Other comprehensive income (loss) before reclassifications

4,141

2,338

(4,711)

Amounts reclassified from accumulated other comprehensive income

^[1]

Effect of taxes

^[2]

(356)

835

(512)

Total current period other comprehensive income (loss)

3,785

3,173

(5,223)

Balance

(7,210)

(10,995)

(14,168)

Foreign Currency Translation Adjustments | Cumulative-Effect Adjustments for Adoption of Accounting Principle

Accumulated Other Comprehensive Income Loss [Line Items]

Balance

^[3]

(1,307)

Gain on Sale of Interest Rate Hedge Agreement

Accumulated Other Comprehensive Income Loss [Line Items]

Balance

^[4]

1,634

2,164

2,158

Adjusted beginning balance

^[4]

2,636

Current period other comprehensive (loss) income:

Other comprehensive income (loss) before reclassifications

^[4]

Amounts reclassified from accumulated other comprehensive income

^[4]

(720)

^[1]

(720)

(660)

Effect of taxes

^[2],[4]

182

190

188

Total current period other comprehensive income (loss)

^[4]

(538)

(530)

(472)

Balance

^[4]

1,096

1,634

2,164

Gain on Sale of Interest Rate Hedge Agreement | Cumulative-Effect Adjustments for Adoption of Accounting Principle

Accumulated Other Comprehensive Income Loss [Line Items]

Balance

^[3],[4]

478

Changes in Fair Value of Interest Rate Hedge Agreements

Accumulated Other Comprehensive Income Loss [Line Items]

Balance

^[5],[6]

(2,783)

(547)

441

Adjusted beginning balance

^[5],[6]

441

Current period other comprehensive (loss) income:

Other comprehensive income (loss) before reclassifications

^[5],[6]

(9,867)

(3,362)

(1,184)

Amounts reclassified from accumulated other comprehensive income

^[5],[6]

2,751

^[1]

333

(12)

Effect of taxes

^[2],[5],[6]

1,907

793

208

Total current period other comprehensive income (loss)

^[5],[6]

(5,209)

(2,236)

(988)

Balance

^[5],[6]

(7,992)

(2,783)

(547)

Changes in Fair Value of Interest Rate Hedge Agreements | Cumulative-Effect Adjustments for Adoption of Accounting Principle

Accumulated Other Comprehensive Income Loss [Line Items]

Balance

^[3],[5],[6]

Accumulated Other Comprehensive Loss

Accumulated Other Comprehensive Income Loss [Line Items]

Balance

(12,144)

(12,551)

(5,039)

Adjusted beginning balance

(5,868)

Current period other comprehensive (loss) income:

Other comprehensive income (loss) before reclassifications

(5,726)

(1,024)

(5,895)

Amounts reclassified from accumulated other comprehensive income

2,031

^[1]

(387)

(672)

Effect of taxes

^[2]

1,733

1,818

(116)

Total current period other comprehensive income (loss)

(1,962)

407

(6,683)

Balance

$ (14,106)

$ (12,144)

(12,551)

Accumulated Other Comprehensive Loss | Cumulative-Effect Adjustments for Adoption of Accounting Principle

Accumulated Other Comprehensive Income Loss [Line Items]

Balance

^[3]

$ (829)

[1]	The Company expects to reclassify $0.7 million related to the Gain on Sale of Interest Rate Hedge Agreement, and $3.7 million losses related to the Change in Fair Value of Interest Rate Hedge Agreement from accumulated other comprehensive loss into earnings during the next 12 months.
[2]	The Company’s effective tax rate for the years ended December 31, 2020, 2019, and 2018 was 26.4%, 23.6%, and 25.9%, respectively.
[3]	The Company has adjusted the balance of accumulated other comprehensive (loss) income at December 3, 2017 after the adoption of ASU 2018-02.
[4]	Represents the fair value of an interest rate hedge agreement, designated as a cash flow hedge, which was sold on December 1, 2016. The fair value of the interest rate hedge agreement was recorded in other comprehensive income, net of tax, and will be reclassified to earnings when earnings are impacted by the hedged items, as interest payments are made on the Credit Facility from January 31, 2018 to January 31, 2023.
[5]	Represents the change in fair value of an interest rate hedge agreements designated as a cash flow hedges. The fair value of the interest rate hedge agreement was recorded in other comprehensive income and will be reclassified to earnings when earnings are impacted by the hedged items, as interest payments are made on the Credit Facility from August 31, 2018 to February 28, 2025. See additional details of the hedge agreements in Note 12 - Derivative Instruments and Hedging Activities.
[6]	The fair value of the interest rate hedge agreements is included in other current and other long-term liabilities on the consolidated balance sheet.

Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]
Effective tax rate	26.40%	23.60%	25.90%
Expects to reclassify net gains from accumulated other comprehensive loss into earnings	$ 0.7
Expects to reclassify net losses related to change in fair value of interest rate hedge agreement from accumulated other comprehensive loss into earnings	$ 3.7

Accounting for Stock-based Compensation - Additional Information (Details) $ / shares in Units, $ in Millions		12 Months Ended
	Apr. 04, 2018 shares	Dec. 31, 2020 USD ($) PerformancePeriod $ / shares shares	Dec. 31, 2019 USD ($) PerformancePeriod shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 PerformancePeriod shares	Dec. 31, 2015 PerformancePeriod
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, options, outstanding, weighted average remaining contractual term		3 years 9 months 18 days
Share-based compensation arrangement by share-based payment award, award vesting period		3 years
Share-based compensation arrangement by share-based payment award, options, vested and expected to vest, exercisable, weighted average remaining contractual term		2 years 3 months 18 days
Share-based compensation arrangement by share-based payment award, options, exercisable, weighted average remaining contractual term		2 years 3 months 18 days
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares grants		0	0	0
Share-based compensation arrangement by share-based payment award, options, outstanding, weighted average remaining contractual term		10 years
Share price \| $ / shares		$ 74.33
Share-based compensation arrangement by share-based payment award, options, exercises in period, intrinsic value \| $		$ 5.1	$ 4.9	$ 8.3
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share price \| $ / shares		$ 74.33
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period, fair value \| $		$ 14.1	$ 7.2	$ 6.5
Number of shares, granted		170,411	159,831	235,480
Number of shares, vested		258,307	164,913	169,279
Cash Settled RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share price \| $ / shares		$ 74.33
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period, fair value \| $		$ 9.3	$ 7.2	$ 7.7
Number of shares, granted		134,259	103,606	147,103
Number of shares, vested		154,653	123,395	147,759
Non-Employee Director Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, granted				7,985
Performance Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share price \| $ / shares		$ 74.33
Number of performance period in performance based share program \| PerformancePeriod		1	2		3	2
Percentage of multiplication award by product		2.00%
Number of shares, granted		87,314	85,928	45,136	88,038
Number of shares, vested		88,038	107,000	30,576
Number of shares, granted, adjusted for partial performance periods					94,178
Number of shares, expected to vest		94,178
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected forfeiture rate		0.00%
Minimum \| Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period		3 years
Minimum \| Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period		3 years
Minimum \| Cash Settled RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period		3 years
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected forfeiture rate		17.75%
Maximum \| Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period		4 years
Maximum \| Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period		4 years
Maximum \| Cash Settled RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period		4 years
Omnibus Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares grants	1,600,000	90,742
Share-based compensation arrangement by share-based payment award, number of additional awards		0
Share-based compensation arrangement by share-based payment award, number of shares available for grant		1,107,968
Share-based compensation arrangement by share-based payment award, options, outstanding, weighted average remaining contractual term		10 years
Omnibus Plan \| Non-Employee Director Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share price \| $ / shares		$ 74.33
Number of shares, granted		12,541	9,732	11,606
Number of shares, vested		10,891	9,840	5,395

Accounting for Stock-based Compensation - Schedule of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-Based Compensation Recognized	$ 24,570	$ 26,031	$ 19,581
Stock-Based Compensation Unrecognized	22,077
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-Based Compensation Recognized	11,895	10,644	7,410
Stock-Based Compensation Unrecognized	$ 10,777
Stock-Based Compensation Unrecognized Weighted- Average Period to Recognize (Year)	1 year 8 months 12 days
Cash Settled RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-Based Compensation Recognized	$ 7,015	10,213	8,214
Stock-Based Compensation Unrecognized	$ 8,688
Stock-Based Compensation Unrecognized Weighted- Average Period to Recognize (Year)	1 year 6 months
Non-Employee Director Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-Based Compensation Recognized	$ 755	719	764
Stock-Based Compensation Unrecognized	$ 383
Stock-Based Compensation Unrecognized Weighted- Average Period to Recognize (Year)	4 months 24 days
Performance Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-Based Compensation Recognized	$ 4,905	$ 4,455	$ 3,193
Stock-Based Compensation Unrecognized	$ 2,229
Stock-Based Compensation Unrecognized Weighted- Average Period to Recognize (Year)	1 year 6 months

Accounting for Stock-based Compensation - Outstanding Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Outstanding Ending Balance	38,227
Number of Shares, Exercisable at December 31, 2020	38,227
Weighted Average Exercise Price, Exercisable at December 31, 2020	$ 31.93
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Outstanding Beginning Balance	108,128	201,810	411,498
Number of Shares, Exercised	(69,901)	(93,682)	(209,688)
Number of Shares, Granted	0	0	0
Number of Shares, Outstanding Ending Balance	38,227	108,128	201,810
Number of Shares, Vested plus expected to vest at December 31, 2020	38,227
Number of Shares, Exercisable at December 31, 2020	38,227
Weighted Average Exercise Price, Outstanding Beginning Balance	$ 35.82	$ 33.68	$ 30.71
Weighted Average Exercise Price, Exercised	37.94	31.21	27.86
Weighted Average Exercise Price, Outstanding Ending Balance	31.93	$ 35.82	$ 33.68
Weighted Average Exercise Price, Vested plus expected to vest at December 31, 2020	31.93
Weighted Average Exercise Price, Exercisable at December 31, 2020	$ 31.93
Aggregate Intrinsic Value, Outstanding at December 31,2020	$ 1,620,688
Aggregate Intrinsic Value, Vested plus expected to vest at December 31, 2020	1,620,688
Aggregate Intrinsic Value, Exercisable at December 31, 2020	$ 1,620,688

Accounting for Stock-based Compensation - Stock Options Outstanding by Exercise Price Range (Details)	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Lower range	$ 21.77
Range of Exercise Prices, Upper range	$ 41.00
Number Outstanding \| shares	38,227
Weighted Average Remaining Contractual Term	3 years 9 months 18 days
Number Exercisable \| shares	38,227
Weighted Average Exercise Price	$ 31.93
Price Range 1
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Lower range	21.77
Range of Exercise Prices, Upper range	$ 25.00
Number Outstanding \| shares	1,915
Weighted Average Remaining Contractual Term	3 months 18 days
Weighted Average Exercise Price	$ 21.77
Number Exercisable \| shares	1,915
Weighted Average Exercise Price	$ 21.77
Price Range 2
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Lower range	25.01
Range of Exercise Prices, Upper range	$ 27.00
Number Outstanding \| shares	6,332
Weighted Average Remaining Contractual Term	1 year 2 months 12 days
Weighted Average Exercise Price	$ 25.66
Number Exercisable \| shares	6,332
Weighted Average Exercise Price	$ 25.66
Price Range 3
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Lower range	27.01
Range of Exercise Prices, Upper range	$ 40.00
Number Outstanding \| shares	14,874
Weighted Average Remaining Contractual Term	2 years 2 months 12 days
Weighted Average Exercise Price	$ 27.03
Number Exercisable \| shares	14,874
Weighted Average Exercise Price	$ 27.03
Price Range 4
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Lower range	40.01
Range of Exercise Prices, Upper range	$ 41.00
Number Outstanding \| shares	15,106
Weighted Average Remaining Contractual Term	3 years 2 months 12 days
Weighted Average Exercise Price	$ 40.68
Number Exercisable \| shares	15,106
Weighted Average Exercise Price	$ 40.68

Accounting for Stock-based Compensation - Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Non-vested Beginning Balance	449,975	474,240	463,587
Number of Shares, Granted	170,411	159,831	235,480
Number of Shares, Vested	(258,307)	(164,913)	(169,279)
Number of Shares, Cancelled	(56,680)	(19,183)	(55,548)
Number of Shares, Non-vested Ending Balance	305,399	449,975	474,240
Number of Shares, expected to vest in the future	279,087
Weighted-Average Grant Date Fair Value, Non-vested Beginning Balance	$ 62.48	$ 50.93	$ 38.71
Weighted-Average Grant Date Fair Value, Granted	58.27	77.74	65.37
Weighted-Average Grant Date Fair Value, Vested	54.73	43.82	38.66
Weighted-Average Grant Date Fair Value, Cancelled	63.46	56.18	47.50
Weighted-Average Grant Date Fair Value, Non-vested Ending Balance	66.51	$ 62.48	$ 50.93
Weighted-Average Grant Date Fair Value, expected to vest in the future	$ 66.69
Aggregate Intrinsic Value, Non-vested	$ 22,700,308
Aggregate Intrinsic Value, expected to vest in the future	$ 20,744,537

Accounting for Stock-based Compensation - Cash-settled Restricted Stock Unit Activity (Details) - Cash Settled RSUs - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Non-vested Beginning Balance	296,233	337,406	391,916
Number of Shares, Granted	134,259	103,606	147,103
Number of Shares, Vested	(154,653)	(123,395)	(147,759)
Number of Shares, Cancelled	(34,358)	(21,384)	(53,854)
Number of Shares, Non-vested Ending Balance	241,481	296,233	337,406
Number of Shares, expected to vest in the future	213,305
Weighted-Average Grant Date Fair Value, Non-vested Beginning Balance	$ 58.83	$ 47.73	$ 38.80
Weighted-Average Grant Date Fair Value, Granted	60.30	77.03	60.84
Weighted-Average Grant Date Fair Value, Vested	49.44	44.61	38.71
Weighted-Average Grant Date Fair Value, Cancelled	63.03	53.99	43.07
Weighted-Average Grant Date Fair Value, Non-vested Ending Balance	65.06	$ 58.83	$ 47.73
Weighted-Average Grant Date Fair Value, expected to vest in the future	$ 65.17
Aggregate Intrinsic Value, Non-vested	$ 17,949,283,000
Aggregate Intrinsic Value, expected to vest in the future	$ 15,854,961,000

Accounting for Stock-based Compensation - Summary of Non-employee Director Awards of Unregistered Shares Granted (Details) - Non-Employee Director Awards	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Granted \| shares	7,985
Weighted- Average Grant Date Fair Value \| $ / shares	$ 60.36

Accounting for Stock-based Compensation - Summary of Non-employee Director Awards Activity (Details) - Non-Employee Director Awards - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Granted			7,985
Weighted-Average Grant Date Fair Value, Granted			$ 60.36
Omnibus Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Non-vested Beginning Balance	4,860	4,968
Number of Shares, Granted	12,541	9,732	11,606
Number of Shares, Vested	(10,891)	(9,840)	(5,395)
Number of Shares, Cancelled			(1,243)
Number of Shares, Non-vested Ending Balance	6,510	4,860	4,968
Number of Shares, expected to vest in the future	6,510
Weighted-Average Grant Date Fair Value, Non-vested Beginning Balance	$ 73.94	$ 72.35
Weighted-Average Grant Date Fair Value, Granted	64.58	73.94	$ 72.35
Weighted-Average Grant Date Fair Value, Vested	68.82	73.14	72.35
Weighted-Average Grant Date Fair Value, Cancelled			72.35
Weighted-Average Grant Date Fair Value, Non-vested Ending Balance	64.47	$ 73.94	$ 72.35
Weighted-Average Grant Date Fair Value, expected to vest in the future	$ 64.47
Aggregate Intrinsic Value, Non-vested	$ 483,888
Aggregate Intrinsic Value, expected to vest in the future	$ 483,888

Accounting for Stock-based Compensation - Summary of Performance Shares Activity (Details) - Performance Shares - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of Shares
Number of Shares, Non-vested Beginning Balance	148,414	169,486	187,022
Number of Shares, Granted	87,314	85,928	45,136	88,038
Number of Shares, Vested	(88,038)	(107,000)	(30,576)
Number of Shares, Cancelled	(5,569)		(32,096)
Number of Shares, Non-vested Ending Balance	142,121	148,414	169,486	187,022
Number of Shares, expected to vest in the future	94,178
Weighted-Average Grant Date Fair Value
Weighted-Average Grant Date Fair Value, Non-vested Beginning Balance	$ 60.67	$ 45.15	$ 39.95
Weighted-Average Grant Date Fair Value, Granted	51.44	62.07	65.05
Weighted-Average Grant Date Fair Value, Vested	38.81	37.21	44.21
Weighted-Average Grant Date Fair Value, Cancelled	69.66		43.72
Weighted-Average Grant Date Fair Value, Non-vested Ending Balance	68.19	$ 60.67	$ 45.15	$ 39.95
Weighted-Average Grant Date Fair Value, expected to vest in the future	$ 69.76
Aggregate Intrinsic Value
Aggregate Intrinsic Value, Non-vested	$ 10,563,854
Aggregate Intrinsic Value, expected to vest in the future	$ 7,000,251

Accounting for Stock-based Compensation - Schedule of Fair Value Assumptions using Monte Carlo Simulation Model for Awards Granted (Details) - Performance Shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Dividend Yield	1.00%	0.70%	0.90%
Historical Volatility	35.70%	29.30%	31.90%
Risk-Free Rate of Returns	0.40%	2.40%	2.40%

Business Combinations - Additional Information (Details) - ITG - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Jan. 31, 2020	Dec. 31, 2022	Jun. 30, 2020	Dec. 31, 2020
Business Acquisition [Line Items]
Business acquisition date	Jan. 31, 2020
Purchase price acquisition	$ 255,000
Purchase price allocated to intangibles	235,600
Goodwill resulting from business combination	$ 188,300			$ 188,253
Amortization of goodwill and other intangibles amortized for income tax purpose period	15 years
Warrant
Business Acquisition [Line Items]
Purchase price acquisition			$ 1,900
Percentage of fair value acquisition discounting liabilities	3.00%
Indemnity
Business Acquisition [Line Items]
Percentage of fair value acquisition discounting liabilities	3.25%
Indemnity \| Forecast
Business Acquisition [Line Items]
Purchase price acquisition		$ 1,200
Other Intangible Assets
Business Acquisition [Line Items]
Purchase price allocated to intangibles	$ 47,300

Earnings Per Share - Additional Information (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share, amount	1,879	2,822	20,291

Earnings Per Share - Schedule of Dilutive Effect of Stock Options RSUs and PSAs (Details) - shares shares in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Basic weighted-average shares outstanding	18,841	18,853	18,829	18,840	18,834	18,799	18,805	18,825	18,841	18,816	18,797
Effect of potential exercise of stock options, RSUs, and PSAs									294	408	538
Diluted weighted-average shares outstanding	19,143	19,086	19,020	19,197	19,234	19,169	19,133	19,263	19,135	19,224	19,335

Share Repurchase Program - Additional Information (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) shares
Equity [Abstract]
Stock repurchase program, authorized amount	$ 100,000,000.0
Line of credit facility, condition permitted for unlimited share repurchases, leverage ratio	3.50
Stock Repurchased During Period, Shares \| shares	278,582
Stock Repurchased During Period, Value	$ 21,900,000
Stock repurchase program, remaining authorized repurchase amount	$ 46,100,000

Fair Value - Schedule of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - Fair Value, Recurring - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets:
Assets, Total	$ 16,899	$ 15,753
Liabilities:
Liabilities, Total	28,203	18,666
Forward Contract Agreements \| Prepaid Expenses and Other
Assets:
Assets, Total	103	733
Deferred Compensation Investments in Cash Surrender Life Insurance \| Other Assets
Assets:
Assets, Total	16,796	15,020
Deferred Compensation Plan Liabilities \| Other Long-Term Liabilities
Liabilities:
Liabilities, Total	17,276	14,855
Interest Rate Swap \| Other Long-Term Liabilities
Liabilities:
Liabilities, Total	7,234	2,742
Interest Rate Swap \| Accrued Expenses and Other Current Liabilities
Liabilities:
Liabilities, Total	3,693	1,069
Level 2
Assets:
Assets, Total	16,899	15,753
Liabilities:
Liabilities, Total	28,203	18,666
Level 2 \| Forward Contract Agreements \| Prepaid Expenses and Other
Assets:
Assets, Total	103	733
Level 2 \| Deferred Compensation Investments in Cash Surrender Life Insurance \| Other Assets
Assets:
Assets, Total	16,796	15,020
Level 2 \| Deferred Compensation Plan Liabilities \| Other Long-Term Liabilities
Liabilities:
Liabilities, Total	17,276	14,855
Level 2 \| Interest Rate Swap \| Other Long-Term Liabilities
Liabilities:
Liabilities, Total	7,234	2,742
Level 2 \| Interest Rate Swap \| Accrued Expenses and Other Current Liabilities
Liabilities:
Liabilities, Total	$ 3,693	$ 1,069

Commitment and Contingencies - Additional Information (Details) - USD ($) $ in Millions			12 Months Ended
	Nov. 15, 2020	Jun. 10, 2016	Dec. 31, 2020
Loss Contingencies [Line Items]
Community development related to claim			$ 220.2
Executive Chair
Loss Contingencies [Line Items]
Severance costs	$ 1.8
Compensation arrangement annual incentive bonus	0.9
Compensation related cost employee welfare benefit	$ 0.1
Executive Chair \| Restricted Stock Units (RSUs)
Loss Contingencies [Line Items]
Restricted shares vested under severance agreement			50,818
Shares repurchased for tax withholding for share based compensation			24,550
Executive Chair \| Performance Shares
Loss Contingencies [Line Items]
Shares granted vested and accelerated			50,112
OCD vs ICF Emergency
Loss Contingencies [Line Items]
Loss contingency damages sought value		$ 200.8
Road Home Contract
Loss Contingencies [Line Items]
Contract term, period		3 years
Contract award, value		$ 912.0

Employee Benefit Plans - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Maximum defer of compensation subject to statutory limitations, percentage	70.00%
Percentage of employer matching contributions condition, one	100.00%
Percentage of employee entitled to employer matching contribution condition, one	3.00%
Percentage of employer matching contributions condition, two	50.00%
Percentage of employee entitled to employer matching contribution condition, two	2.00%
Defined contribution plan, employer discretionary contribution amount	$ 18,100,000	$ 17,300,000	$ 16,200,000
Deferred compensation arrangement with individual, cash awards granted, percentage	80.00%
Deferred compensation on performance bonuses that eligible employee, percentage	100.00%
Defined contribution plan, employers matching contribution, annual vesting percentage	100.00%
Employee stock purchase plan shares authorized	1,000,000
Employee stock purchase plan annual maximum payroll deduction	$ 25,000
Share-based compensation arrangement by share-based payment award, discount from market price, purchase date	5.00%
Stock issued during period, shares, employee stock purchase plans	31,744	23,636
Stock issued during period, value, employee stock purchase plans, per share	$ 64.77	$ 78.05
Employee stock purchase plan, number of shares available for grant	647,126	678,870

Subsequent Events - Additional Information (Details) - Subsequent Event	Feb. 25, 2021 $ / shares
Subsequent Event [Line Items]
Dividend declaration date	Feb. 25, 2021
Cash dividend per share	$ 0.14
Dividend payment date	Apr. 13, 2021
Dividend record date	Mar. 26, 2021

Supplemental Information - Schedule of Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance For Doubtful Accounts Receivable Rollforward
Balance at beginning of period	$ 3,506	$ 5,284	$ 3,853
Bad debt expense	4,062	624	2,480
Write-offs, net of recoveries	(41)	(2,403)	(1,027)
Effect of foreign currency translation	89	1	(22)
Balance at end of period	$ 7,616	$ 3,506	$ 5,284

Supplemental Information - Schedule of Income Tax Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Valuation Allowance [Abstract]
Balance at beginning of period	$ 5,374	$ 5,112	$ 1,636
Provision for income taxes - valuation allowance	1,465	262	3,476
Balance at end of period	$ 6,839	$ 5,374	$ 5,112

Selected Quarterly Financial Data (Unaudited)- Quarterly Financial Data (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 434,335	$ 360,315	$ 353,987	$ 358,238	$ 396,636	$ 373,918	$ 366,717	$ 341,254	$ 1,506,875	$ 1,478,525	$ 1,337,973
Operating income	21,758	28,250	22,782	16,319	28,298	28,664	22,542	21,889	89,109	101,393	92,272
Net income	$ 12,820	$ 17,871	$ 13,656	$ 10,612	$ 19,379	$ 19,630	$ 14,611	$ 15,318	$ 54,959	$ 68,938	$ 61,400
Earnings per share:
Basic	$ 0.68	$ 0.95	$ 0.73	$ 0.56	$ 1.03	$ 1.04	$ 0.78	$ 0.81	$ 2.92	$ 3.66	$ 3.27
Diluted	$ 0.67	$ 0.94	$ 0.72	$ 0.55	$ 1.01	$ 1.02	$ 0.76	$ 0.80	$ 2.87	$ 3.59	$ 3.18
Weighted-average common shares outstanding
Basic	18,841	18,853	18,829	18,840	18,834	18,799	18,805	18,825	18,841	18,816	18,797
Diluted	19,143	19,086	19,020	19,197	19,234	19,169	19,133	19,263	19,135	19,224	19,335
Cash dividends declared per common share	$ 0.14	$ 0.14	$ 0.14	$ 0.14	$ 0.14	$ 0.14	$ 0.14	$ 0.14	$ 0.56	$ 0.56	$ 0.56