0001564590-21-023591 | 10-Q | XBRL Viewer

Document And Entity Information - shares	3 Months Ended
Document And Entity Information - shares	Mar. 31, 2021	Apr. 30, 2021
Cover [Abstract]
Entity Registrant Name	ICF International, Inc.
Entity Central Index Key	0001362004
Trading Symbol	ICFI
Security Exchange Name	NASDAQ
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		18,837,808
Document Type	10-Q
Document Period End Date	Mar. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	001-33045
Entity Tax Identification Number	22-3661438
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
Entity Interactive Data Current	Yes
Document Quarterly Report	true
Document Transition Report	false

CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($)
$ in Thousands

Mar. 31, 2021

Dec. 31, 2020

Current Assets:

Cash and cash equivalents

$ 8,592

$ 13,841

Restricted cash

^[1]

42,231

68,146

Contract receivables, net

214,291

222,850

Contract assets

164,155

143,369

Prepaid expenses and other assets

22,115

25,492

Income tax receivable

1,977

Total Current Assets

451,384

475,675

Property and Equipment, net

60,294

62,434

Other Assets:

Goodwill

910,359

909,913

Other intangible assets, net

56,900

59,887

Operating lease - right-of-use assets

119,250

127,132

Other assets

32,572

32,249

Total Assets

1,630,759

1,667,290

Current Liabilities:

Current portion of long-term debt

10,000

Accounts payable

90,894

91,365

Contract liabilities

43,589

42,050

Operating lease liabilities - current

28,881

23,350

Accrued salaries and benefits

85,134

80,512

Accrued subcontractors and other direct costs

45,110

78,842

Accrued expenses and other current liabilities

77,318

100,908

Income taxes payable

2,402

Total Current Liabilities

383,328

427,027

Long-term Liabilities:

Long-term debt

314,451

303,214

Operating lease liabilities - non-current

106,551

115,614

Deferred income taxes

36,966

34,330

Other long-term liabilities

38,230

40,144

Total Liabilities

879,526

920,329

Commitments and Contingencies (Note 18)

Stockholders’ Equity:

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

Common stock, par value $.001; 70,000,000 shares authorized; 23,461,587 and 23,305,255 shares issued at March 31, 2021 and December 31, 2020, respectively; 18,859,608 and 18,909,983 shares outstanding at March 31, 2021 and December 31, 2020, respectively

Additional paid-in capital

372,420

369,058

Retained earnings

604,441

588,731

Treasury stock, 4,601,979 and 4,395,272 shares at March 31, 2021 and December 31, 2020, respectively

(214,325)

(196,745)

Accumulated other comprehensive loss

(11,326)

(14,106)

Total Stockholders’ Equity

751,233

746,961

Total Liabilities and Stockholders’ Equity

$ 1,630,759

$ 1,667,290

[1]

Under a contract with a customer commencing in the fourth 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 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 and recorded in restricted cash and accrued expenses and other current liabilities rather than receipts for the provision of goods or services. Therefore, these cash receipts are presented in the consolidated statements 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.”

CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - $ / shares	Mar. 31, 2021	Dec. 31, 2020
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)	23,461,587	23,305,255
Common stock, outstanding (in shares)	18,859,608	18,909,983
Treasury stock, shares (in shares)	4,601,979	4,395,272

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Revenue	$ 378,478	$ 358,238
Direct costs	232,082	230,616
Operating costs and expenses:
Indirect and selling expenses	109,982	103,271
Depreciation and amortization	5,270	5,179
Amortization of intangible assets	3,015	2,853
Total operating costs and expenses	118,267	111,303
Operating income	28,129	16,319
Interest expense	(2,683)	(3,525)
Other (expense) income	(417)	190
Income before income taxes	25,029	12,984
Provision for income taxes	6,678	2,372
Net income	$ 18,351	$ 10,612
Earnings per Share:
Basic	$ 0.97	$ 0.56
Diluted	$ 0.96	$ 0.55
Weighted-average Shares:
Basic	18,885	18,840
Diluted	19,118	19,197
Cash dividends declared per common share	$ 0.14	$ 0.14
Other comprehensive income (loss), net of tax	$ 2,780	$ (11,123)
Comprehensive income (loss), net of tax	$ 21,131	$ (511)

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash Flows from Operating Activities
Net income	$ 18,351	$ 10,612
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	5,334	444
Deferred income taxes	1,838	4,756
Non-cash equity compensation	3,275	3,826
Depreciation and amortization	8,285	8,032
Non-cash lease expense	(1,143)	(418)
Facilities consolidation reserve	(75)	(71)
Amortization of debt issuance costs	155	246
Impairment of long-lived assets	303
Other adjustments, net	457	(348)
Changes in operating assets and liabilities, net of the effects of acquisitions:
Net contract assets and liabilities	(19,750)	(17,349)
Contract receivables	2,531	40,488
Prepaid expenses and other assets	2,016	(1,070)
Accounts payable	(354)	(49,200)
Accrued salaries and benefits	4,715	4,453
Accrued subcontractors and other direct costs	(33,466)	(10,326)
Accrued expenses and other current liabilities	8,303	(5,835)
Income tax receivable and payable	3,924	(2,996)
Other liabilities	262	(476)
Net Cash Provided by (Used in) Operating Activities	4,961	(15,232)
Cash Flows from Investing Activities
Capital expenditures for property and equipment and capitalized software	(3,595)	(4,704)
Payments for business acquisitions, net of cash acquired		(253,021)
Net Cash Used in Investing Activities	(3,595)	(257,725)
Cash Flows from Financing Activities
Advances from working capital facilities	185,755	744,331
Payments on working capital facilities	(174,674)	(389,776)
Receipt of restricted contract funds	451
Payment of restricted contract funds	(27,081)
Debt issue costs		(2,081)
Proceeds from exercise of options	2,702	37
Dividends paid	(2,642)	(2,639)
Net payments for stock issuances and buybacks	(17,104)	(23,998)
Payments on business acquisition liabilities	(682)
Net Cash (Used in) Provided by Financing Activities	(33,275)	325,874
Effect of Exchange Rate Changes on Cash, Cash Equivalents, and Restricted Cash	745	(738)
(Decrease) Increase in Cash, Cash Equivalents, and Restricted Cash	(31,164)	52,179
Cash, Cash Equivalents, and Restricted Cash, Beginning of Period	81,987	6,482
Cash, Cash Equivalents, and Restricted Cash, End of Period	50,823	58,661
Supplemental Disclosure of Cash Flow Information
Interest	2,637	3,892
Income taxes	$ 961	$ 895

Basis of Presentation and Nature of Operations

3 Months Ended

Mar. 31, 2021

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. and its subsidiaries (collectively, the “Company”), and have been prepared in accordance with United States (“U.S.”) generally accepted accounting principles (“U.S. GAAP”). 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 services. 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, banks and other financial services companies, transportation, travel and hospitality firms, non-profits/associations, law firms, 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. The Company maintains additional offices throughout the world, including more than 56 offices in the U.S. and U.S. territories and 22 offices in key markets outside the U.S., including offices in the United Kingdom, Belgium, China, India, and Canada.

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 assets and 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.

Interim Results

The unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). These rules and regulations permit some of the information and footnote disclosures normally included in financial statements, prepared in accordance with U.S. GAAP, to be condensed or omitted. In management’s opinion, the unaudited consolidated financial statements contain all adjustments that are of a normal recurring nature, necessary for a fair presentation of the results of operations and financial position of the Company for the interim periods presented. The Company reports operating results and financial data in one operating segment and reporting unit. Operating results for the three months periods ended March 31, 2021 and 2020 are not necessarily indicative of the results that may be expected for the full year. These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements for the fiscal year ended December 31, 2020 and the notes thereto included in the Company’s Annual Report on Form 10-K, filed with the SEC on February 26, 2021 (the “Annual Report”).

Reclassifications

The Company has reclassified non-cash lease expense, previously part of “Other adjustments, net,” on the consolidated statements of cash flows for the three months ended March 31, 2020 for consistency of presentation.

Recent Accounting Pronouncements

Recent Accounting Pronouncements Not Yet Adopted

Reference Rate Reform

In March 2020, the Financial Accounting Standards Board issued Accounting Standards Update 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 this guidance may have on its consolidated financial statements.

Restricted Cash

3 Months Ended

Mar. 31, 2021

Cash And Cash Equivalents [Abstract]

Restricted Cash

NOTE 2 – RESTRICTED CASH

The following table provides a reconciliation of cash and cash equivalents and restricted cash reported within the consolidated balance sheets for the periods presented to the total of cash, cash equivalents, and restricted cash shown in the consolidated statements of cash flows for the three months ended March 31, 2021 and 2020:

	2021				2020
	Beginning		Ending		Beginning		Ending
Cash and cash equivalents	$	13,841	$	8,592	$	6,482	$	58,661
Restricted cash ⁽¹⁾		68,146		42,231		—		—
Total of cash, cash equivalents, and restricted cash shown in the consolidated statements of cash flows	$	81,987	$	50,823	$	6,482	$	58,661

(1)

Contract Receivables, Net

3 Months Ended

Mar. 31, 2021

Receivables [Abstract]

Contract Receivables, Net

NOTE 3 – CONTRACT RECEIVABLES, NET

Contract receivables, net consisted of the following:

	March 31, 2021			December 31, 2020
Billed and billable	$	226,955		$	230,466
Allowance for expected credit losses		(12,664	)		(7,616	)
Contract receivables, net	$	214,291		$	222,850

Goodwill

3 Months Ended

Mar. 31, 2021

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill

NOTE 4 – GOODWILL

The changes in the carrying amount of goodwill during the three-months period ended March 31, 2021 were as follows:

Balance as of December 31, 2020	$	909,913
Effect of foreign currency translation		446
Balance as of March 31, 2021	$	910,359

Leases

3 Months Ended

Mar. 31, 2021

Leases [Abstract]

Leases

NOTE 5 – 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 March 31, 2021:

	March 31, 2021			December 31, 2020
Real estate facilities	$	156,641		$	157,010
Office equipment		1,866			1,864
Other		604			580
		159,111			159,454
Amortization of right-of-use assets		(39,861	)		(32,322	)
Total operating lease right-of-use assets	$	119,250		$	127,132

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

	Three Months Ended
	March 31, 2021		March 31, 2020
Operating lease costs	$	8,793	$	9,326
Short-term lease costs		131		431
Variable lease costs		10		1
Total rent expense	$	8,934	$	9,758

Future minimum lease payments under non-cancellable leases as of March 31, 2021 were as follows:

March 31, 2022	$	32,630
March 31, 2023		33,971
March 30, 2024		20,613
March 30, 2025		15,753
March 30, 2026		13,255
Thereafter		34,066
Total future minimum lease payments		150,288
Less: Interest		(14,856	)
Total operating lease liabilities	$	135,432

Operating lease liabilities - current	$	28,881
Operating lease liabilities - non-current		106,551
Total operating lease liabilities	$	135,432

Other information related to operating leases is as follows:

	March 31, 2021			March 31, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	3,957		$	9,526
Right-of-use assets obtained in exchange for operating lease liabilities	$	142		$	21,098
Weighted-average remaining lease term - operating leases		5.8			6.0
Weighted-average discount rate - operating leases		3.4	%		3.6	%

At March 31, 2021, the Company had an additional operating lease that had not yet commenced with a potential lease liability of $115.3 million. The operating lease has a term of 18 years and is anticipated to commence on March 1, 2022, when the Company takes possession of the property upon completion of buildouts.

Long-Term Debt

3 Months Ended

Mar. 31, 2021

Debt Disclosure [Abstract]

Long-Term Debt

NOTE 6 – LONG-TERM DEBT

At March 31, 2021 and December 31, 2020, debt consisted of:

	March 31, 2021				December 31, 2020
	Average Interest Rate	Outstanding Balance			Average Interest Rate	Outstanding Balance
Term Loan		$	190,000			$	192,500
Revolving Credit			136,863				123,281
Total before debt issuance costs	1.88%		326,863		2.35%		315,781
Unamortized debt issuance costs			(2,412	)			(2,567	)
		$	324,451			$	313,214

Current portion of long-term debt		$	10,000			$	10,000
Long-term debt - non-current			314,451				303,214
		$	324,451			$	313,214

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 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 between 1.00% and 2.00% based on its Leverage Ratio (as defined under the Credit Facility). 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 Rate is to be paid in quarterly installments. The Credit Facility also 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 is subject to a commitment fee between 0.13% and 0.25% per annum based on the Leverage Ratio.

The Credit Facility is collateralized by substantially all 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 March 31, 2021, the Company 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 it remains in compliance with the financial covenants set forth in the Credit Facility.

As of March 31, 2021, the Company had $326.9 million long-term debt outstanding from the Credit Facility (including the term loan, exclusive of unamortized debt issuance costs), outstanding letters of credit totaling $3.3 million, net derivative obligations of $6.7 million and unused borrowing capacity of $459.9 million under the Credit Facility (excluding the Accordion). Taking into account the financial, performance-based limitations, available borrowing capacity (excluding the Accordion and the term loan) was $265.5 million as of March 31, 2021.

Future scheduled repayments of debt principal are as follows:

Payments due by	Term Loan		Revolving Credit		Total
March 31, 2022	$	10,000	$	—	$	10,000
March 31, 2023		10,000		—		10,000
March 31, 2024		15,000		—		15,000
March 3, 2025 (Maturity)		155,000		136,863		291,863
Total	$	190,000	$	136,863	$	326,863

Revenue Recognition

3 Months Ended

Mar. 31, 2021

Revenue From Contract With Customer [Abstract]

Revenue Recognition

NOTE 7 – 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 from being 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.

Changes in the three months ended March 31, 2021 compared to the prior year period were primarily from an increase of revenue in the energy, environment, and infrastructure client market and the health, education, and social programs client market as a result of U.S. government clients and international government clients, partially offset by decreases in revenue from the consumer and financial markets primarily as a result of commercial clients.

	Three Months Ended March 31,
	2021					2020
	Dollars		Percent			Dollars		Percent
Client Markets:
Energy, environment, and infrastructure	$	164,492		43	%	$	148,961		42	%
Health, education, and social programs		157,765		42	%		151,352		42	%
Safety and security		31,198		8	%		30,301		8	%
Consumer and financial services		25,023		7	%		27,624		8	%
Total	$	378,478		100	%	$	358,238		100	%

	Three Months Ended March 31,
	2021					2020
	Dollars		Percent			Dollars		Percent
Client Type:
U.S. federal government	$	175,913		46	%	$	155,604		43	%
U.S. state and local government		57,152		15	%		60,893		17	%
International government		37,061		10	%		22,801		7	%
Total Government		270,126		71	%		239,298		67	%
Commercial		108,352		29	%		118,940		33	%
Total	$	378,478		100	%	$	358,238		100	%

	Three Months Ended March 31,
	2021					2020
	Dollars		Percent			Dollars		Percent
Contract Mix:
Time-and-materials	$	160,009		42	%	$	168,070		47	%
Fixed price		147,296		39	%		133,204		37	%
Cost-based		71,173		19	%		56,964		16	%
Total	$	378,478		100	%	$	358,238		100	%

Contract Balances:

Contract assets consist primarily of unbilled amounts resulting from long-term contracts when revenue recognized exceeds the amount billed often due to billing schedule timing. Contract liabilities result from advance payments received on a contract or from billings in excess of revenue recognized on long-term contracts due to billing schedule timing. The net contract assets (liabilities) as of March 31, 2021 increased by $19.2 million as compared to December 31, 2020. The increase in net contract assets (liabilities) is primarily due to an increase in work in the energy, environmental, and infrastructure client market and health, education, and social programs client market, offset by decreases in work in the consumer and financial market. There were no material changes to contract balances due to impairments during the period. During the three months ended March 31, 2021 and 2020, the Company recognized $15.1 million and $17.3 million in revenue related to the contract liabilities balance at December 31, 2020 and 2019, respectively.

	March 31, 2021			December 31, 2020			$ Change			% Change
Contract assets	$	164,155		$	143,369		$	20,786			14.5	%
Contract liabilities		(43,589	)		(42,050	)		(1,539	)		3.7	%
Net contract assets (liabilities)	$	120,566		$	101,319		$	19,247			19.0	%

Performance Obligations:

The Company had $1.6 billion in unfulfilled performance obligations as of March 31, 2021 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

3 Months Ended

Mar. 31, 2021

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivative instruments and Hedges Activities

NOTE 8 – DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

The Company manages its risk to changes in interest rates through the use of derivative instruments. The Company does not hold derivative instruments for trading or speculative purposes. For variable rate borrowings, the Company uses fixed interest rate swaps, effectively converting a portion of the variable interest rate payments to fixed interest rate payments. These swaps are designated as cash flow hedges.

A summary of interest rate swap derivatives designated as cash flow hedges as of March 31, 2021 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.

Income Taxes

3 Months Ended

Mar. 31, 2021

Income Tax Disclosure [Abstract]

Income Taxes

NOTE 9 – INCOME TAXES

The Company’s effective tax rate for the three months ended March 31, 2021 and 2020 was 26.7% and 18.3%, respectively.

The Company is subject to federal income tax as well as taxes in various state, local and foreign jurisdictions. Tax statutes and regulations within each jurisdiction are subject to interpretation and require the application of significant judgment. The Company’s 2017 through 2019 tax years remain subject to examination by the Internal Revenue Service for federal tax purposes. Certain significant state, local and foreign tax returns also remain open under the applicable statute of limitations and are subject to examination for the tax years from 2016 to 2019.

As of March 31, 2021, unrecognized tax benefits was $0.7 million, which includes $0.7 million of tax positions that, if recognized, would impact the effective tax rate. As of March 31, 2020, there were no unrecognized tax benefits, or tax positions that, if recognized, would impact the effect tax rate.

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 did not have any accrued penalty and interest at March 31, 2021 and 2020, respectively.

The Company has made no provision for deferred U.S. income taxes or additional foreign taxes on future unremitted earnings of its controlled foreign subsidiaries because the Company considers these earnings to be permanently invested.

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. 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 sheets.

- 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

3 Months Ended

Mar. 31, 2021

Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]

Accumulated Other Comprehensive Loss

NOTE 10 – ACCUMULATED OTHER COMPREHENSIVE LOSS

Accumulated other comprehensive loss as of March 31, 2021 and 2020 included the following:

	Three Months Ended March 31, 2021
	Foreign Currency Translation Adjustments			Gain on Sale of Interest Rate Hedge Agreement ⁽¹⁾			Change in Fair Value of Interest Rate Hedge Agreements ⁽²⁾			Total
Accumulated other comprehensive (loss) income at December 31, 2020	$	(7,210	)	$	1,096		$	(7,992	)	$	(14,106	)
Current period other comprehensive (loss) income:
Other comprehensive income before reclassifications		968			—			1,882			2,850
Amounts reclassified from accumulated other comprehensive income ⁽³⁾		—			(180	)		907			727
Effect of taxes⁽⁴⁾		(104	)		49			(742	)		(797	)
Total current period other comprehensive (loss) income		864			(131	)		2,047			2,780
Accumulated other comprehensive (loss) income at March 31, 2021	$	(6,346	)	$	965		$	(5,945	)	$	(11,326	)

	Three Months Ended March 31, 2020
	Foreign Currency Translation Adjustments			Gain on Sale of Interest Rate Hedge Agreement ⁽¹⁾			Change in Fair Value of Interest Rate Hedge Agreement ⁽²⁾			Total
Accumulated other comprehensive (loss) income at December 31, 2019	$	(10,995	)	$	1,634		$	(2,783	)	$	(12,144	)
Current period other comprehensive (loss) income:
Other comprehensive (loss) income before reclassifications		(5,430	)		—			(8,601	)		(14,031	)
Amounts reclassified from accumulated other comprehensive (loss) income ⁽³⁾		—			(180	)		230			50
Effect of taxes⁽⁴⁾		612			47			2,199			2,858
Total current period other comprehensive (loss) income		(4,818	)		(133	)		(6,172	)		(11,123	)
Accumulated other comprehensive (loss) income at March 31, 2020	$	(15,813	)	$	1,501		$	(8,955	)	$	(23,267	)

(1)

Represents the unamortized 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, at the date of the sale, was recorded in other comprehensive income, net of tax, and is being reclassified to interest expense when earnings are impacted by the hedged items and as interest payments are made on the Credit Facility from January 31, 2018 to January 31, 2023 (see Note 8—Derivative Instruments and Hedging Activities).

(2)

Represents the change in fair value of interest rate hedge agreements designated as a cash flow hedge. The fair value of the interest rate hedge agreements was recorded in other comprehensive income and will be reclassified to interest expense when earnings are impacted by the hedged items and as interest payments are made on the Credit Facility from August 31, 2018 to February 28, 2025 (see Note 8—Derivative Instruments and Hedging Activities).

(3)	The Company expects to reclassify $0.7 million net gains related to the Gain on Sale of Interest Rate Hedge Agreement and $3.7 million net 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.

(4)	The Company’s effective tax rate for the three months ended March 31, 2021 and 2020 was 26.7% and 18.3%, respectively.

Stockholders' Equity

3 Months Ended

Mar. 31, 2021

Stockholders Equity Note [Abstract]

Stockholders' Equity

NOTE 11 – STOCKHOLDERS’ EQUITY

Changes in stockholders’ equity for the three months ended March 31, 2021 and 2020 are as follows:

	Three Months Ended March 31, 2021
	Common Stock					Additional Paid-in		Retained			Treasury Stock					Accumulated Other Comprehensive
	Shares			Amount		Capital		Earnings			Shares		Amount			Loss			Total
Balance at December 31, 2020		18,910		$	23	$	369,058	$	588,731			4,395	$	(196,745	)	$	(14,106	)	$	746,961
Net income		—			—		—		18,351			—		—			—			18,351
Other comprehensive income		—			—		—		—			—		—			2,780			2,780
Equity compensation		—			—		3,275		—			—		—			—			3,275
Exercise of stock options		3			—		87		—			—		—			—			87
Issuance of shares pursuant to vesting of restricted stock units		153			—		—		—			—		—			—			—
Net payments for stock issuances and buybacks		(207	)		—		—		—			207		(17,580	)		—			(17,580	)
Dividends declared		—			—		—		(2,641	)		—		—			—			(2,641	)
Balance at March 31, 2021		18,859		$	23	$	372,420	$	604,441			4,602	$	(214,325	)	$	(11,326	)	$	751,233

	Three Months Ended March 31, 2020
	Common Stock					Additional Paid-in		Retained			Treasury Stock					Accumulated Other Comprehensive
	Shares			Amount		Capital		Earnings			Shares		Amount			Loss			Total
Balance at December 31, 2019		18,868		$	23	$	346,795	$	544,840			3,978	$	(164,963	)	$	(12,144	)	$	714,551
Net income		—			—		—		10,612			—		—			—			10,612
Other comprehensive loss		—			—		—		—			—		—			(11,123	)		(11,123	)
Equity compensation		—			—		3,826		—			—		—			—			3,826
Exercise of stock options		1			—		37		—			—		—			—			37
Issuance of shares pursuant to vesting of restricted stock units		269			—		—		—			—		—			—			—
Net payments for stock issuances and buybacks		(311	)		—		—		—			311		(23,998	)		—			(23,998	)
Cumulative-effect adjustments for adoption of accounting principle		—			—		—		(513	)		—		—			—			(513	)
Dividends declared		—			—		—		(2,636	)		—		—			—			(2,636	)
Balance at March 31, 2020		18,827		$	23	$	350,658	$	552,303			4,289	$	(188,961	)	$	(23,267	)	$	690,756

Accounting for Stock-based Compensation

3 Months Ended

Mar. 31, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Accounting for Stock-based Compensation

NOTE 12 – ACCOUNTING FOR STOCK-BASED COMPENSATION

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, restricted stock units (“RSU”), performance units and performance share awards (“PSA”), cash-settled restricted stock units (“CSRSU”), and other stock-based awards to all officers, key employees, and non-employee directors of the Company. Outstanding shares granted under the Prior Plan, totaling 40,259 as of March 31, 2021, remain subject to its terms and conditions, and no additional awards from the Prior Plan are to be made after the Effective Date. As of March 31, 2021, the Company had approximately 1,002,283 shares available for grant under the 2018 Omnibus Plan. CSRSUs have no impact on the shares available for grant under the Omnibus Plan, nor on the calculated shares used in earnings per share calculations.

During the three months ended March 31, 2021, the Company granted to its employees 77,457 shares in the form of RSUs with an average grant date fair value of $88.96, and the equivalent value of 48,713 shares in the form of CSRSUs with an average grant date fair value of $88.96. During the three months ended March 31, 2021, the Company also granted 35,318 shares in the form of PSAs to its employees with a grant date fair value of $95.72 per share. The RSUs, CSRSUs and PSAs granted are generally subject to service-based vesting conditions, with the PSAs also having performance-based vesting conditions. The performance conditions for the PSAs granted in 2021 have a performance period from January 1, 2021 through December 31, 2023 and performance conditions that are consistent with the PSAs granted in prior years.

The Company recognized stock-based compensation expense of $6.1 million and $5.1 million for the three months ended March 31, 2021 and 2020, respectively. Unrecognized compensation expense of approximately $14.5 million as of March 31, 2021 related to unsettled RSUs is expected to be recognized over a weighted-average period of 2.0 years. The unrecognized compensation expense related to CSRSUs totaled approximately $11.1 million at March 31, 2021 and is expected to be recognized over a weighted-average period of 2.0 years. Unrecognized compensation expense related to PSAs of approximately $5.1 million as of March 31, 2021 is expected to be recognized over a weighted-average period of 1.7 years.

Business Combination

3 Months Ended

Mar. 31, 2021

Business Combinations [Abstract]

Business Combination

NOTE 13 – BUSINESS COMBINATION

A prior acquisition’s purchase agreement included additional consideration in the form of warranty and indemnity hold back payments. As of March 31, 2021, one payment remains outstanding for approximately $1.2 million, which is scheduled to be released in the fourth quarter of 2022. The remaining warranty and indemnity liability was recorded at its fair value at the date of the acquisition discounting the liability at 3.25%.

Earnings Per Share

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Earnings Per Share

NOTE 14 – EARNINGS PER SHARE

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 were exercised or converted into stock. The difference between the basic and diluted weighted-average equivalent shares with respect to the Company’s EPS calculation was due entirely to the assumed exercise of stock options and the vesting and settlement of RSUs and PSAs. 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 also the end of the applicable performance period and the result would be dilutive under the treasury stock method.

As of March 31, 2021, the PSAs granted during the year ended December 31, 2019 met the related performance conditions for the initial performance period and were included in the calculation of diluted EPS. However, the PSAs granted during the year ended December 31, 2020 and during the three months ended March 31, 2021 have not yet completed their initial two-year performance period and therefore were excluded in the calculation of diluted EPS. For the three months ended March 31, 2021 there were 10,327 weighted-average shares excluded from the calculation of EPS because they were anti-dilutive. The anti-dilutive shares were associated with RSUs. There were no shares excluded from the calculation of EPS for the three months ended March 31, 2020.

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

	Three Months Ended
	March 31,
	2021		2020
Net Income	$	18,351	$	10,612

Weighted-average number of basic shares outstanding during the period		18,885		18,840
Dilutive effect of stock options, RSUs, and performance shares		233		357
Weighted-average number of diluted shares outstanding during the period		19,118		19,197

Basic earnings per share	$	0.97	$	0.56
Diluted earnings per share	$	0.96	$	0.55

Share Repurchase Program

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

Share Repurchase Program

NOTE 15 – 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. The Company approved an updated Rule 10b5-1 plan element of the share repurchase program as part of its normal process, that commenced January 11, 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. For the three months ended March 31, 2021 and 2020, the Company used $12.8 million to repurchase 151,200 shares and $16.6 million to repurchase 206,820 shares, respectively, under the repurchase program. As of March 31, 2021, $33.3 million remained available for share repurchases under the repurchase program.

Fair Value

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Fair Value

NOTE 16 – FAIR VALUE

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

	March 31, 2021
(in thousands)	Level 1		Level 2		Level 3		Total		Location on Balance Sheet
Assets:
Forward contract agreements	$	—	$	74	$	—	$	74	Prepaid expenses and other assets
Deferred compensation investments in cash surrender life insurance		—		17,407		—		17,407	Other assets
Total	$	—	$	17,481	$	—	$	17,481

Liabilities:
Deferred compensation plan liabilities	$	—	$	18,264	$	—	$	18,264	Other long-term liabilities
Interest rate swaps - current portion		—		3,663		—		3,663	Accrued expenses and other current liabilities
Interest rate swaps - long-term portion		—		4,475		—		4,475	Other long-term liabilities
Total	$	—	$	26,402	$	—	$	26,402

	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 assets
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

- 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

Subsequent Events

3 Months Ended

Mar. 31, 2021

Subsequent Events [Abstract]

Subsequent Events

NOTE 17 – SUBSEQUENT EVENTS

Dividend

On May 4, 2021, the Company’s board of directors approved a $0.14 per share cash dividend. The dividend will be paid on July 14, 2021 to shareholders of record as of the close of business on June 11, 2021.

Commitments and Contingencies

3 Months Ended

Mar. 31, 2021

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

NOTE 18 – COMMITMENTS 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 its 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 (“Program”). The Program contract was a three-year, $912 million contract awarded to the Company in 2006. The Program 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 the Program’s

grant recipients, and separately supplemented the amount of recovery it sought in total to approximately $220.2 million. The State of Louisiana, through the Division of Administration, also filed suit in Louisiana state court on June 10, 2016. The State of Louisiana broadly alleges and sought 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 March 31, 2021.

Executive Chair Retirement

On November 15, 2020, the Company’s former Executive Chair gave notice of his retirement effective December 31, 2020. In connection with his retirement, the former Executive Chair is entitled to receive compensation and benefits as provided in his employment agreement for a termination of employment on the basis of “good reason.” As of March 31, 2021, the Company had $1.8 million in unpaid severance and $0.9 million in pro rata annual incentive bonus expected to be paid to the former Executive Chair by July 2021. These amounts were expensed as part of the recording of the Executive Chair’s retirement in the fourth quarter of 2020. PSA totaling 34,276, shares originally granted during 2019 and 2020, are to be satisfied through the normal course of the PSA equity award plan (see Note 12—Accounting for Stock-Based Compensation), and subject to adjustments from EPS and rTSR performances.

Basis of Presentation and Nature of Operations (Policies)	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying consolidated financial statements include the accounts of ICF International, Inc. and its subsidiaries (collectively, the “Company”), and have been prepared in accordance with United States (“U.S.”) generally accepted accounting principles (“U.S. GAAP”). 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 assets and 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 The Company has reclassified non-cash lease expense, previously part of “Other adjustments, net,” on the consolidated statements of cash flows for the three months ended March 31, 2020 for consistency of presentation.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Recent Accounting Pronouncements Not Yet Adopted Reference Rate Reform In March 2020, the Financial Accounting Standards Board issued Accounting Standards Update 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 this guidance may have on its consolidated financial statements.

Restricted Cash (Tables)

3 Months Ended

Mar. 31, 2021

Restricted Cash And Cash Equivalents Current [Abstract]

Reconciliation of Cash and Cash Equivalents, and Restricted Cash

	2021				2020
	Beginning		Ending		Beginning		Ending
Cash and cash equivalents	$	13,841	$	8,592	$	6,482	$	58,661
Restricted cash ⁽¹⁾		68,146		42,231		—		—
Total of cash, cash equivalents, and restricted cash shown in the consolidated statements of cash flows	$	81,987	$	50,823	$	6,482	$	58,661

(1)

Contract Receivables, Net (Tables)

3 Months Ended

Mar. 31, 2021

Receivables [Abstract]

Summary of Contract Receivables, Net

Contract receivables, net consisted of the following:

	March 31, 2021			December 31, 2020
Billed and billable	$	226,955		$	230,466
Allowance for expected credit losses		(12,664	)		(7,616	)
Contract receivables, net	$	214,291		$	222,850

Goodwill (Tables)

3 Months Ended

Mar. 31, 2021

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill during the three-months period ended March 31, 2021 were as follows:

Balance as of December 31, 2020	$	909,913
Effect of foreign currency translation		446
Balance as of March 31, 2021	$	910,359

Leases (Tables)

3 Months Ended

Mar. 31, 2021

Leases [Abstract]

Summary of Operating Leases

Operating leases consisted of the following at March 31, 2021:

	March 31, 2021			December 31, 2020
Real estate facilities	$	156,641		$	157,010
Office equipment		1,866			1,864
Other		604			580
		159,111			159,454
Amortization of right-of-use assets		(39,861	)		(32,322	)
Total operating lease right-of-use assets	$	119,250		$	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:

	Three Months Ended
	March 31, 2021		March 31, 2020
Operating lease costs	$	8,793	$	9,326
Short-term lease costs		131		431
Variable lease costs		10		1
Total rent expense	$	8,934	$	9,758

Summary of Future Minimum Lease Payments Under Non-Cancellable Leases

Future minimum lease payments under non-cancellable leases as of March 31, 2021 were as follows:

March 31, 2022	$	32,630
March 31, 2023		33,971
March 30, 2024		20,613
March 30, 2025		15,753
March 30, 2026		13,255
Thereafter		34,066
Total future minimum lease payments		150,288
Less: Interest		(14,856	)
Total operating lease liabilities	$	135,432

Operating lease liabilities - current	$	28,881
Operating lease liabilities - non-current		106,551
Total operating lease liabilities	$	135,432

Summary of Other Information Related to Operating Leases

Other information related to operating leases is as follows:

	March 31, 2021			March 31, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	3,957		$	9,526
Right-of-use assets obtained in exchange for operating lease liabilities	$	142		$	21,098
Weighted-average remaining lease term - operating leases		5.8			6.0
Weighted-average discount rate - operating leases		3.4	%		3.6	%

Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2021

Debt Disclosure [Abstract]

Schedule of Long-term Debt

At March 31, 2021 and December 31, 2020, debt consisted of:

	March 31, 2021				December 31, 2020
	Average Interest Rate	Outstanding Balance			Average Interest Rate	Outstanding Balance
Term Loan		$	190,000			$	192,500
Revolving Credit			136,863				123,281
Total before debt issuance costs	1.88%		326,863		2.35%		315,781
Unamortized debt issuance costs			(2,412	)			(2,567	)
		$	324,451			$	313,214

Current portion of long-term debt		$	10,000			$	10,000
Long-term debt - non-current			314,451				303,214
		$	324,451			$	313,214

Schedule of Future Scheduled Repayments of Debt Principal

Future scheduled repayments of debt principal are as follows:

Payments due by	Term Loan		Revolving Credit		Total
March 31, 2022	$	10,000	$	—	$	10,000
March 31, 2023		10,000		—		10,000
March 31, 2024		15,000		—		15,000
March 3, 2025 (Maturity)		155,000		136,863		291,863
Total	$	190,000	$	136,863	$	326,863

- 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
-SubTopic 30
-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
-SubTopic 10
-Section 50
-Paragraph 7
-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)

3 Months Ended

Mar. 31, 2021

Revenue From Contract With Customer [Abstract]

Disaggregation of Revenue

	Three Months Ended March 31,
	2021					2020
	Dollars		Percent			Dollars		Percent
Client Markets:
Energy, environment, and infrastructure	$	164,492		43	%	$	148,961		42	%
Health, education, and social programs		157,765		42	%		151,352		42	%
Safety and security		31,198		8	%		30,301		8	%
Consumer and financial services		25,023		7	%		27,624		8	%
Total	$	378,478		100	%	$	358,238		100	%

	Three Months Ended March 31,
	2021					2020
	Dollars		Percent			Dollars		Percent
Client Type:
U.S. federal government	$	175,913		46	%	$	155,604		43	%
U.S. state and local government		57,152		15	%		60,893		17	%
International government		37,061		10	%		22,801		7	%
Total Government		270,126		71	%		239,298		67	%
Commercial		108,352		29	%		118,940		33	%
Total	$	378,478		100	%	$	358,238		100	%

	Three Months Ended March 31,
	2021					2020
	Dollars		Percent			Dollars		Percent
Contract Mix:
Time-and-materials	$	160,009		42	%	$	168,070		47	%
Fixed price		147,296		39	%		133,204		37	%
Cost-based		71,173		19	%		56,964		16	%
Total	$	378,478		100	%	$	358,238		100	%

Schedule of Contract Balances and Changes in Contract Balances

Contract Balances:

	March 31, 2021			December 31, 2020			$ Change			% Change
Contract assets	$	164,155		$	143,369		$	20,786			14.5	%
Contract liabilities		(43,589	)		(42,050	)		(1,539	)		3.7	%
Net contract assets (liabilities)	$	120,566		$	101,319		$	19,247			19.0	%

Derivative instruments and Hedges Activities (Tables)

3 Months Ended

Mar. 31, 2021

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Summary of Interest Rate Swaps Derivatives Designated as Cash Flow Hedges

A summary of interest rate swap derivatives designated as cash flow hedges as of March 31, 2021 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)

Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2021

Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]

Components of Accumulated Other Comprehensive Loss

NOTE 10 – ACCUMULATED OTHER COMPREHENSIVE LOSS

Accumulated other comprehensive loss as of March 31, 2021 and 2020 included the following:

	Three Months Ended March 31, 2021
	Foreign Currency Translation Adjustments			Gain on Sale of Interest Rate Hedge Agreement ⁽¹⁾			Change in Fair Value of Interest Rate Hedge Agreements ⁽²⁾			Total
Accumulated other comprehensive (loss) income at December 31, 2020	$	(7,210	)	$	1,096		$	(7,992	)	$	(14,106	)
Current period other comprehensive (loss) income:
Other comprehensive income before reclassifications		968			—			1,882			2,850
Amounts reclassified from accumulated other comprehensive income ⁽³⁾		—			(180	)		907			727
Effect of taxes⁽⁴⁾		(104	)		49			(742	)		(797	)
Total current period other comprehensive (loss) income		864			(131	)		2,047			2,780
Accumulated other comprehensive (loss) income at March 31, 2021	$	(6,346	)	$	965		$	(5,945	)	$	(11,326	)

	Three Months Ended March 31, 2020
	Foreign Currency Translation Adjustments			Gain on Sale of Interest Rate Hedge Agreement ⁽¹⁾			Change in Fair Value of Interest Rate Hedge Agreement ⁽²⁾			Total
Accumulated other comprehensive (loss) income at December 31, 2019	$	(10,995	)	$	1,634		$	(2,783	)	$	(12,144	)
Current period other comprehensive (loss) income:
Other comprehensive (loss) income before reclassifications		(5,430	)		—			(8,601	)		(14,031	)
Amounts reclassified from accumulated other comprehensive (loss) income ⁽³⁾		—			(180	)		230			50
Effect of taxes⁽⁴⁾		612			47			2,199			2,858
Total current period other comprehensive (loss) income		(4,818	)		(133	)		(6,172	)		(11,123	)
Accumulated other comprehensive (loss) income at March 31, 2020	$	(15,813	)	$	1,501		$	(8,955	)	$	(23,267	)

(1)

(2)

(3)	The Company expects to reclassify $0.7 million net gains related to the Gain on Sale of Interest Rate Hedge Agreement and $3.7 million net 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.

(4)	The Company’s effective tax rate for the three months ended March 31, 2021 and 2020 was 26.7% and 18.3%, respectively.

Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2021

Stockholders Equity Note [Abstract]

Schedule of Changes in Stockholders' Equity

Changes in stockholders’ equity for the three months ended March 31, 2021 and 2020 are as follows:

	Three Months Ended March 31, 2021
	Common Stock					Additional Paid-in		Retained			Treasury Stock					Accumulated Other Comprehensive
	Shares			Amount		Capital		Earnings			Shares		Amount			Loss			Total
Balance at December 31, 2020		18,910		$	23	$	369,058	$	588,731			4,395	$	(196,745	)	$	(14,106	)	$	746,961
Net income		—			—		—		18,351			—		—			—			18,351
Other comprehensive income		—			—		—		—			—		—			2,780			2,780
Equity compensation		—			—		3,275		—			—		—			—			3,275
Exercise of stock options		3			—		87		—			—		—			—			87
Issuance of shares pursuant to vesting of restricted stock units		153			—		—		—			—		—			—			—
Net payments for stock issuances and buybacks		(207	)		—		—		—			207		(17,580	)		—			(17,580	)
Dividends declared		—			—		—		(2,641	)		—		—			—			(2,641	)
Balance at March 31, 2021		18,859		$	23	$	372,420	$	604,441			4,602	$	(214,325	)	$	(11,326	)	$	751,233

	Three Months Ended March 31, 2020
	Common Stock					Additional Paid-in		Retained			Treasury Stock					Accumulated Other Comprehensive
	Shares			Amount		Capital		Earnings			Shares		Amount			Loss			Total
Balance at December 31, 2019		18,868		$	23	$	346,795	$	544,840			3,978	$	(164,963	)	$	(12,144	)	$	714,551
Net income		—			—		—		10,612			—		—			—			10,612
Other comprehensive loss		—			—		—		—			—		—			(11,123	)		(11,123	)
Equity compensation		—			—		3,826		—			—		—			—			3,826
Exercise of stock options		1			—		37		—			—		—			—			37
Issuance of shares pursuant to vesting of restricted stock units		269			—		—		—			—		—			—			—
Net payments for stock issuances and buybacks		(311	)		—		—		—			311		(23,998	)		—			(23,998	)
Cumulative-effect adjustments for adoption of accounting principle		—			—		—		(513	)		—		—			—			(513	)
Dividends declared		—			—		—		(2,636	)		—		—			—			(2,636	)
Balance at March 31, 2020		18,827		$	23	$	350,658	$	552,303			4,289	$	(188,961	)	$	(23,267	)	$	690,756

Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Schedule of Dilutive Effect of Stock Options RSUs and PSAs

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

	Three Months Ended
	March 31,
	2021		2020
Net Income	$	18,351	$	10,612

Weighted-average number of basic shares outstanding during the period		18,885		18,840
Dilutive effect of stock options, RSUs, and performance shares		233		357
Weighted-average number of diluted shares outstanding during the period		19,118		19,197

Basic earnings per share	$	0.97	$	0.56
Diluted earnings per share	$	0.96	$	0.55

Fair Value (Tables)

3 Months Ended

Mar. 31, 2021

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 balance sheets are as follows:

	March 31, 2021
(in thousands)	Level 1		Level 2		Level 3		Total		Location on Balance Sheet
Assets:
Forward contract agreements	$	—	$	74	$	—	$	74	Prepaid expenses and other assets
Deferred compensation investments in cash surrender life insurance		—		17,407		—		17,407	Other assets
Total	$	—	$	17,481	$	—	$	17,481

Liabilities:
Deferred compensation plan liabilities	$	—	$	18,264	$	—	$	18,264	Other long-term liabilities
Interest rate swaps - current portion		—		3,663		—		3,663	Accrued expenses and other current liabilities
Interest rate swaps - long-term portion		—		4,475		—		4,475	Other long-term liabilities
Total	$	—	$	26,402	$	—	$	26,402

	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 assets
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

- 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

Basis of Presentation and Nature of Operations - Additional Information (Details)	3 Months Ended
	Mar. 31, 2021 Office Segment
Basis of Presentation and Nature of Operations [Line Items]
Number of operating segments \| Segment	1
Number of reporting segments \| Segment	1
Domestic \| Minimum
Basis of Presentation and Nature of Operations [Line Items]
Number of offices \| Office	56
International
Basis of Presentation and Nature of Operations [Line Items]
Number of offices \| Office	22

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

Mar. 31, 2021

Dec. 31, 2020

Mar. 31, 2020

Dec. 31, 2019

Cash And Cash Equivalents [Abstract]

Cash and cash equivalents

$ 8,592

$ 13,841

$ 58,661

$ 6,482

Restricted cash

^[1]

42,231

68,146

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

$ 50,823

$ 81,987

$ 58,661

$ 6,482

[1]

Contract Receivables, Net - Summary of Contract Receivables, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Receivables [Abstract]
Billed and billable	$ 226,955	$ 230,466
Allowance for expected credit losses	(12,664)	(7,616)
Contract receivables, net	$ 214,291	$ 222,850

Goodwill - Schedule of Changes in Carrying Amount of Goodwill (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
Balance as of December 31, 2020	$ 909,913
Effect of foreign currency translation	446
Balance as of March 31, 2021	$ 910,359

Leases - Additional Information (Details) $ in Millions	3 Months Ended
Leases - Additional Information (Details) $ in Millions	Mar. 31, 2021 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	$ 115.3
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	Mar. 31, 2021	Dec. 31, 2020
Lessee Lease Description [Line Items]
Operating lease right of use assets, gross	$ 159,111	$ 159,454
Amortization of right-of-use assets	(39,861)	(32,322)
Total operating lease right-of-use assets	119,250	127,132
Real Estate Facilities
Lessee Lease Description [Line Items]
Operating lease right of use assets, gross	156,641	157,010
Office Equipment
Lessee Lease Description [Line Items]
Operating lease right of use assets, gross	1,866	1,864
Other
Lessee Lease Description [Line Items]
Operating lease right of use assets, gross	$ 604	$ 580

Leases - Summary of Rent Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Operating lease costs	$ 8,793	$ 9,326
Short-term lease costs	131	431
Variable lease costs	10	1
Total rent expense	$ 8,934	$ 9,758

Leases - Summary of Future Minimum Lease Payments Under Non-Cancellable Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Leases [Abstract]
March 31, 2022	$ 32,630
March 31, 2023	33,971
March 30, 2024	20,613
March 30, 2025	15,753
March 30, 2026	13,255
Thereafter	34,066
Total future minimum lease payments	150,288
Less: Interest	(14,856)
Total operating lease liabilities	135,432
Operating lease liabilities - current	28,881	$ 23,350
Operating lease liabilities - non-current	106,551	$ 115,614
Total operating lease liabilities	$ 135,432

Leases - Summary of Other Information Related to Operating Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Operating cash flows from operating leases	$ 3,957	$ 9,526
Right-of-use assets obtained in exchange for operating lease liabilities	$ 142	$ 21,098
Weighted-average remaining lease term - operating leases	5 years 9 months 18 days	6 years
Weighted-average discount rate - operating leases	3.40%	3.60%

Long-Term Debt - Schedule of Long Term Debt (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Average Interest Rate	1.88%	2.35%
Outstanding Balance before debt issuance costs	$ 326,863	$ 315,781
Unamortized debt issuance costs	(2,412)	(2,567)
Long-term Debt	324,451	313,214
Current portion of long-term debt	10,000	10,000
Long-term debt	314,451	303,214
Term Loan
Debt Instrument [Line Items]
Outstanding Balance before debt issuance costs	190,000	192,500
Revolving Credit
Debt Instrument [Line Items]
Outstanding Balance before debt issuance costs	$ 136,863	$ 123,281

Long-Term Debt - Additional Information (Details)		3 Months Ended
Long-Term Debt - Additional Information (Details)	Mar. 03, 2020 USD ($) Bank	Mar. 31, 2021 USD ($)	Dec. 31, 2020 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, interest coverage ratio covenant	300.00%
Line of credit facility, leverage ratio covenant	400.00%
Line of credit facility, leverage ratio covenant step-up pursuant to permitted acquisitions	425.00%
Long-term debt outstanding exclusive of unamortized debt issuance costs		$ 326,863,000	$ 315,781,000
Letters of credit outstanding, amount		3,300,000
Derivative obligation, net		6,700,000
Line of credit facility, remaining borrowing capacity		459,900,000
Line of credit facility, current borrowing capacity		$ 265,500,000
Federal Funds Open Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.50%
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 Future Scheduled Repayments of Term Loan Principal (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
March 31, 2022	$ 10,000
March 31, 2023	10,000
March 31, 2024	15,000
March 3, 2025 (Maturity)	291,863
Total	326,863	$ 315,781
Term Loan
Debt Instrument [Line Items]
March 31, 2022	10,000
March 31, 2023	10,000
March 31, 2024	15,000
March 3, 2025 (Maturity)	155,000
Total	190,000	192,500
Revolving Credit
Debt Instrument [Line Items]
March 3, 2025 (Maturity)	136,863
Total	$ 136,863	$ 123,281

Revenue Recognition - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation Of Revenue [Line Items]
Revenue from clients	$ 378,478	$ 358,238
Time-and-Materials
Disaggregation Of Revenue [Line Items]
Revenue from clients	160,009	168,070
Fixed-Price
Disaggregation Of Revenue [Line Items]
Revenue from clients	147,296	133,204
Cost-Based
Disaggregation Of Revenue [Line Items]
Revenue from clients	71,173	56,964
U.S. Federal Government
Disaggregation Of Revenue [Line Items]
Revenue from clients	175,913	155,604
U.S. State and Local Government
Disaggregation Of Revenue [Line Items]
Revenue from clients	57,152	60,893
International Government
Disaggregation Of Revenue [Line Items]
Revenue from clients	37,061	22,801
Total Government
Disaggregation Of Revenue [Line Items]
Revenue from clients	270,126	239,298
Commercial
Disaggregation Of Revenue [Line Items]
Revenue from clients	$ 108,352	$ 118,940
Customer Concentration Risk \| Revenue from Contract with Customer
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	100.00%	100.00%
Customer Concentration Risk \| Revenue from Contract with Customer \| Time-and-Materials
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	42.00%	47.00%
Customer Concentration Risk \| Revenue from Contract with Customer \| Fixed-Price
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	39.00%	37.00%
Customer Concentration Risk \| Revenue from Contract with Customer \| Cost-Based
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	19.00%	16.00%
Customer Concentration Risk \| Revenue from Contract with Customer \| U.S. Federal Government
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	46.00%	43.00%
Customer Concentration Risk \| Revenue from Contract with Customer \| U.S. State and Local Government
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	15.00%	17.00%
Customer Concentration Risk \| Revenue from Contract with Customer \| International Government
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	10.00%	7.00%
Customer Concentration Risk \| Revenue from Contract with Customer \| Total Government
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	71.00%	67.00%
Customer Concentration Risk \| Revenue from Contract with Customer \| Commercial
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	29.00%	33.00%
Energy, Environmental and Infrastructure
Disaggregation Of Revenue [Line Items]
Revenue from clients	$ 164,492	$ 148,961
Energy, Environmental and Infrastructure \| Customer Concentration Risk \| Revenue from Contract with Customer
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	43.00%	42.00%
Health, Education and Social Programs
Disaggregation Of Revenue [Line Items]
Revenue from clients	$ 157,765	$ 151,352
Health, Education and Social Programs \| Customer Concentration Risk \| Revenue from Contract with Customer
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	42.00%	42.00%
Safety and Security
Disaggregation Of Revenue [Line Items]
Revenue from clients	$ 31,198	$ 30,301
Safety and Security \| Customer Concentration Risk \| Revenue from Contract with Customer
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	8.00%	8.00%
Consumer and Financial Services
Disaggregation Of Revenue [Line Items]
Revenue from clients	$ 25,023	$ 27,624
Consumer and Financial Services \| Customer Concentration Risk \| Revenue from Contract with Customer
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	7.00%	8.00%

Revenue Recognition - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue From Contract With Customer [Abstract]
Net contract assets (liabilities)	$ 19,247
Revenue related to contract liabilities	$ 15,100	$ 17,300

Revenue Recognition - Schedule of Changes in Contract Balances Due to Adoption of New Accounting Standards (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Revenue From Contract With Customer [Abstract]
Contract assets	$ 164,155	$ 143,369
Contract liabilities	(43,589)	(42,050)
Net contract assets (liabilities)	120,566	$ 101,319
Change in contract assets	20,786
Change in contract liabilities	(1,539)
Change in net contract assets (liabilities)	$ 19,247
Percentage of change in contract assets	14.50%
Percentage of change in contract liabilities	3.70%
Percentage of change in net contract assets (liabilities)	19.00%

Revenue Recognition - Additional Information (Detail1) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-04-01 $ in Billions	Mar. 31, 2021 USD ($)
Revenue From Contract With Customer [Line Items]
Unfulfilled performance obligation	$ 1.6
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 - 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]

Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Taxes [Line Items]
Effective income tax rate reconciliation, percent	26.70%	18.30%
Unrecognized tax benefits	$ 700,000
Unrecognized tax benefits that would impact effective tax rate	700,000	$ 0
Unrecognized tax benefits, income tax penalties and interest accrued	$ 0	$ 0
COVID-19 Pandemic \| CARES Act \| U.S. Federal Government
Income Taxes [Line Items]
Exercised option to defer employer portion of social security tax payment description	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.
Percentage of deferred employer portion of social security tax repayable	50.00%
Employer portion of social security tax repayable date	Dec. 31, 2021
Employer portion of social security tax repayable remainder date	Dec. 31, 2022
Employer portion of social security tax deferred	$ 20,900,000
Internal Revenue Service (IRS) \| Latest Tax Year
Income Taxes [Line Items]
Open tax year	2019
Internal Revenue Service (IRS) \| Earliest Tax Year
Income Taxes [Line Items]
Open tax year	2017
State Local and Foreign Jurisdictions \| Latest Tax Year
Income Taxes [Line Items]
Open tax year	2019
State Local and Foreign Jurisdictions \| Earliest Tax Year
Income Taxes [Line Items]
Open tax year	2016

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

3 Months Ended

Mar. 31, 2021

Mar. 31, 2020

Accumulated Other Comprehensive Income Loss [Line Items]

Balance

$ 746,961

$ 714,551

Current period other comprehensive (loss) income:

Total current period other comprehensive (loss) income

2,780

(11,123)

Balance

751,233

690,756

Foreign Currency Translation Adjustments

Accumulated Other Comprehensive Income Loss [Line Items]

Balance

(7,210)

(10,995)

Current period other comprehensive (loss) income:

Other comprehensive (loss) income before reclassifications

968

(5,430)

Effect of taxes

^[1]

(104)

612

Total current period other comprehensive (loss) income

864

(4,818)

Balance

(6,346)

(15,813)

Gain on Sale of Interest Rate Hedge Agreement

Accumulated Other Comprehensive Income Loss [Line Items]

Balance

^[2]

1,096

1,634

Current period other comprehensive (loss) income:

Amounts reclassified from accumulated other comprehensive (loss) income

^[2],[3]

(180)

Effect of taxes

^[1],[2]

Total current period other comprehensive (loss) income

^[2]

(131)

(133)

Balance

^[2]

965

1,501

Change in Fair Value of Interest Rate Hedge Agreements

Accumulated Other Comprehensive Income Loss [Line Items]

Balance

^[4]

(7,992)

(2,783)

Current period other comprehensive (loss) income:

Other comprehensive (loss) income before reclassifications

^[4]

1,882

(8,601)

Amounts reclassified from accumulated other comprehensive (loss) income

^[3],[4]

907

230

Effect of taxes

^[1],[4]

(742)

2,199

Total current period other comprehensive (loss) income

^[4]

2,047

(6,172)

Balance

^[4]

(5,945)

(8,955)

Accumulated Other Comprehensive Loss

Accumulated Other Comprehensive Income Loss [Line Items]

Balance

(14,106)

(12,144)

Current period other comprehensive (loss) income:

Other comprehensive (loss) income before reclassifications

2,850

(14,031)

Amounts reclassified from accumulated other comprehensive (loss) income

^[3]

727

Effect of taxes

^[1]

(797)

2,858

Total current period other comprehensive (loss) income

2,780

(11,123)

Balance

$ (11,326)

$ (23,267)

[1]	The Company’s effective tax rate for the three months ended March 31, 2021 and 2020 was 26.7% and 18.3%, respectively
[2]	Represents the unamortized 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, at the date of the sale, was recorded in other comprehensive income, net of tax, and is being reclassified to interest expense when earnings are impacted by the hedged items and as interest payments are made on the Credit Facility from January 31, 2018 to January 31, 2023 (see Note 8—Derivative Instruments and Hedging Activities).
[3]	The Company expects to reclassify $0.7 million net gains related to the Gain on Sale of Interest Rate Hedge Agreement and $3.7 million net 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
[4]	Represents the change in fair value of interest rate hedge agreements designated as a cash flow hedge. The fair value of the interest rate hedge agreements was recorded in other comprehensive income and will be reclassified to interest expense when earnings are impacted by the hedged items and as interest payments are made on the Credit Facility from August 31, 2018 to February 28, 2025 (see Note 8—Derivative Instruments and Hedging Activities).

Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]
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
Effective tax rate	26.70%	18.30%

Stockholders' Equity - Schedule of Changes in Stockholders' Equity (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Balance	$ 746,961	$ 714,551
Net income	18,351	10,612
Other comprehensive income (loss)	2,780	(11,123)
Equity compensation	3,275	3,826
Exercise of stock options	87	37
Net payments for stock issuances and buybacks	(17,580)	(23,998)
Dividends declared	(2,641)	(2,636)
Balance	$ 751,233	690,756
Cumulative-Effect Adjustments for Adoption of Accounting Principle \| Revision of Prior Period, Adjustment
Balance		$ (513)
Accounting Standards Update Extensible List		us-gaap:AccountingStandardsUpdate201613Member
Common Stock
Balance (in shares)	18,910	18,868
Balance	$ 23	$ 23
Exercise of stock options (in shares)	3	1
Issuance of shares pursuant to vesting of restricted stock units (in shares)	153	269
Net payments for stock issuances and buybacks (in shares)	(207)	(311)
Balance (in shares)	18,859	18,827
Balance	$ 23	$ 23
Additional Paid-in Capital
Balance	369,058	346,795
Equity compensation	3,275	3,826
Exercise of stock options	87	37
Balance	372,420	350,658
Retained Earnings
Balance	588,731	544,840
Net income	18,351	10,612
Dividends declared	(2,641)	(2,636)
Balance	$ 604,441	552,303
Retained Earnings \| Cumulative-Effect Adjustments for Adoption of Accounting Principle \| Revision of Prior Period, Adjustment
Balance		$ (513)
Accounting Standards Update Extensible List		us-gaap:AccountingStandardsUpdate201613Member
Treasury Stock
Balance (in shares)	4,395	3,978
Balance	$ (196,745)	$ (164,963)
Net payments for stock issuances and buybacks (in shares)	207	311
Net payments for stock issuances and buybacks	$ (17,580)	$ (23,998)
Balance (in shares)	4,602	4,289
Balance	$ (214,325)	$ (188,961)
Accumulated Other Comprehensive Loss
Balance	(14,106)	(12,144)
Other comprehensive income (loss)	2,780	(11,123)
Balance	$ (11,326)	$ (23,267)

Accounting for Stock-based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Apr. 04, 2018	Mar. 31, 2021	Mar. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Allocated share-based compensation expense		$ 6.1	$ 5.1
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period		77,457
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value		$ 88.96
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized		$ 14.5
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition		2 years
Cash Settled RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period		48,713
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value		$ 88.96
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized		$ 11.1
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition		2 years
Performance Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period		35,318
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value		$ 95.72
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized		$ 5.1
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition		1 year 8 months 12 days
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	40,259
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		1,002,283

Business Combinations - Additional Information (Details) - ITG - Indemnity $ in Millions		3 Months Ended
	Jan. 31, 2020	Dec. 31, 2022 USD ($)	Mar. 31, 2021 Payment
Business Acquisition [Line Items]
Business combination, number of payment outstanding \| Payment			1
Percentage of fair value acquisition discounting liabilities	3.25%
Forecast
Business Acquisition [Line Items]
Purchase price acquisition \| $		$ 1.2

Earnings Per Share - Additional Information (Details) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Antidilutive securities excluded from computation of earnings per share, amount	10,327	0
Performance Shares \| Initial Performance Vesting Period
Share-based compensation arrangement by share-based payment award, award vesting period	2 years

Earnings Per Share - Schedule of Dilutive Effect of Stock Options RSUs and PSAs (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net Income	$ 18,351	$ 10,612
Weighted-average number of basic shares outstanding during the period	18,885	18,840
Dilutive effect of stock options, RSUs, and performance shares	233	357
Weighted-average number of diluted shares outstanding during the period	19,118	19,197
Basic earnings per share	$ 0.97	$ 0.56
Diluted earnings per share	$ 0.96	$ 0.55

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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+ Details

Share Repurchase Program - Additional Information (Details)	3 Months Ended
	Mar. 31, 2021 USD ($) shares	Mar. 31, 2020 USD ($) shares
Equity Class Of Treasury Stock [Line Items]
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, Value	$ 12,800,000	$ 16,600,000
Stock Repurchased During Period, Shares \| shares	151,200	206,820
Credit Facility
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, remaining authorized repurchase amount	$ 33,300,000

Fair Value - Schedule of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - Fair Value, Recurring - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets:
Assets, Total	$ 17,481	$ 16,899
Liabilities:
Liabilities, Total	26,402	28,203
Forward Contract Agreements \| Prepaid Expenses and Other
Assets:
Assets, Total	74	103
Deferred Compensation Investments in Cash Surrender Life Insurance \| Other Assets
Assets:
Assets, Total	17,407	16,796
Deferred Compensation Plan Liabilities \| Other Long-Term Liabilities
Liabilities:
Liabilities, Total	18,264	17,276
Interest Rate Swap \| Other Long-Term Liabilities
Liabilities:
Liabilities, Total	4,475	7,234
Interest Rate Swap \| Accrued Expenses and Other Current Liabilities
Liabilities:
Liabilities, Total	3,663	3,693
Level 2
Assets:
Assets, Total	17,481	16,899
Liabilities:
Liabilities, Total	26,402	28,203
Level 2 \| Forward Contract Agreements \| Prepaid Expenses and Other
Assets:
Assets, Total	74	103
Level 2 \| Deferred Compensation Investments in Cash Surrender Life Insurance \| Other Assets
Assets:
Assets, Total	17,407	16,796
Level 2 \| Deferred Compensation Plan Liabilities \| Other Long-Term Liabilities
Liabilities:
Liabilities, Total	18,264	17,276
Level 2 \| Interest Rate Swap \| Other Long-Term Liabilities
Liabilities:
Liabilities, Total	4,475	7,234
Level 2 \| Interest Rate Swap \| Accrued Expenses and Other Current Liabilities
Liabilities:
Liabilities, Total	$ 3,663	$ 3,693

Subsequent Events - Additional Information (Details) - Subsequent Event	May 04, 2021 $ / shares
Subsequent Event [Line Items]
Dividend declaration date	May 04, 2021
Cash dividend per share	$ 0.14
Dividend payment date	Jul. 14, 2021
Dividend record date	Jun. 11, 2021

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions		1 Months Ended	12 Months Ended
	Jun. 10, 2016	Jul. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2020
Loss Contingencies [Line Items]
Community development related to claim					$ 220.2
Executive Chair \| Performance Shares
Loss Contingencies [Line Items]
Shares granted vested and accelerated			34,276	34,276
Executive Chair \| Forecast
Loss Contingencies [Line Items]
Severance costs		$ 1.8
Compensation arrangement annual incentive bonus		$ 0.9
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