View Filing Data

Print Document View Excel Document

Document And Entity Information - shares	3 Months Ended
Document And Entity Information - shares	Mar. 31, 2019	Apr. 26, 2019
Document And Entity Information [Abstract]
Entity Registrant Name	ICF International, Inc.
Entity Central Index Key	0001362004
Trading Symbol	ICFI
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 (in shares)		18,830,058
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Amendment Flag	false

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 5,689	$ 11,694
Contract receivables, net	222,472	230,966
Contract assets	151,805	126,688
Prepaid expenses and other assets	15,548	16,253
Income tax receivable	4,222	6,505
Total Current Assets	399,736	392,106
Property and Equipment, net	50,888	48,105
Other Assets:
Restricted cash - non-current		1,292
Goodwill	720,360	715,644
Other intangible assets, net	33,520	35,494
Operating lease - right-of-use assets	127,587
Other assets	22,530	21,221
Total Assets	1,354,621	1,213,862
Current Liabilities:
Accounts payable	87,039	102,599
Contract liabilities	35,936	33,494
Operating lease liabilities - current	30,324
Accrued salaries and benefits	50,014	44,103
Accrued subcontractors and other direct costs	49,955	58,791
Accrued expenses and other current liabilities	27,902	39,072
Total Current Liabilities	281,170	278,059
Long-term Liabilities:
Long-term debt	232,318	200,424
Operating lease liabilities - non-current	112,676
Deferred rent		13,938
Deferred income taxes	43,344	40,165
Other	22,542	20,859
Total Liabilities	692,050	553,445
Commitments and Contingencies (Note 15)
Stockholders’ Equity:
Preferred stock, par value $.001; 5,000,000 shares authorized; none issued
Common stock, par value $.001; 70,000,000 shares authorized; 22,660,508 and 22,445,576 shares issued as of March 31, 2019 and December 31, 2018, respectively; 18,865,729 and 18,817,495 shares outstanding as of March 31, 2019 and December 31, 2018, respectively	23	22
Additional paid-in capital	330,763	326,208
Retained earnings	499,126	486,442
Treasury stock	(155,073)	(139,704)
Accumulated other comprehensive loss	(12,268)	(12,551)
Total Stockholders’ Equity	662,571	660,417
Total Liabilities and Stockholders’ Equity	$ 1,354,621	$ 1,213,862

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2019	Dec. 31, 2018
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)	22,660,508	22,445,576
Common stock, outstanding (in shares)	18,865,729	18,817,495

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenue	$ 341,254	$ 302,780
Direct costs	215,949	188,826
Operating costs and expenses:
Indirect and selling expenses	96,519	89,659
Depreciation and amortization	4,762	4,469
Amortization of intangible assets	2,135	2,244
Total operating costs and expenses	103,416	96,372
Operating income	21,889	17,582
Interest expense	(2,453)	(1,666)
Other (expense) income	(412)	104
Income before income taxes	19,024	16,020
Provision for income taxes	3,706	3,603
Net income	$ 15,318	$ 12,417
Earnings per Share:
Basic	$ 0.81	$ 0.67
Diluted	$ 0.80	$ 0.65
Weighted-average Shares:
Basic	18,825	18,670
Diluted	19,263	19,158
Cash dividends declared per common share	$ 0.14	$ 0.14
Other comprehensive income, net of tax	$ 283	$ 1,609
Comprehensive income, net of tax	$ 15,601	$ 14,026

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flows from Operating Activities
Net income	$ 15,318	$ 12,417
Adjustments to reconcile net income to net cash used in operating activities:
Bad debt expense	(159)	628
Deferred income taxes	3,144	2,640
Non-cash equity compensation	4,151	2,391
Depreciation and amortization	6,897	6,712
Facilities consolidation reserve	(67)	(64)
Amortization of debt issuance costs	127	130
Other adjustments, net	(264)	(535)
Changes in operating assets and liabilities:
Net contract assets and liabilities	(23,152)	(11,413)
Contract receivables	8,236	3,319
Prepaid expenses and other assets	1,353	(5,107)
Accounts payable	(15,561)	(6,942)
Accrued salaries and benefits	5,913	834
Accrued subcontractors and other direct costs	(8,796)	(13,540)
Accrued expenses and other current liabilities	(8,705)	4,457
Income tax receivable and payable	(757)	(2,120)
Other liabilities	(366)	346
Net Cash Used in Operating Activities	(12,688)	(5,847)
Cash Flows from Investing Activities
Capital expenditures for property and equipment and capitalized software	(7,539)	(3,236)
Payments for business acquisitions, net of cash received	(1,819)	(11,835)
Net Cash Used in Investing Activities	(9,358)	(15,071)
Cash Flows from Financing Activities
Advances from working capital facilities	163,240	138,240
Payments on working capital facilities	(131,346)	(112,999)
Payments on capital expenditure obligations		(814)
Debt issue costs		(21)
Proceeds from exercise of options	404	1,800
Dividends paid	(2,636)
Net payments for stockholder issuances and buybacks	(15,218)	(9,109)
Net Cash Provided by Financing Activities	14,444	17,097
Effect of Exchange Rate Changes on Cash, Cash Equivalents, and Restricted Cash	305	120
Decrease in Cash, Cash Equivalents, and Restricted Cash	(7,297)	(3,701)
Cash, Cash Equivalents, and Restricted Cash, Beginning of Period	12,986	24,266
Cash, Cash Equivalents, and Restricted Cash, End of Period	5,689	20,565
Supplemental Disclosure of Cash Flow Information
Interest	1,597	1,596
Income taxes	$ 1,066	$ 615

Basis of Presentation and Nature of Operations

3 Months Ended

Mar. 31, 2019

Accounting Policies [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, analysis, assessment and advice to design and implementation of programs and technology-based solutions, as well as 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, oil 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 and local governments and U.S. territorial governments, unless otherwise indicated.

The Company, incorporated in Delaware, is headquartered in Fairfax, Virginia. It maintains offices throughout the world, including 65 or more offices in the U.S. and U.S. territories and 15 or more offices in key regions outside the U.S., including offices in the United Kingdom, Belgium, China, India, and Canada.

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 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, 2019 and 2018 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, 2018 and the notes thereto included in the Company’s Annual Report on Form 10-K, filed with the SEC on February 27, 2019 (the “Annual Report”).

Reclassifications

Certain amounts in the 2018 consolidated financial statements have been reclassified to conform to the current year presentation. The reclassifications were immaterial.

Significant Accounting Policies

Leases

The Company determines if an arrangement is a lease at inception. Operating leases are included in operating lease right-of-use (“ROU”) assets, other liabilities (current and non-current) on the consolidated balance sheets.

Operating lease ROU assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments as of the commencement date. Since most lease agreements do not provide an implicit rate, the Company uses its incremental borrowing rate as of the commencement date in estimating the present value of future payments. The operating lease ROU asset is based on the present value of future lease payments and excludes impacts from lease incentives and initial costs incurred to obtain the lease. Lease terms, for the purposes of determining each lease’s present value, include options to extend or terminate the lease if it is reasonably certain and economically reasonable that the Company will exercise that option. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term.

The Company uses leases to obtain use of a variety of different resources, including those for the use of facilities or equipment. These agreements may contain both lease and non-lease components which are generally accounted for separately. For equipment leases (including copier leases), the Company accounts for the lease component as well as insignificant non-lease components as a single lease.

Recent Accounting Pronouncements

Recent Accounting Pronouncements Adopted

Leases

In February 2016, the Financial Accounting Standards Board (“FASB”) issued a new standard related to leases, Accounting Standard Update (“ASU”) 2016-02, Leases (Topic 842), to increase transparency and comparability among organizations by requiring the recognition of ROU assets and lease liabilities on the balance sheet for those leases classified as operating leases. Under the new standard, required disclosures enable users of financial statements to assess the amount, timing and uncertainty of cash flows arising from leases. The Company, using a modified retrospective adoption approach, is also required to recognize and measure leases existing at the beginning of the period of adoption, with certain practical expedients available.

The Company adopted the standard effective January 1, 2019. The Company choose the following practical expedients: not to re-assess existing and expired contracts to determine if they contain embedded leases; not to re-assess lease classification on existing leases; not to re-assess initial direct costs of obtaining leases; to account for lease and non-lease components as a single lease component for equipment leases; and to only apply the standard to leases with a term of twelve months or greater.

The most significant impact of adopting the standard was the recognition of ROU assets and lease liabilities for operating leases on the Company’s consolidated balance sheet but it did not have an impact on the Company’s consolidated statements of comprehensive income or consolidated statements of cash flow. The impact to the consolidated balance sheets before and after the adoption are as follows:

	January 1, 2019
	Before Adoption		Adoption Adjustments			After Adoption
Operating lease - right-of-use assets	$	—	$	137,152		$	137,152
Operating lease liabilities - current		—		30,951			30,951
Accrued expenses and other current liabilities		1,843		(1,843	)		—
Operating lease liabilities - non-current		—		121,982			121,982
Deferred rent		13,938		(13,938	)		—

Stock Compensation

In June 2018, the FASB issued ASU 2018-07, Compensation—Stock Compensation (Topic 718). The standard simplifies the accounting for share-based compensation to non-employees by aligning the guidance with share-based payments to employees. It is effective for interim and annual reporting periods beginning after December 15, 2018. The Company’s adoption of ASU 2018-07 did not have a material impact on the consolidated financial statements.

Recent Accounting Pronouncements Not Yet Adopted

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

In August 2018, the FASB issued ASU 2018-15, Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40). The standard aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is considered a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The standard also requires the entity to expense the capitalized implementation costs of a hosting arrangement over the term of the hosting arrangement and present the expense related to the capitalized implementation costs in the same line item in the statement of income as the fees associated with the hosting arrangement. The standard is effective for interim periods and fiscal years beginning after December 15, 2019 with early adoption permitted. The standard may be implemented using either the retrospective or prospective method. The Company is currently in the process of evaluating the impact of adoption and mode of adoption but does not anticipate that there will be a material impact on the consolidated financial statements as a result of adopting the standard.

Contract Receivables, Net

3 Months Ended

Mar. 31, 2019

Receivables [Abstract]

Contract Receivables, Net

NOTE 2 – CONTRACT RECEIVABLES, NET

Contract receivables, net consisted of the following:

	March 31, 2019			December 31, 2018
Billed and billable	$	227,583		$	236,250
Allowance for doubtful accounts		(5,111	)		(5,284	)
Contract receivables, net	$	222,472		$	230,966

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

Goodwill

3 Months Ended

Mar. 31, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill

NOTE 3 – GOODWILL

The changes in the carrying amount of goodwill during the three-months period ended March 31, 2019 were as follows:

Balance as of December 31, 2018	$	715,644
Goodwill resulting from business combination - Olson⁽¹⁾		3,047
Goodwill resulting from business combination - We Are Vista ⁽²⁾		579
Effect of foreign currency translation		1,090
Balance as of March 31, 2019	$	720,360

⁽¹⁾

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

⁽²⁾

Goodwill measurement period adjustment related to the settlement of the working capital adjustment under the purchase agreement.

Long-Term Debt

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Long-Term Debt

NOTE 4 – LONG-TERM DEBT

On May 17, 2017, the Company entered into a Fifth Amended and Restated Business Loan and Security Agreement with a syndication of 11 commercial banks (the “Credit Facility”). The Credit Facility: (i) included modifications to the Company’s Fourth Amended and Restated Business Loan and Security Agreement, (ii) matures on May 17, 2022, (iii) increased the borrowing ceiling up to $600.0 million without a borrowing base requirement, taking into account financial, performance-based limitations, and (iv) provided for an “accordion,” which permits additional revolving credit commitments of up to $300.0 million, subject to lenders’ approval.

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 Federal Funds Open Rate, plus 0.5%, (ii) the Prime Rate, 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 of the assets of the Company and requires that the Company remain in compliance with certain financial and non-financial covenants. The financial covenants require, among other things, that the Company maintain at all times an Interest Coverage Ratio (as defined under the Credit Facility) of not less than 3.00 to 1.00 and a Leverage Ratio of not more than 3.75 to 1.00 (subject to adjustment, in certain circumstances) for each fiscal quarter. As of March 31, 2019, the Company was in compliance with its covenants under the Credit Facility.

As of March 31, 2019, the Company had $232.3 million long-term debt outstanding, ten outstanding letters of credit totaling $3.1 million, and unused borrowing capacity of $364.6 million under the Credit Facility (excluding the accordion). Taking into account the financial, performance-based limitations, available borrowing capacity (excluding the accordion) was $273.9 million as of March 31, 2019. The weighted-average interest rate on debt outstanding was 3.76% and 2.84% for the first three months of 2019 and 2018, respectively.

Leases

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Leases

NOTE 5 – LEASES

The Company has operating leases for facilities and equipment which have remaining terms ranging from 1 to 29 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. Certain 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, 2019:

Real estate facilities	$	132,596
Office equipment		2,062
Other		486
		135,144
Amortization of right-of-use assets		(7,557	)
Total operating lease right-of-use assets	$	127,587

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

	Three Months Ended
	March 31, 2019
Operating lease costs	$	8,896
Short-term lease costs		681
Variable lease costs		12
Total operating lease costs		9,589
Sublease income		—
Total rent expense	$	9,589

Future minimum lease payments under non-cancellable leases as of March 31, 2019 were as follows:

March 31, 2020	$	34,825
March 31, 2021		32,970
March 31, 2022		31,653
March 31, 2023		25,967
March 31, 2024		13,065
Thereafter		18,694
Total future minimum lease payments		157,174
Less: Interest		(14,174	)
Total operating lease liabilities	$	143,000

Operating lease liabilities - current	$	30,324
Operating lease liabilities - non-current		112,676
Total operating lease liabilities	$	143,000

Other information related to operating leases is as follows:

	Three Months Ended
	March 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	9,389
Right-of-use assets obtained in exchange for new operating lease liabilities	$	2,159
Weighted-average remaining lease term - operating leases		5.1
Weighted-average discount rate - operating leases		3.8	%

At March 31, 2019, the Company had additional operating leases that have not yet commenced of $16.6 million. Such operating leases will commence within the next year and with lease terms of 1 year to 28 years.

Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss

3 Months Ended

Mar. 31, 2019

Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]

Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss

NOTE 6 – OTHER COMPREHENSIVE INCOME (LOSS) AND ACCUMULATED OTHER COMPREHENSIVE LOSS

Other comprehensive income (loss) includes foreign currency translation adjustments arising from the conversion of financial statements of foreign subsidiaries into U.S. dollars, the amortization of the gain on the sale of an interest rate hedge agreement, and the change in the fair value of current interest rate hedge agreements. Components of accumulated other comprehensive loss as of March 31, 2019 and 2018 are as follows:

	Three Months Ended March 31, 2019
	Foreign Currency Translation Adjustments			Gain on Sale of Interest Rate Hedge Agreement ⁽¹⁾			Change in Fair Value of Interest Rate Hedge Agreements ⁽²⁾⁽⁵⁾			Total
Accumulated other comprehensive (loss) income at January 1, 2019	$	(14,168	)	$	2,164		$	(547	)	$	(12,551	)
Current period other comprehensive (loss) income:
Other comprehensive income (loss) before reclassifications		1,254			—			(1,164	)		90
Amounts reclassified from accumulated other comprehensive income		—			(180	)		23			(157	)
Effect of taxes⁽³⁾		—			47			303			350
Total current period other comprehensive (loss) income		1,254			(133	)		(838	)		283
Accumulated other comprehensive (loss) income at March 31, 2019	$	(12,914	)	$	2,031		$	(1,385	)	$	(12,268	)

	Three Months Ended March 31, 2018
	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 January 1, 2018	$	(7,638	)	$	2,158		$	441	$	(5,039	)
Reclassification of stranded tax effects due to adoption of accounting principle ⁽⁴⁾		(1,307	)		478			—		(829	)
Adjusted beginning balance		(8,945	)		2,636			441		(5,868	)
Current period other comprehensive income (loss):
Other comprehensive income before reclassifications		1,578			—			445		2,023
Amounts reclassified from accumulated other comprehensive income		—			(120	)		—		(120	)
Effect of taxes⁽³⁾		(341	)		47			—		(294	)
Total current period other comprehensive (loss) income		1,237			(73	)		445		1,609
Accumulated other comprehensive (loss) income at March 31, 2018	$	(7,708	)	$	2,563		$	886	$	(4,259	)

(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.

(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 August 31, 2023.

(3)

The Company’s effective tax rate for the three months ended March 31, 2019 and 2018 was 19.5% and 22.5%, respectively.

(4)

The Company has adjusted the balance at December 31, 2017 of accumulated other comprehensive loss for the stranded tax effects caused by the enactment of the Tax Act.

(5)

The fair value of the fixed interest rate swap asset is included in other liabilities on the consolidated balance sheet.

Stockholders' Equity

3 Months Ended

Mar. 31, 2019

Stockholders Equity Note [Abstract]

Stockholders' Equity

NOTE 7 – STOCKHOLDERS’ EQUITY

Changes in stockholders’ equity for the three months ended March 31, 2019 and 2018 are as follows:

	Three Months Ended March 31, 2019
	Common Stock					Additional Paid-in		Retained			Treasury Stock					Accumulated Other Comprehensive
	Shares			Amount		Capital		Earnings			Shares		Amount			Loss			Total
Balance at January 1, 2019		18,817		$	22	$	326,208	$	486,442			3,629	$	(139,704	)	$	(12,551	)	$	660,417
Net income		—			—		—		15,318			—		—			—			15,318
Other comprehensive income		—			—		—		—			—		—			283			283
Equity compensation		—			—		4,151		—			—		—			—			4,151
Exercise of stock options		11			—		404		—			—		—			—			404
Issuance of shares pursuant to vesting of stock units		255			1		—		—			—		—			—			1
Net payments for stock issuances and buybacks		(217	)		—		—		—			217		(15,369	)		—			(15,369	)
Dividends declared		—			—		—		(2,634	)		—		—			—			(2,634	)
Balance at March 31, 2019		18,866		$	23	$	330,763	$	499,126			3,846	$	(155,073	)	$	(12,268	)	$	662,571

	Three Months Ended March 31, 2018
	Common Stock					Additional Paid-in		Retained			Treasury Stock						Accumulated Other Comprehensive
	Shares			Amount		Capital		Earnings			Shares			Amount			Loss			Total
Balance at January 1, 2018		18,662		$	22	$	307,821	$	434,766			3,357		$	(121,540	)	$	(5,039	)	$	616,030
Net income		—			—		—		12,417			—			—			—			12,417
Other comprehensive income		—			—		—		—			—			—			1,609			1,609
Equity compensation		—			—		2,320		—			—			71			—			2,391
Exercise of stock options		76			—		1,800		—			—			—			—			1,800
Issuance of shares pursuant to vesting of stock units		187			—		—		—			(3	)		—			—			—
Net payments for stock issuances and buybacks		(158	)		—		—		—			158			(9,109	)		—			(9,109	)
Reclassification of stranded tax effects due to adoption of accounting principle		—			—		—		829			—			—			(829	)		—
Dividends declared		—			—		—		(2,637	)		—			—			—			(2,637	)
Balance at March 31, 2018		18,767		$	22	$	311,941	$	445,375			3,512		$	(130,578	)	$	(4,259	)	$	622,501

Restricted Cash

3 Months Ended

Mar. 31, 2019

Cash And Cash Equivalents [Abstract]

Restricted Cash

NOTE 8 – RESTRICTED CASH

The following table provides a reconciliation of cash and cash equivalents and restricted cash reported within the consolidated balance sheet for the periods presented to the total of cash, cash equivalents, and restricted cash shown in the consolidated statement of cash flows for the three months ended March 31, 2019 and 2018:

	2019				2018
	Beginning		Ending		Beginning		Ending
Cash and cash equivalents	$	11,694	$	5,689	$	11,809	$	19,292
Restricted cash - current⁽¹⁾		—		—		11,191		—
Restricted cash - non-current		1,292		—		1,266		1,273
Total of cash, cash equivalents, and restricted cash shown in the consolidated statement of cash flows	$	12,986	$	5,689	$	24,266	$	20,565

⁽¹⁾

Restricted cash – current at the beginning of 2018 represents amount held in an escrow account for a business acquisition.

Revenue Recognition

3 Months Ended

Mar. 31, 2019

Disaggregation Of Revenue [Abstract]

Revenue Recognition

NOTE 9 – 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 market revenue information provides insight into the breadth of the Company’s expertise. In classifying revenue by client market, the Company attributes revenue from a client to the market that the Company believes is the client’s primary market. The Company also classifies revenue by the type of entity for which it does business, which is an indicator of the diversity of its client base. The Company attributes revenue generated as a subcontractor to a commercial company as government revenue when the ultimate client is a government agency or department. Finally, 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.

Increases in revenue from energy, environment, and infrastructure client markets, and U.S. state and local governments in the three months ended March 31, 2019 compared to the prior year period were primarily due to work performed on disaster recovery and relief efforts which also caused an increase in revenue generated through time-and-materials contracts. Consumer and financial client market revenue increased primarily due to acquisitions during the prior year.

	Three Months Ended
	March 31, 2019					March 31, 2018
	Dollars		Percent			Dollars		Percent
Client Markets:
Energy, environment, and infrastructure	$	153,651		45	%	$	124,250		41	%
Health, education, and social programs		121,337		35	%		122,928		41	%
Safety and security		29,052		9	%		25,475		8	%
Consumer and financial		37,214		11	%		30,127		10	%
Total	$	341,254		100	%	$	302,780		100	%

	Three Months Ended
	March 31, 2019					March 31, 2018
	Dollars		Percent			Dollars		Percent
Client Type:
U.S. federal government	$	131,823		39	%	$	134,185		44	%
U.S. state and local government		65,522		19	%		31,313		10	%
International government		27,158		8	%		28,767		10	%
Total Government		224,503		66	%		194,265		64	%
Commercial		116,751		34	%		108,515		36	%
Total	$	341,254		100	%	$	302,780		100	%

	Three Months Ended
	March 31, 2019					March 31, 2018
	Dollars		Percent			Dollars		Percent
Contract Mix:
Fixed-price	$	133,534		39	%	$	122,328		40	%
Time-and-materials		156,347		46	%		124,342		41	%
Cost-based		51,373		15	%		56,110		19	%
Total	$	341,254		100	%	$	302,780		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 contact assets (liabilities) increased $22.7 million due primarily to increases in contract assets offset partially by increases in contract liabilities. The increase in contract assets is primarily due to hurricane relief and rebuild work for U.S. state and local governments, which is considered part of the energy, environment and infrastructure client market, and most of which has been performed on time-and-materials agreements. There were no material changes to contract balances due to impairments or business combinations during the period.

	March 31, 2019			December 31, 2018			$ Change			% Change
Contract assets	$	151,805		$	126,688		$	25,117			19.8	%
Contract liabilities		(35,936	)		(33,494	)		(2,442	)		7.3	%
Net contract assets (liabilities)	$	115,869		$	93,194		$	22,675			24.3	%

Performance Obligations:

The Company had $1.4 billion in unfulfilled performance obligations as of March 31, 2019, 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 year.

Income Taxes

3 Months Ended

Mar. 31, 2019

Income Tax Disclosure [Abstract]

Income Taxes

NOTE 10 – INCOME TAXES

The Company’s effective tax rate for the three months ended March 31, 2019 and 2018 was 19.5% and 22.5%, respectively.

The Company is subject to federal income taxes as well as to 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 2015 through 2017 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 2014 to 2017.

The Company’s total liability for unrecognized tax benefits as of March 31, 2019 was $0.2 million. There were $0.2 million in tax positions that, if recognized, would have a favorable impact on the Company’s effective tax rate.

The Company does not recognize accrued interest and penalties related to unrecognized tax benefits as a component of tax expense. 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.

On December 20, 2017, the U.S. Congress passed the Tax Cuts and Jobs Act (the “Tax Act”), which was signed into law on December 22, 2017 and was generally effective beginning January 1, 2018. The Company has been impacted in several ways as a result of the Tax Act, including, but not limited to, a permanent reduction in the federal corporate income tax rate from 35% to 21%. The Company completed the accounting for the tax effects of the enactment of the Tax Act in the fourth quarter of 2018.

The Tax Act subjects U.S. corporations to current tax on global intangible low-taxed income (or “GILTI”) earned by certain foreign subsidiaries. Pursuant to FASB Staff Q&A, Topic 740 No. 5, Accounting for Global Intangible Low-Taxed Income, states that an entity can make an accounting policy election to either recognize deferred taxes for temporary differences expected to reverse as GILTI in future years or provide for the tax expense related to GILTI resulting from those items in the year the tax is incurred. The Company elected in the first quarter of fiscal year 2018 to recognize the resulting tax on GILTI as a period expense in the period the tax is incurred. The GILTI tax provision for the quarter ended March 31, 2019 and 2018 was immaterial.

Accounting for Stock Compensation

3 Months Ended

Mar. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Accounting for Stock Compensation

NOTE 11 – ACCOUNTING FOR STOCK 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”).

On or after the Effective Date, the 2018 Omnibus Plan allows the Company to grant 1,185,000 shares using stock options, stock appreciation rights, restricted stock, restricted stock units (“RSUs”), performance units and performance share awards (“PSAs”), 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 347,629 as of March 31, 2019, 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, 2019, the Company had approximately 915,297 shares available for grant under the 2018 Omnibus Plan. The 2018 Omnibus Plan also gives the Company the ability to issue cash-settled RSUs (“CSRSUs”). The CSRSUs have no impact on the shares available for grant under the Omnibus Plan, nor on the calculated shares used in earnings per share (“EPS”) calculations.

During the three months ended March 31, 2019, the Company granted to its employees 136,480 shares in the form of RSUs with an average grant date fair value of $76.56, and the equivalent value of 95,638 shares in the form of CSRSUs with an average grant date fair value of $76.56. During the three months ended March 31, 2019, the Company also granted 47,290 shares in the form of PSAs to its employees with a grant date fair value of $82.38 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 2019 have a performance period from January 1, 2019 through December 31, 2021 and the performance conditions are consistent with the PSAs granted in prior years.

The Company recognized stock-based compensation expense of $6.7 million and $4.9 million for the three months ended March 31, 2019 and 2018, respectively. Unrecognized compensation expense of approximately $21.3 million as of March 31, 2019 related to unsettled RSUs is expected to be recognized over a weighted-average period of 2.2 years. The unrecognized compensation expense related to CSRSUs totaled approximately $15.0 million at March 31, 2019 and is expected to be recognized over a weighted-average period of 1.9 years. Unrecognized compensation expense related to PSAs of approximately $7.0 million as of March 31, 2019 is expected to be recognized over a weighted-average period of 1.7 years.

Earnings Per Share

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Earnings Per Share

NOTE 12 – 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, 2019, the PSAs granted during the year ended December 31, 2017 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, 2018 and during the three months ended March 31, 2019 have not yet completed their initial two-year performance period and therefore were excluded in the calculation of diluted EPS. There were 31,840 and 26,420 weighted-average shares excluded from the calculation of EPS because they were anti-dilutive for the three months ended March 31, 2019 and 2018, respectively.

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

	Three Months Ended
	March 31,
	2019		2018
Net Income	$	15,318	$	12,417

Weighted-average number of basic shares outstanding during the period		18,825		18,670
Dilutive effect of stock options, RSUs, and performance shares		438		488
Weighted-average number of diluted shares outstanding during the period		19,263		19,158

Basic earnings per share	$	0.81	$	0.67
Diluted earnings per share	$	0.80	$	0.65

Share Repurchase Program

3 Months Ended

Mar. 31, 2019

Equity [Abstract]

Share Repurchase Program

NOTE 13 – SHARE REPURCHASE PROGRAM

The Company’s current 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. 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 3.25 to 1.00. As of March 31, 2019, $77.5 million remained available for share repurchases under the approved share repurchase program.

Subsequent Events

3 Months Ended

Mar. 31, 2019

Subsequent Events [Abstract]

Subsequent Events

NOTE 14 – SUBSEQUENT EVENTS

On May 2, 2019, the Company’s board of directors approved a $0.14 per share cash dividend. The dividend will be paid on July 16, 2019 to shareholders of record as of the close of business on June 14, 2019.

Contingencies

3 Months Ended

Mar. 31, 2019

Commitments And Contingencies Disclosure [Abstract]

Contingencies

NOTE 15 – 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. The State of Louisiana separately supplemented the amount of recovery it is seeking 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 seeks 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 and stated that his deferral would not be deemed to grant or deny any portion of the OCD’s claim. The Commissioner subsequently 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 and intends to vigorously defend its position. The Company has therefore not recorded a liability.

Basis of Presentation and Nature of Operations (Policies)

3 Months Ended

Mar. 31, 2019

Accounting Policies [Abstract]

Basis of Presentation

Leases

Recent Accounting Pronouncements

Recent Accounting Pronouncements Adopted

Leases

	January 1, 2019
	Before Adoption		Adoption Adjustments			After Adoption
Operating lease - right-of-use assets	$	—	$	137,152		$	137,152
Operating lease liabilities - current		—		30,951			30,951
Accrued expenses and other current liabilities		1,843		(1,843	)		—
Operating lease liabilities - non-current		—		121,982			121,982
Deferred rent		13,938		(13,938	)		—

Stock Compensation

Recent Accounting Pronouncements Not Yet Adopted

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

Basis of Presentation and Nature of Operations (Tables)

3 Months Ended

Mar. 31, 2019

Accounting Policies [Abstract]

Schedule of Impact to Consolidated Balance Sheets Before and After the Adoption

	January 1, 2019
	Before Adoption		Adoption Adjustments			After Adoption
Operating lease - right-of-use assets	$	—	$	137,152		$	137,152
Operating lease liabilities - current		—		30,951			30,951
Accrued expenses and other current liabilities		1,843		(1,843	)		—
Operating lease liabilities - non-current		—		121,982			121,982
Deferred rent		13,938		(13,938	)		—

Contract Receivables, Net (Tables)

3 Months Ended

Mar. 31, 2019

Receivables [Abstract]

Summary of Contract Receivables, Net

Contract receivables, net consisted of the following:

	March 31, 2019			December 31, 2018
Billed and billable	$	227,583		$	236,250
Allowance for doubtful accounts		(5,111	)		(5,284	)
Contract receivables, net	$	222,472		$	230,966

Goodwill (Tables)

3 Months Ended

Mar. 31, 2019

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, 2019 were as follows:

Balance as of December 31, 2018	$	715,644
Goodwill resulting from business combination - Olson⁽¹⁾		3,047
Goodwill resulting from business combination - We Are Vista ⁽²⁾		579
Effect of foreign currency translation		1,090
Balance as of March 31, 2019	$	720,360

⁽¹⁾

⁽²⁾

Goodwill measurement period adjustment related to the settlement of the working capital adjustment under the purchase agreement.

Leases (Tables)

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Summary of Operating Leases

Operating leases consisted of the following at March 31, 2019:

Real estate facilities	$	132,596
Office equipment		2,062
Other		486
		135,144
Amortization of right-of-use assets		(7,557	)
Total operating lease right-of-use assets	$	127,587

Summary of Rent Expense

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

	Three Months Ended
	March 31, 2019
Operating lease costs	$	8,896
Short-term lease costs		681
Variable lease costs		12
Total operating lease costs		9,589
Sublease income		—
Total rent expense	$	9,589

Summary of Future Minimum Lease Payments Under Non-Cancellable Leases

Future minimum lease payments under non-cancellable leases as of March 31, 2019 were as follows:

March 31, 2020	$	34,825
March 31, 2021		32,970
March 31, 2022		31,653
March 31, 2023		25,967
March 31, 2024		13,065
Thereafter		18,694
Total future minimum lease payments		157,174
Less: Interest		(14,174	)
Total operating lease liabilities	$	143,000

Operating lease liabilities - current	$	30,324
Operating lease liabilities - non-current		112,676
Total operating lease liabilities	$	143,000

Summary of Other Information Related to Operating Leases

Other information related to operating leases is as follows:

	Three Months Ended
	March 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	9,389
Right-of-use assets obtained in exchange for new operating lease liabilities	$	2,159
Weighted-average remaining lease term - operating leases		5.1
Weighted-average discount rate - operating leases		3.8	%

Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2019

Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]

Components of Other Comprehensive Income and Components of Accumulated Other Comprehensive Loss

	Three Months Ended March 31, 2019
	Foreign Currency Translation Adjustments			Gain on Sale of Interest Rate Hedge Agreement ⁽¹⁾			Change in Fair Value of Interest Rate Hedge Agreements ⁽²⁾⁽⁵⁾			Total
Accumulated other comprehensive (loss) income at January 1, 2019	$	(14,168	)	$	2,164		$	(547	)	$	(12,551	)
Current period other comprehensive (loss) income:
Other comprehensive income (loss) before reclassifications		1,254			—			(1,164	)		90
Amounts reclassified from accumulated other comprehensive income		—			(180	)		23			(157	)
Effect of taxes⁽³⁾		—			47			303			350
Total current period other comprehensive (loss) income		1,254			(133	)		(838	)		283
Accumulated other comprehensive (loss) income at March 31, 2019	$	(12,914	)	$	2,031		$	(1,385	)	$	(12,268	)

	Three Months Ended March 31, 2018
	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 January 1, 2018	$	(7,638	)	$	2,158		$	441	$	(5,039	)
Reclassification of stranded tax effects due to adoption of accounting principle ⁽⁴⁾		(1,307	)		478			—		(829	)
Adjusted beginning balance		(8,945	)		2,636			441		(5,868	)
Current period other comprehensive income (loss):
Other comprehensive income before reclassifications		1,578			—			445		2,023
Amounts reclassified from accumulated other comprehensive income		—			(120	)		—		(120	)
Effect of taxes⁽³⁾		(341	)		47			—		(294	)
Total current period other comprehensive (loss) income		1,237			(73	)		445		1,609
Accumulated other comprehensive (loss) income at March 31, 2018	$	(7,708	)	$	2,563		$	886	$	(4,259	)

(1)

(2)

(3)

The Company’s effective tax rate for the three months ended March 31, 2019 and 2018 was 19.5% and 22.5%, respectively.

(4)

The Company has adjusted the balance at December 31, 2017 of accumulated other comprehensive loss for the stranded tax effects caused by the enactment of the Tax Act.

(5)

The fair value of the fixed interest rate swap asset is included in other liabilities on the consolidated balance sheet.

Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2019

Stockholders Equity Note [Abstract]

Schedule of Changes in Stockholders' Equity

Changes in stockholders’ equity for the three months ended March 31, 2019 and 2018 are as follows:

	Three Months Ended March 31, 2019
	Common Stock					Additional Paid-in		Retained			Treasury Stock					Accumulated Other Comprehensive
	Shares			Amount		Capital		Earnings			Shares		Amount			Loss			Total
Balance at January 1, 2019		18,817		$	22	$	326,208	$	486,442			3,629	$	(139,704	)	$	(12,551	)	$	660,417
Net income		—			—		—		15,318			—		—			—			15,318
Other comprehensive income		—			—		—		—			—		—			283			283
Equity compensation		—			—		4,151		—			—		—			—			4,151
Exercise of stock options		11			—		404		—			—		—			—			404
Issuance of shares pursuant to vesting of stock units		255			1		—		—			—		—			—			1
Net payments for stock issuances and buybacks		(217	)		—		—		—			217		(15,369	)		—			(15,369	)
Dividends declared		—			—		—		(2,634	)		—		—			—			(2,634	)
Balance at March 31, 2019		18,866		$	23	$	330,763	$	499,126			3,846	$	(155,073	)	$	(12,268	)	$	662,571

	Three Months Ended March 31, 2018
	Common Stock					Additional Paid-in		Retained			Treasury Stock						Accumulated Other Comprehensive
	Shares			Amount		Capital		Earnings			Shares			Amount			Loss			Total
Balance at January 1, 2018		18,662		$	22	$	307,821	$	434,766			3,357		$	(121,540	)	$	(5,039	)	$	616,030
Net income		—			—		—		12,417			—			—			—			12,417
Other comprehensive income		—			—		—		—			—			—			1,609			1,609
Equity compensation		—			—		2,320		—			—			71			—			2,391
Exercise of stock options		76			—		1,800		—			—			—			—			1,800
Issuance of shares pursuant to vesting of stock units		187			—		—		—			(3	)		—			—			—
Net payments for stock issuances and buybacks		(158	)		—		—		—			158			(9,109	)		—			(9,109	)
Reclassification of stranded tax effects due to adoption of accounting principle		—			—		—		829			—			—			(829	)		—
Dividends declared		—			—		—		(2,637	)		—			—			—			(2,637	)
Balance at March 31, 2018		18,767		$	22	$	311,941	$	445,375			3,512		$	(130,578	)	$	(4,259	)	$	622,501

Restricted Cash (Tables)

3 Months Ended

Mar. 31, 2019

Restricted Cash And Cash Equivalents Current [Abstract]

Reconciliation of Cash and Cash Equivalents, and Restricted Cash

	2019				2018
	Beginning		Ending		Beginning		Ending
Cash and cash equivalents	$	11,694	$	5,689	$	11,809	$	19,292
Restricted cash - current⁽¹⁾		—		—		11,191		—
Restricted cash - non-current		1,292		—		1,266		1,273
Total of cash, cash equivalents, and restricted cash shown in the consolidated statement of cash flows	$	12,986	$	5,689	$	24,266	$	20,565

⁽¹⁾

Restricted cash – current at the beginning of 2018 represents amount held in an escrow account for a business acquisition.

Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 2019

Disaggregation Of Revenue [Abstract]

Disaggregation of Revenue

	Three Months Ended
	March 31, 2019					March 31, 2018
	Dollars		Percent			Dollars		Percent
Client Markets:
Energy, environment, and infrastructure	$	153,651		45	%	$	124,250		41	%
Health, education, and social programs		121,337		35	%		122,928		41	%
Safety and security		29,052		9	%		25,475		8	%
Consumer and financial		37,214		11	%		30,127		10	%
Total	$	341,254		100	%	$	302,780		100	%

	Three Months Ended
	March 31, 2019					March 31, 2018
	Dollars		Percent			Dollars		Percent
Client Type:
U.S. federal government	$	131,823		39	%	$	134,185		44	%
U.S. state and local government		65,522		19	%		31,313		10	%
International government		27,158		8	%		28,767		10	%
Total Government		224,503		66	%		194,265		64	%
Commercial		116,751		34	%		108,515		36	%
Total	$	341,254		100	%	$	302,780		100	%

	Three Months Ended
	March 31, 2019					March 31, 2018
	Dollars		Percent			Dollars		Percent
Contract Mix:
Fixed-price	$	133,534		39	%	$	122,328		40	%
Time-and-materials		156,347		46	%		124,342		41	%
Cost-based		51,373		15	%		56,110		19	%
Total	$	341,254		100	%	$	302,780		100	%

Schedule of Contract Balances and Changes in Contract Balances

Contract Balances:

	March 31, 2019			December 31, 2018			$ Change			% Change
Contract assets	$	151,805		$	126,688		$	25,117			19.8	%
Contract liabilities		(35,936	)		(33,494	)		(2,442	)		7.3	%
Net contract assets (liabilities)	$	115,869		$	93,194		$	22,675			24.3	%

Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2019

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,
	2019		2018
Net Income	$	15,318	$	12,417

Weighted-average number of basic shares outstanding during the period		18,825		18,670
Dilutive effect of stock options, RSUs, and performance shares		438		488
Weighted-average number of diluted shares outstanding during the period		19,263		19,158

Basic earnings per share	$	0.81	$	0.67
Diluted earnings per share	$	0.80	$	0.65

Basis of Presentation and Nature of Operations - Additional Information (Details)	3 Months Ended
	Mar. 31, 2019 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	65
International \| Minimum
Basis of Presentation and Nature of Operations [Line Items]
Number of offices \| Office	15

Basis of Presentation and Nature of Operations - Schedule of Impact to Consolidated Balance Sheets Before and After the Adoption (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Basis of Presentation and Nature of Operations [Line Items]
Operating lease - right-of-use assets	$ 127,587
Operating lease liabilities - current	30,324
Accrued expenses and other current liabilities	27,902		$ 39,072
Operating lease liabilities - non-current	$ 112,676
Deferred rent			$ 13,938
Accounting Standards Update 2016-02
Basis of Presentation and Nature of Operations [Line Items]
Operating lease - right-of-use assets		$ 137,152
Operating lease liabilities - current		30,951
Operating lease liabilities - non-current		121,982
Accounting Standards Update 2016-02 \| Before Adoption
Basis of Presentation and Nature of Operations [Line Items]
Accrued expenses and other current liabilities		1,843
Deferred rent		13,938
Accounting Standards Update 2016-02 \| Adoption Adjustments
Basis of Presentation and Nature of Operations [Line Items]
Operating lease - right-of-use assets		137,152
Operating lease liabilities - current		30,951
Accrued expenses and other current liabilities		(1,843)
Operating lease liabilities - non-current		121,982
Deferred rent		$ (13,938)

Contract Receivables, Net - Summary of Contract Receivables, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Billed and billable	$ 227,583	$ 236,250
Allowance for doubtful accounts	(5,111)	(5,284)
Contract receivables, net	$ 222,472	$ 230,966

Goodwill - Schedule of Changes in Carrying Amount of Goodwill (Details)
$ in Thousands

3 Months Ended

Mar. 31, 2019

USD ($)

Goodwill [Line Items]

Balance as of December 31, 2018

$ 715,644

Effect of foreign currency translation

1,090

Balance as of March 31, 2019

720,360

Olson

Goodwill [Line Items]

Goodwill resulting from business combinations

3,047

^[1]

Vista Limited

Goodwill [Line Items]

Goodwill resulting from business combinations

$ 579

^[2]

[1]	In 2019, the Company recorded changes to goodwill representing an immaterial correction of an error for income tax balances related to acquired assets and liabilities from the business combination that occurred in 2014. These balances were not significant to our previously reported financial position.
[2]	Goodwill measurement period adjustment related to the settlement of the working capital adjustment under the purchase agreement.

Long-Term Debt - Additional Information (Details)		3 Months Ended
Long-Term Debt - Additional Information (Details)	May 17, 2017 USD ($) Bank	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2018
Debt Instrument [Line Items]
Credit facility syndication, number of commercial banks \| Bank	11
Line of credit facility, expiration date		May 17, 2022
Line of credit facility, maximum borrowing capacity without borrowing base requirement	$ 600,000,000
Line of credit facility, accordion feature, additional revolving credit commitments under existing loan facility	300,000,000
Line of credit facility, maximum borrowing capacity	$ 60,000,000
Line of credit facility, interest coverage ratio covenant	300.00%
Line of credit facility, leverage ratio covenant	375.00%
Long-term debt		$ 232,318,000	$ 200,424,000
Number of letters of credit, outstanding		10
Letters of credit outstanding, amount		$ 3,100,000
Line of credit facility, remaining borrowing capacity		364,600,000
Line of credit facility, current borrowing capacity		$ 273,900,000
Long-term debt, weighted average interest rate, at point in time		3.76%		2.84%
Minimum
Debt Instrument [Line Items]
Line of Credit Facility, Committement Fee Unused Capacity	0.13%
Maximum
Debt Instrument [Line Items]
Line of Credit Facility, Committement Fee Unused Capacity	0.25%
Federal Funds Open Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.50%
London Interbank Offered Rate (LIBOR) \| Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.00%
London Interbank Offered Rate (LIBOR) \| Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.00%

Leases - Additional Information (Details) $ in Millions	3 Months Ended
Leases - Additional Information (Details) $ in Millions	Mar. 31, 2019 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	$ 16.6
Minimum
Lessee Lease Description [Line Items]
Operating leases, remaining lease term	1 year
Additional operating leases not yet commenced, lease terms	1 year
Maximum
Lessee Lease Description [Line Items]
Operating leases, remaining lease term	29 years
Operating leases, extendable lease term	5 years
Operating leases, termination lease term	1 year
Additional operating leases not yet commenced, lease terms	28 years

Leases - Summary of Operating Leases (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Lessee Lease Description [Line Items]
Operating lease right of use assets, gross	$ 135,144
Amortization of right-of-use assets	(7,557)
Total operating lease right-of-use assets	127,587
Real Estate Facilities
Lessee Lease Description [Line Items]
Operating lease right of use assets, gross	132,596
Office Equipment
Lessee Lease Description [Line Items]
Operating lease right of use assets, gross	2,062
Other
Lessee Lease Description [Line Items]
Operating lease right of use assets, gross	$ 486

Leases - Summary of Rent Expense (Details) $ in Thousands	3 Months Ended
Leases - Summary of Rent Expense (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Leases [Abstract]
Operating lease costs	$ 8,896
Short-term lease costs	681
Variable lease costs	12
Total operating lease costs	9,589
Total rent expense	$ 9,589

Leases - Summary of Future Minimum Lease Payments Under Non-Cancellable Leases (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Leases [Abstract]
March 31, 2020	$ 34,825
March 31, 2021	32,970
March 31, 2022	31,653
March 31, 2023	25,967
March 31, 2024	13,065
Thereafter	18,694
Total future minimum lease payments	157,174
Less: Interest	(14,174)
Total operating lease liabilities	143,000
Operating lease liabilities - current	30,324
Operating lease liabilities - non-current	112,676
Total operating lease liabilities	$ 143,000

Leases - Summary of Other Information Related to Operating Leases (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases [Abstract]
Operating cash flows from operating leases	$ 9,389
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 2,159
Weighted-average remaining lease term - operating leases	5 years 1 month 6 days
Weighted-average discount rate - operating leases	3.80%

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

3 Months Ended

Mar. 31, 2019

Mar. 31, 2018

Dec. 31, 2017

Accumulated Other Comprehensive Income Loss [Line Items]

Balance

$ 660,417

$ 616,030

Current period other comprehensive (loss) income:

Total current period other comprehensive (loss) income

283

1,609

Balance

662,571

622,501

Foreign Currency Translation Adjustments

Accumulated Other Comprehensive Income Loss [Line Items]

Balance

(14,168)

(7,638)

Reclassification of stranded tax effects due to adoption of accounting principle

^[1]

(1,307)

Adjusted beginning balance

$ (8,945)

Current period other comprehensive (loss) income:

Other comprehensive income (loss) before reclassifications

1,254

1,578

Effect of taxes

^[2]

(341)

Total current period other comprehensive (loss) income

1,254

1,237

Balance

(12,914)

(7,708)

Gain on Sale of Interest Rate Hedge Agreement

Accumulated Other Comprehensive Income Loss [Line Items]

Balance

^[3]

2,164

2,158

Reclassification of stranded tax effects due to adoption of accounting principle

^[1],[3]

478

Adjusted beginning balance

^[3]

2,636

Current period other comprehensive (loss) income:

Amounts reclassified from accumulated other comprehensive income

^[3]

(180)

(120)

Effect of taxes

^[2],[3]

Total current period other comprehensive (loss) income

^[3]

(133)

(73)

Balance

^[3]

2,031

2,563

Change in Fair Value of Interest Rate Hedge Agreements

Accumulated Other Comprehensive Income Loss [Line Items]

Balance

^[4]

(547)

^[5]

441

Adjusted beginning balance

^[4]

441

Current period other comprehensive (loss) income:

Other comprehensive income (loss) before reclassifications

^[4]

(1,164)

^[5]

445

Amounts reclassified from accumulated other comprehensive income

^[4],[5]

Effect of taxes

^[2],[4],[5]

303

Total current period other comprehensive (loss) income

^[4]

(838)

^[5]

445

Balance

^[4]

(1,385)

^[5]

886

Accumulated Other Comprehensive Loss

Accumulated Other Comprehensive Income Loss [Line Items]

Balance

(12,551)

(5,039)

Reclassification of stranded tax effects due to adoption of accounting principle

^[1]

(829)

Adjusted beginning balance

$ (5,868)

Current period other comprehensive (loss) income:

Other comprehensive income (loss) before reclassifications

2,023

Amounts reclassified from accumulated other comprehensive income

(157)

(120)

Effect of taxes

^[2]

350

(294)

Total current period other comprehensive (loss) income

283

1,609

Balance

$ (12,268)

$ (4,259)

[1]	The Company has adjusted the balance at December 31, 2017 of accumulated other comprehensive loss for the stranded tax effects caused by the enactment of the Tax Act.
[2]	The Company’s effective tax rate for the three months ended March 31, 2019 and 2018 was 19.5% and 22.5%, respectively.
[3]	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.
[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 August 31, 2023.
[5]	The fair value of the fixed interest rate swap asset is included in other liabilities on the consolidated balance sheet.

Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Parenthetical) (Details)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]
Effective tax rate	19.50%	22.50%

Stockholders' Equity - Schedule of Changes in Stockholders' Equity (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Balance	$ 660,417	$ 616,030
Net income	15,318	12,417
Other comprehensive income	283	1,609
Equity compensation	4,151	2,391
Exercise of stock options	404	1,800
Issuance of shares pursuant to vesting of stock units	1
Net payments for stock issuances and buybacks	(15,369)	(9,109)
Dividends declared	(2,634)	(2,637)
Balance	662,571	622,501
Common Stock
Balance	$ 22	$ 22
Balance (in shares)	18,817	18,662
Exercise of stock options (in shares)	11	76
Issuance of shares pursuant to vesting of stock units	$ 1
Issuance of shares pursuant to vesting of stock units (in shares)	255	187
Net payments for stock issuances and buybacks (in shares)	(217)	(158)
Balance	$ 23	$ 22
Balance (in shares)	18,866	18,767
Additional Paid-in Capital
Balance	$ 326,208	$ 307,821
Equity compensation	4,151	2,320
Exercise of stock options	404	1,800
Balance	330,763	311,941
Retained Earnings
Balance	486,442	434,766
Net income	15,318	12,417
Reclassification of stranded tax effects due to adoption of accounting principle		829
Dividends declared	(2,634)	(2,637)
Balance	499,126	445,375
Treasury Stock
Balance	$ (139,704)	$ (121,540)
Balance (in shares)	3,629	3,357
Equity compensation		$ 71
Issuance of shares pursuant to vesting of stock units (in shares)		(3)
Net payments for stock issuances and buybacks	$ (15,369)	$ (9,109)
Net payments for stock issuances and buybacks (in shares)	217	158
Balance	$ (155,073)	$ (130,578)
Balance (in shares)	3,846	3,512
Accumulated Other Comprehensive Loss
Balance	$ (12,551)	$ (5,039)
Other comprehensive income	283	1,609
Reclassification of stranded tax effects due to adoption of accounting principle		(829)
Balance	$ (12,268)	$ (4,259)

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, 2019

Dec. 31, 2018

Mar. 31, 2018

Dec. 31, 2017

Cash And Cash Equivalents [Abstract]

Cash and cash equivalents

$ 5,689

$ 11,694

$ 19,292

$ 11,809

Restricted cash - current

^[1]

11,191

Restricted cash - non-current

1,292

1,273

1,266

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

$ 5,689

$ 12,986

$ 20,565

$ 24,266

[1]	Restricted cash – current at the beginning of 2018 represents amount held in an escrow account for a business acquisition.

Revenue Recognition - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Revenue from clients	$ 341,254	$ 302,780
Fixed-Price
Disaggregation Of Revenue [Line Items]
Revenue from clients	133,534	122,328
Time-and-Materials
Disaggregation Of Revenue [Line Items]
Revenue from clients	156,347	124,342
Cost-Based
Disaggregation Of Revenue [Line Items]
Revenue from clients	51,373	56,110
U.S. Federal Government
Disaggregation Of Revenue [Line Items]
Revenue from clients	131,823	134,185
U.S. State and Local Government
Disaggregation Of Revenue [Line Items]
Revenue from clients	65,522	31,313
International Government
Disaggregation Of Revenue [Line Items]
Revenue from clients	27,158	28,767
Total Government
Disaggregation Of Revenue [Line Items]
Revenue from clients	224,503	194,265
Commercial
Disaggregation Of Revenue [Line Items]
Revenue from clients	$ 116,751	$ 108,515
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 \| Fixed-Price
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	39.00%	40.00%
Customer Concentration Risk \| Revenue from Contract with Customer \| Time-and-Materials
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	46.00%	41.00%
Customer Concentration Risk \| Revenue from Contract with Customer \| Cost-Based
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	15.00%	19.00%
Customer Concentration Risk \| Revenue from Contract with Customer \| U.S. Federal Government
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	39.00%	44.00%
Customer Concentration Risk \| Revenue from Contract with Customer \| U.S. State and Local Government
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	19.00%	10.00%
Customer Concentration Risk \| Revenue from Contract with Customer \| International Government
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	8.00%	10.00%
Customer Concentration Risk \| Revenue from Contract with Customer \| Total Government
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	66.00%	64.00%
Customer Concentration Risk \| Revenue from Contract with Customer \| Commercial
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	34.00%	36.00%
Energy Environmental And Infrastructure
Disaggregation Of Revenue [Line Items]
Revenue from clients	$ 153,651	$ 124,250
Energy Environmental And Infrastructure \| Customer Concentration Risk \| Revenue from Contract with Customer
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	45.00%	41.00%
Health Education And Social Programs
Disaggregation Of Revenue [Line Items]
Revenue from clients	$ 121,337	$ 122,928
Health Education And Social Programs \| Customer Concentration Risk \| Revenue from Contract with Customer
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	35.00%	41.00%
Safety And Security
Disaggregation Of Revenue [Line Items]
Revenue from clients	$ 29,052	$ 25,475
Safety And Security \| Customer Concentration Risk \| Revenue from Contract with Customer
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	9.00%	8.00%
Consumer And Financial
Disaggregation Of Revenue [Line Items]
Revenue from clients	$ 37,214	$ 30,127
Consumer And Financial \| Customer Concentration Risk \| Revenue from Contract with Customer
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	11.00%	10.00%

Revenue Recognition - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Disaggregation Of Revenue [Abstract]
Net contract assets (liabilities)	$ 22,675

Revenue Recognition - Schedule of Changes in Contract Balances Due to Adoption of New Accounting Standards (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Revenue From Contract With Customer [Abstract]
Contract assets	$ 151,805	$ 126,688
Contract liabilities	(35,936)	(33,494)
Net contract assets (liabilities)	115,869	$ 93,194
Change in contract assets	25,117
Change in contract liabilities	(2,442)
Change in net contract assets (liabilities)	$ 22,675
Percentage of change in contract assets	19.80%
Percentage of change in contract liabilities	7.30%
Percentage of change in net contract assets (liabilities)	24.30%

Revenue Recognition - Additional Information (Detail1) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-04-01 $ in Billions	Mar. 31, 2019 USD ($)
Revenue From Contract With Customer [Line Items]
Unfulfilled performance obligation	$ 1.4
Expected period to satisfy performance obligations	1 year

Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Effective income tax rate reconciliation, percent	19.50%	22.50%
Unrecognized tax benefits	$ 0.2
Unrecognized tax benefits that would impact effective tax rate	$ 0.2
Federal corporate income tax rate	21.00%		35.00%
Internal Revenue Service (IRS) \| Earliest Tax Year
Income Taxes [Line Items]
Open tax year	2015
Internal Revenue Service (IRS) \| Latest Tax Year
Income Taxes [Line Items]
Open tax year	2017
State Local and Foreign Jurisdictions \| Earliest Tax Year
Income Taxes [Line Items]
Open tax year	2014
State Local and Foreign Jurisdictions \| Latest Tax Year
Income Taxes [Line Items]
Open tax year	2017

Accounting for Stock Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Apr. 04, 2018	Mar. 31, 2019	Mar. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Allocated share-based compensation expense		$ 6.7	$ 4.9
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		136,480
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value		$ 76.56
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized		$ 21.3
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition		2 years 2 months 12 days
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		95,638
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value		$ 76.56
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized		$ 15.0
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition		1 year 10 months 24 days
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		47,290
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value		$ 82.38
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized		$ 7.0
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	1,185,000	347,629
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		915,297

Earnings Per Share - Additional Information (Details) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Antidilutive securities excluded from computation of earnings per share, amount	31,840	26,420
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, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net Income	$ 15,318	$ 12,417
Weighted-average number of basic shares outstanding during the period	18,825	18,670
Dilutive effect of stock options, RSUs, and performance shares	438	488
Weighted-average number of diluted shares outstanding during the period	19,263	19,158
Basic earnings per share	$ 0.81	$ 0.67
Diluted earnings per share	$ 0.80	$ 0.65

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(19))
-URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1337-109256

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 52
-URI http://asc.fasb.org/extlink&oid=109256448&loc=d3e4984-109258

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(21))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1252-109256

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(23))
-URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 60B
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109260490&loc=SL5780133-109256

+ Details

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 52
-URI http://asc.fasb.org/extlink&oid=109256448&loc=d3e4984-109258

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1252-109256

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(23))
-URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1337-109256

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(21))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 60B
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109260490&loc=SL5780133-109256

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(19))
-URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263

+ Details

- Definition

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

+ References + Details

Share Repurchase Program - Additional Information (Details)	Mar. 31, 2019 USD ($)
Equity [Abstract]
Stock repurchase program, authorized amount	$ 100,000,000
Line of credit facility, condition permited for unlimited share repurchases, leverage ratio	3.25
Stock repurchase program, remaining authorized repurchase amount	$ 77,500,000

Subsequent Events - Additional Information (Details) - Subsequent Event	May 02, 2019 $ / shares
Subsequent Event [Line Items]
Dividend declaration date	May 02, 2019
Cash dividend per share	$ 0.14
Dividend payment date	Jul. 16, 2019
Dividend close of record date	Jun. 14, 2019

Contingencies - Additional Information (Details) - USD ($) $ in Millions	Jun. 10, 2016	Mar. 31, 2019
Loss Contingencies [Line Items]
Community development related to claim		$ 220.2
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