ICF International (ICFI) 10-Q 5 May 21 2021 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	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 (UN

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	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		23	23
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 (_2

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 COMP

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

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 Natur

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.

Restricted Cash

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) 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.”

Contract Receivables, Net

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

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

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

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 (i) As a result, the Credit Facility now consists of (i) 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) 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 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

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.

Derivative instruments and Hedg

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 – 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

Income Taxes	3 Months Ended
	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	NOTE 9 – 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.

Accumulated Other Comprehensive

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

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 Comp

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 2.0 1.7

Business Combination

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

Earnings Per Share

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 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

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

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

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2021
Subsequent Events [Abstract]
Subsequent Events	NOTE 17 – 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

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2021
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE 18 – 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 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 Nat_2

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.

Restricted Cash (Tables)

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	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) 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.”

Contract Receivables, Net (Tabl

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)

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)

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)

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

Revenue Recognition (Tables)

Revenue Recognition (Tables)	3 Months Ended
	Mar. 31, 2021
Revenue From Contract With Customer [Abstract]
Disaggregation of Revenue	Disaggregation of Revenue 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 %
Schedule of Contract Balances and Changes in Contract Balances	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 %

Derivative instruments and He_2

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) 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.

Accumulated Other Comprehensi_2

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) 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 (Tables)

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)

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)

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

Basis of Presentation and Nat_3

Basis of Presentation and Nature of Operations - Additional Information (Details)	3 Months Ended
	Mar. 31, 2021OfficeSegment
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 - Reconciliatio

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]	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.”

Contract Receivables, Net - Sum

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

Goodwill - Schedule of Changes in Carrying Amount of Goodwill (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)
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

Leases - Additional Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021USD ($)
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 L

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 Expens

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 Mini

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 Infor

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 Lo

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 Inf

Long-Term Debt - Additional Information (Details)	Mar. 03, 2020USD ($)Bank	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)
Debt Instrument [Line Items]
Credit facility group, number of commercial banks | Bank	10
Line of credit facility, expiration date		Mar. 3, 2025
Line of credit facility, swing line commitment amount	$ 25,000,000
Line of credit facility, maximum borrowing capacity	60,000,000
Line of credit facility, additional revolving credit commitments under existing loan facility	$ 300,000,000
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
Term Loan
Debt Instrument [Line Items]
Debt instrument, principal amount	200,000,000
Line of credit facility	200,000,000
Swing Line Loans
Debt Instrument [Line Items]
Line of credit facility	75,000,000
Maximum
Debt Instrument [Line Items]
Line of credit facility, swing line commitment amount	$ 75,000,000
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 Fu

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 - Disaggreg

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 - Additiona

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

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 - Additio_2

Revenue Recognition - Additional Information (Detail1) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-04-01 $ in Billions	Mar. 31, 2021USD ($)
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 He_3

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	$ 50	$ 25	$ 100
Paid Fixed Interest Rate%	1.294%	2.854%	1.8475%
Beginning Dates of Effected Cash Flows	Feb. 28, 2020	Aug. 31, 2018	Aug. 31, 2018	Jan. 31, 2018
Ending Dates of Effected Cash Flows	Feb. 28, 2025	Aug. 31, 2023	Aug. 31, 2023	Jan. 31, 2023
Interest Rate Swap 2.8510% Paid Rate
Derivative [Line Items]
Notional Amount		$ 25
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]	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 - Additional Infor

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 Comprehensi_3

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)	(180)
Effect of taxes	[1],[2]	49	47
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	50
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 Comprehensi_4

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

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 Co_2

Accounting for Stock-based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	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 - Additio

Business Combinations - Additional Information (Details) - ITG - Indemnity $ in Millions	Jan. 31, 2020	Dec. 31, 2022USD ($)	Mar. 31, 2021Payment
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

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 o

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

Share Repurchase Program - Addi

Share Repurchase Program - Additional Information (Details)	3 Months Ended
	Mar. 31, 2021USD ($)shares	Mar. 31, 2020USD ($)shares
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, authorized amount	$ 100,000,000
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 Financ

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

Subsequent Events - Additional Information (Details) - Subsequent Event	May 04, 2021$ / shares
Subsequent Event [Line Items]
Dividend declaration date	May 4, 2021
Cash dividend per share	$ 0.14
Dividend payment date	Jul. 14, 2021
Dividend record date	Jun. 11, 2021

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	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