ICF International (ICFI) 10-Q 3 Nov 23 2023 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2023	Oct. 27, 2023
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		18,816,914
Document Type	10-Q
Document Period End Date	Sep. 30, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
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	1902 Reston Metro Plaza
Entity Address, City or Town	Reston,
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	20190
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	Sep. 30, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 5,084	$ 11,257
Restricted cash	2,770	1,711
Contract receivables, net	214,818	232,337
Contract assets	209,267	169,088
Prepaid expenses and other assets	34,294	40,709
Income tax receivable	11,175	11,616
Total Current Assets	477,408	466,718
Property and Equipment, net	78,706	85,402
Other Assets:
Goodwill	1,219,326	1,212,898
Other intangible assets, net	103,211	126,537
Operating lease - right-of-use assets	134,172	149,066
Other assets	42,297	51,637
Total Assets	2,055,120	2,092,258
Current Liabilities:
Current portion of long-term debt	23,250	23,250
Accounts payable	123,414	135,778
Contract liabilities	16,989	25,773
Operating lease liabilities	19,230	19,305
Finance lease liabilities	2,441	2,381
Accrued salaries and benefits	77,123	85,991
Accrued subcontractors and other direct costs	42,049	45,478
Accrued expenses and other current liabilities	64,681	78,036
Total Current Liabilities	369,177	415,992
Long-term Liabilities:
Long-term debt	510,687	533,084
Operating lease liabilities - non-current	174,718	182,251
Finance lease liabilities - non-current	14,277	16,116
Deferred income taxes	40,148	68,038
Other long-term liabilities	52,783	23,566
Total Liabilities	1,161,790	1,239,047
Commitments and Contingencies (Note 17)
Stockholders’ Equity:
Preferred stock, par value $.001; 5,000,000 shares authorized; none issued
Common stock, par value $.001; 70,000,000 shares authorized; 23,948,590 and 23,771,596 shares issued at September 30, 2023 and December 31, 2022, respectively; 18,816,914 and 18,883,050 shares outstanding at Septmber 30, 2023 and December 31, 2022, respectively	24	23
Additional paid-in capital	414,633	401,957
Retained earnings	755,572	703,030
Treasury stock, 5,131,676 and 4,906,209 shares at September 30, 2023 and December 31, 2022 respectively	(266,530)	(243,666)
Accumulated other comprehensive loss	(10,369)	(8,133)
Total Stockholders’ Equity	893,330	853,211
Total Liabilities and Stockholders’ Equity	$ 2,055,120	$ 2,092,258

CONSOLIDATED BALANCE SHEETS (_2

CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - $ / shares	Sep. 30, 2023	Dec. 31, 2022
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)	23,948,590	23,771,596
Common stock, outstanding (in shares)	18,816,914	18,883,050
Treasury stock, shares (in shares)	5,131,676	4,906,209

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Revenue	$ 501,519	$ 467,777	$ 1,484,886	$ 1,304,355
Direct costs:
Direct costs	323,504	307,295	961,473	834,358
Operating costs and expenses:
Indirect and selling expenses	131,553	118,290	381,808	350,145
Depreciation and amortization	5,917	5,297	19,052	15,198
Amortization of intangible assets	8,644	8,661	27,154	18,941
Total operating costs and expenses	146,114	132,248	428,014	384,284
Operating income	31,901	28,234	95,399	85,713
Interest, net	(10,557)	(7,420)	(30,146)	(14,096)
Other income	2,736	833	1,501	438
Income before income taxes	24,080	21,647	66,754	72,055
Provision for income taxes	340	2,542	6,304	16,691
Net income	$ 23,740	$ 19,105	$ 60,450	$ 55,364
Earnings per Share:
Basic	$ 1.26	$ 1.01	$ 3.22	$ 2.94
Diluted	$ 1.25	$ 1.01	$ 3.19	$ 2.91
Weighted-average Shares:
Basic	18,815	18,826	18,795	18,806
Diluted	18,974	19,009	18,958	19,001
Cash dividends declared per common share	$ 0.14	$ 0.14	$ 0.42	$ 0.42
Other comprehensive loss, net of tax	$ (4,053)	$ (1,555)	$ (2,236)	$ (3,107)
Comprehensive income, net of tax	$ 19,687	$ 17,550	$ 58,214	$ 52,257

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash Flows from Operating Activities
Net income	$ 60,450	$ 55,364
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	691	91
Deferred income taxes and unrecognized income tax benefits	(3,533)	6,023
Non-cash equity compensation	10,134	10,023
Depreciation and amortization	46,207	34,139
Facilities consolidation reserve		(236)
Amortization of debt issuance costs	984	940
Impairment of long-lived assets	3,801
Gain on divestiture of a business	(4,302)
Other adjustments, net	(2,222)	474
Changes in operating assets and liabilities, net of the effects of acquisitions:
Net contract assets and liabilities	(52,010)	(72,619)
Contract receivables	12,087	(31,770)
Prepaid expenses and other assets	11,893	(11,991)
Operating lease assets and liabilities, net	3,897	(1,305)
Accounts payable	(13,333)	23,394
Accrued salaries and benefits	(8,521)	(13,971)
Accrued subcontractors and other direct costs	(3,353)	9,441
Accrued expenses and other current liabilities	(18,727)	(476)
Income tax receivable and payable	450	(1,667)
Other liabilities	959	742
Net Cash Provided by Operating Activities	45,552	6,596
Cash Flows from Investing Activities
Capital expenditures for property and equipment and capitalized software	(17,876)	(17,323)
Proceeds from working capital adjustments related to prior business acquisition		2,911
Payments for business acquisitions, net of cash acquired	(32,664)	(238,991)
Proceeds from divestiture of a business	47,151
Net Cash Used in Investing Activities	(3,389)	(253,403)
Cash Flows from Financing Activities
Advances from working capital facilities	972,266	1,358,335
Payments on working capital facilities	(995,244)	(1,074,888)
Proceeds from other short-term borrowings	25,394
Repayments of other short-term borrowings	(18,845)
Receipt of restricted contract funds	6,412	13,525
Payment of restricted contract funds	(7,042)	(23,358)
Debt issue costs		(4,852)
Payments of principal portion of finance leases	(1,780)
Proceeds from exercise of options	279	412
Dividends paid	(7,903)	(7,912)
Net payments for stock issuances and buybacks	(20,601)	(21,105)
Payments on business acquisition liabilities		(1,132)
Net Cash (Used in) Provided by Financing Activities	(47,064)	239,025
Effect of Exchange Rate Changes on Cash, Cash Equivalents, and Restricted Cash	(213)	(2,175)
Decrease in Cash, Cash Equivalents, and Restricted Cash	(5,114)	(9,957)
Cash, Cash Equivalents, and Restricted Cash, Beginning of Period	12,968	20,433
Cash, Cash Equivalents, and Restricted Cash, End of Period	7,854	10,476
Supplemental Disclosure of Cash Flow Information
Interest	29,173	13,595
Income taxes	$ 12,604	14,384
Non-cash investing and financing transactions:
Tenant improvements funded by lessor		20,253
Acquisition of property and equipment through finance lease		$ 15,027

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pay vs Performance Disclosure
Net Income (Loss)	$ 23,740	$ 19,105	$ 60,450	$ 55,364

Insider Trading Arrangements

Insider Trading Arrangements	9 Months Ended
	Sep. 30, 2023 shares
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	On August 24, 2023 , John Wasson , our Chair, President and Chief Executive Officer , adopted a trading plan intended to satisfy the affirmative defense conditions under Rule 10b5-1(c) of the Securities Exchange Act of 1934, as amended (the Exchange Act). The plan is for the sale of up to 7,500 shares and terminates on the earlier of the date all the shares under the plan are sold and August 28, 2025 . On August 24, 2023 , James Morgan , our Chief Operating Officer , adopted a trading plan intended to satisfy the affirmative defense conditions under Rule 10b5-1(c) of the Securities Exchange Act of 1934, as amended (the Exchange Act). The plan is for the sale of up to 5,000 shares and terminates on the earlier of the date all the shares under the plan are sold and August 28, 2025 .
John Wasson [Member]
Trading Arrangements, by Individual
Name	John Wasson
Title	Chair, President and Chief Executive Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	August 24, 2023
Termination Date	August 28, 2025
Aggregate Available	7,500
James Morgan [Member]
Trading Arrangements, by Individual
Name	James Morgan
Title	Chief Operating Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	August 24, 2023
Termination Date	August 28, 2025
Aggregate Available	5,000

Basis of Presentation and Natur

Basis of Presentation and Nature of Operations	9 Months Ended
	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Nature of Operations	NOTE 1 – BASIS OF PRESENTATION AND NATURE OF OPERATION S Basis of Presentation The accompanying consolidated financial statements include the accounts of ICF International, Inc. (“ICFI”) and its principal subsidiary, ICF Consulting Group, Inc. (“Consulting,” and together with ICFI, the “Company”), and have been prepared in accordance with United States (“U.S.”) generally accepted accounting principles (“U.S. GAAP”). Consulting is a wholly owned subsidiary of ICFI. ICFI is a holding company with no operations or assets other than its investment in the common stock of Consulting. All other subsidiaries of the Company are wholly owned by Consulting. Material intercompany transactions and balances have been eliminated. Nature of Operations The Company provides professional services and technology-based solutions, including management, marketing, technology, and policy consulting and implementation services, in the areas of energy, environment, infrastructure and disaster recovery; health and social programs; and security and other civilian & commercial. The Company offers a full range of services to clients throughout the entire life cycle of a policy, program, project, or initiative, from research and analysis, 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 customers are U.S. federal government departments and agencies. The Company also serves U.S. state (including territories) and local government departments and agencies, international governments, and commercial clients worldwide. Commercial clients include airlines, airports, electric and gas utilities, health care companies, banks and other financial services companies, transportation, travel and hospitality firms, non-profit associations, manufacturing firms, retail chains, and distribution companies. The terms “federal” or “federal government” refer to the U.S. federal government, and “state and local” or “state and local government” refer to U.S. state (including territories) and local governments, unless otherwise indicated. The Company, incorporated in Delaware, is headquartered in Reston, Virginia. The Company maintains additional offices throughout the world, including more than 50 offices in the U.S. and U.S. territories and more than 20 offices in key markets outside the U.S., including offices in the United Kingdom, Belgium, 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 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, impairment of goodwill and long-lived assets, accrued liabilities, revenue recognition (including estimates of variable considerations in determining the total contract price and allocation of performance obligations), the remaining 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 (the “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 op erating segment and reporting unit. Operating results for the three- and nine-months periods ended September 30, 2023 and 2022 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, 2022 and the notes thereto included in the Company’s Annual Report on Form 10-K, filed with the SEC on March 1, 2023. Recent Accounting Pronouncements Recent Accounting Pronouncements Adopted Reference Rate Reform In March 2020, the Financial Accounting Standards Board issued Accounting Standards Update (“ASU”) 2020-04, Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The standard is intended to provide temporary optional expedients and exceptions to the U.S. GAAP guidance on contract modifications and hedge accounting to ease accounting and 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. Entities can elect to not apply certain modification accounting requirements to contracts affected by reference rate reform if certain criteria are met. Also, entities can elect various optional expedients that would allow them to continue to apply hedge accounting for hedging relationships affected by reference rate reform if certain criteria are met. This guidance was effective beginning on March 12, 2020 and entities may elect to apply the amendments prospectively through December 31, 2022, the sunset date. In December 2022, the FASB issued ASU 2022-06 Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848 which extended the sunset date from December 31, 2022 to December 31, 2024. The Company completed its adoption of the provisions of ASU 2020-04 during the second quarter of 2023 upon amendment of its last interest rate swap from LIBOR-based to SOFR-based pricing. Reclassification Certain immaterial amounts in the consolidated statements of comprehensive income have been reclassified to conform to the current year’s presentation. To be consistent with the current presentation of interest, net, the Company reclassified $ 0.1 million and $ 0.2 million in interest income for the three- and nine-month periods ended September 30, 2022, respectively, from “Other expense” to “Interest, net”.

Restricted Cash

Restricted Cash	9 Months Ended
	Sep. 30, 2023
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 nine months ended September 30, 2023 and 2022: September 30, 2023 September 30, 2022 Beginning Ending Beginning Ending Cash and cash equivalents $ 11,257 $ 5,084 $ 8,254 $ 8,483 Restricted cash 1,711 2,770 12,179 1,993 Total of cash, cash equivalents, and restricted cash shown in the consolidated statements of cash flows $ 12,968 $ 7,854 $ 20,433 $ 10,476

Contract Receivables, Net

Contract Receivables, Net	9 Months Ended
	Sep. 30, 2023
Receivables [Abstract]
Contract Receivables, Net	NOTE 3 – CONTRACT RECEIVABLES, NET Contract receivables, net consisted of the following: September 30, 2023 December 31, 2022 Billed and billable $ 219,783 $ 238,449 Allowance for expected credit losses ( 4,965 ) ( 6,112 ) Contract receivables, net $ 214,818 $ 232,337 On December 23, 2022, the Company entered into a Master Receivables Purchase Agreement (the “MRPA”) with MUFG Bank, Ltd. (“MUFG”) for the sale from time to time of certain eligible billed receivables. The purchase price of each receivable is equal to the net invoice amount minus a specified discount. The receivables are sold without recourse and the Company does not retain any ongoing financial interest in the transferred receivables other than providing servicing activities. The Company accounts for the transfers as sales under ASC 860, Transfers and Servicing, derecognizes the receivables from its consolidated balance sheets at the date of the sale, and includes the cash received from MUFG as part of cash flows from operating activities on its consolidated statement of cash flows. During the three and nine months ended September 30, 2023 , the Company sold $ 93.1 million and $ 159.5 million, respectively, in billed receivables to MUFG that is included in operating cash on the consolidated statements of cash flows. As of September 30, 2023 and December 31, 2022 , the Company had $ 10.4 million and $ 6.2 million, respectively, in cash collections from previously sold invoices to be remitted to MUFG which is included as part of “accrued expenses and other current liabilities” on the consolidated balance sheets.

Goodwill

Goodwill	9 Months Ended
	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	NOTE 4 – GOODWILL The changes in carrying amount of goodwill during the nine months ended September 30, 2023 were as follows: Balance as of December 31, 2022 $ 1,212,898 Add: Goodwill resulting from business combination 21,133 Less: Goodwill resulting from business divestiture ( 15,107 ) Effect of foreign currency translation 402 Balance as of September 30, 2023 $ 1,219,326 See “Note 13 – Acquisition and Divestiture” for the details of the business combination and divestiture resulting in the changes in goodwill.

Leases

Leases	9 Months Ended
	Sep. 30, 2023
Leases [Abstract]
Leases	NOTE 5 – LEASES The Company has operating and finance leases for facilities and equipment which have remaining terms ranging from 1 to 15 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 lease cost resulting from changes in these indices is included within variable lease cost. The Company’s lease cost is recognized on a straight-line basis over the lease term. Lease cost consists of the following: Three Months Ended Nine Months Ended September 30, 2023 September 30, 2022 September 30, 2023 September 30, 2022 Operating lease cost $ 6,324 $ 9,411 $ 19,206 $ 28,349 Finance lease cost - amortization of right-of-use assets 494 105 1,482 105 Finance lease cost - interest 146 21 446 21 Short-term lease cost 162 76 495 353 Variable lease cost 115 59 239 106 Sublease income — ( 26 ) ( 28 ) ( 64 ) Total lease cost $ 7,241 $ 9,646 $ 21,840 $ 28,870 Future minimum lease payments under non-cancellable operating and finance leases as of September 30, 2023 were as follows: Operating Finance September 30, 2024 $ 23,307 $ 2,967 September 30, 2025 27,510 2,967 September 30, 2026 23,221 2,967 September 30, 2027 18,692 2,967 September 30, 2028 15,186 2,967 Thereafter 130,521 3,708 Total future minimum lease payments 238,437 18,543 Less: Interest ( 44,489 ) ( 1,825 ) Total lease liabilities $ 193,948 $ 16,718 Other information related to operating and finance leases for nine months ended September 30, 2023 and 2022 is as follows: 2023 2022 Cash paid for amounts included in the measurement of lease liabilities: Operating cash outflows for operating leases $ 15,488 $ 30,038 Operating cash outflows for finance leases 446 — Financing cash outflows for finance leases 1,780 — Right-of-use assets obtained in exchange for operating lease liabilities $ 10,014 $ 13,434 Property and equipment obtained in exchange for finance lease liabilities $ — $ 15,027 Weighted-average remaining lease term Operating leases 11.6 11.6 Finance leases 6.3 7.1 Weighted-average discount rate Operating leases 3.5 % 3.3 % Finance leases 3.4 % 3.4 % During the quarter ended September 30, 2023, the Company ceased use of two office facilities and recorded an impairment of $ 2.9 million related to operating lease right-of-use asset and leasehold improvement, and accrued other future lease-related expenses of $ 2.2 million. The amounts are included as part of indirect and selling expenses on the Company’s consolidated statements of comprehensive income.

Long-Term Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2023
Debt Disclosure [Abstract]
Long-Term Debt	NOTE 6 – LONG-TERM DEBT At September 30, 2023 and December 31, 2022, long-term debt consisted of: September 30, 2023 December 31, 2022 Average Outstanding Average Outstanding Term Loan $ 277,500 $ 288,750 Delayed-Draw Term Loan 220,000 220,000 Revolving Credit 40,888 52,616 Total before debt issuance costs 6.6 % 538,388 3.3 % 561,366 Unamortized debt issuance costs ( 4,451 ) ( 5,032 ) Total $ 533,937 $ 556,334 A s of September 30, 2023 , the Company had an unused balance of $ 180.0 million under its delayed-draw term loan facility (available through November 6, 2023) and unused borrowing capacity under the $ 600.0 million revolving line of credit of $ 557.5 million under a credit agreement with a group of lenders (the “Credit Facility”). The unused borrowing capacity is inclusive of outstanding letters of credit totaling $ 1.6 million . Considering financial, performance-based limitations under the Credit Facility, available borrowing capacity was $ 465.8 million as of September 30, 2023. The average interest rate on borrowings under the Credit Facility was 6.9 % and 6.6 % for the three- and nine-month periods ended September 30, 2023, respectively, and 3.3 % for the twelve-months period ended December 31, 2022. Inclusive of the impact of floating-to-fixed interest rate swaps (see “Note 8 – Derivative Instruments and Hedging Activities”), the average interest rate was 5.5 % for both the three- and nine-month periods ended September 30, 2023, respectively, and 3.7 % for the twelve-month period ended December 31, 2022. Future scheduled repayments of debt principal are as follows: Payments due by Term Loan Delayed-Draw Term Loan Revolving Credit Total September 30, 2024 $ 15,000 $ 8,250 $ — $ 23,250 September 30, 2025 18,750 13,750 — 32,500 September 30, 2026 22,500 16,500 — 39,000 May 6, 2027 (Maturity) 221,250 181,500 40,888 443,638 Total $ 277,500 $ 220,000 $ 40,888 $ 538,388

Revenue Recognition

Revenue Recognition	9 Months Ended
	Sep. 30, 2023
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 and business factors. Those categories are client markets, client type, and contract mix. Client markets provide insight into the breadth of the Company’s expertise. In classifying revenue by client market, the Company attributes revenue from a client to the market that the Company believes is the client’s primary market. The Company also classifies revenue by the type of entity for which it does business, which is an indicator of the diversity of its client base. The Company attributes revenue generated as a subcontractor to a commercial company as government revenue when the ultimate client is a government agency or department. Disaggregation by contract mix provides insight in terms of the degree of performance risk that the Company has assumed. Fixed-price contracts are considered to provide the highest amount of performance risk as the Company is required to deliver a scope of work or level of effort for a negotiated fixed price. Time-and-materials contracts require the Company to provide skilled employees on contracts for negotiated fixed hourly rates. Since the Company is not required to deliver a scope of work, but merely skilled employees, it considers these contracts to be less risky than a fixed-price agreement. Cost-based contracts are considered to provide the lowest amount of performance risk since the Company is generally reimbursed for all contract costs incurred in performance of contract deliverables with only the amount of incentive or award fees (if applicable) dependent on the achievement of negotiated performance requirements. Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Dollars Percent Dollars Percent Dollars Percent Dollars Percent Client Markets: Energy, environment, infrastructure, and disaster recovery $ 204,802 41 % $ 179,002 38 % $ 596,089 40 % $ 522,698 40 % Health and social programs 210,501 42 % 197,225 42 % 620,198 42 % 511,312 39 % Security and other civilian & commercial 86,216 17 % 91,550 20 % 268,599 18 % 270,345 21 % Total $ 501,519 100 % $ 467,777 100 % $ 1,484,886 100 % $ 1,304,355 100 % Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Dollars Percent Dollars Percent Dollars Percent Dollars Percent Client Type: U.S. federal government $ 279,314 56 % $ 271,609 58 % $ 820,116 55 % $ 715,986 55 % U.S. state and local government 76,393 15 % 64,910 14 % 232,274 16 % 194,778 15 % International government 27,623 5 % 23,046 5 % 74,598 5 % 79,060 6 % Total Government 383,330 76 % 359,565 77 % 1,126,988 76 % 989,824 76 % Commercial 118,189 24 % 108,212 23 % 357,898 24 % 314,531 24 % Total $ 501,519 100 % $ 467,777 100 % $ 1,484,886 100 % $ 1,304,355 100 % Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Dollars Percent Dollars Percent Dollars Percent Dollars Percent Contract Mix: Time-and-materials $ 206,646 41 % $ 188,772 40 % $ 615,859 41 % $ 523,661 40 % Fixed-price 223,173 45 % 210,919 45 % 667,711 45 % 580,836 45 % Cost-based 71,700 14 % 68,086 15 % 201,316 14 % 199,858 15 % Total $ 501,519 100 % $ 467,777 100 % $ 1,484,886 100 % $ 1,304,355 100 % 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 following table summarizes the contract balances as of September 30, 2023 and December 31, 2022: September 30, 2023 December 31, 2022 Contract assets $ 209,267 $ 169,088 Contract liabilities ( 16,989 ) ( 25,773 ) Net contract assets (liabilities) $ 192,278 $ 143,315 The net contract assets (liabilities) as of September 30, 2023 increased by $ 49.0 million as compared to December 31, 2022. The increase in net contract assets (liabilities) is primarily due to the timing difference between the performance of services and billings to and payments from customers. There were no material changes to contract balances due to impairments or credit losses during the period. During the nine months ended September 30, 2023 and 2022, the Company recognized $ 17.3 million and $ 27.1 million in revenue related to the contract liabilities balance at December 31, 2022 and 2021, respectively. Performance Obligations The Company had $ 1.5 billion in unfulfilled performance obligations as of September 30, 2023 which primarily reflects the future delivery of services for which revenue will be recognized over time. The obligations relate to continued or additional services required on contracts, including those that are either non-cancellable or have substantive termination penalties, and were generally valued using an estimated cost-plus margin approach, with variable consideration being estimated at the most likely amount. The amounts exclude marketing offers, which are negotiated but unexercised contract options and indefinite delivery/indefinite quantity (IDIQ) and similar arrangements that provided a framework for customers to issue specific tasks, delivery, or purchase orders in the future. The Company expects to satisfy these performance obligations in approximately two years .

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	9 Months Ended
	Sep. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities	NOTE 8 – DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES The Company uses interest rate swap agreements (the “Swaps”) to manage its interest rate risk associated with its borrowings under the Credit Facility. Notwithstanding the terms of the swaps, the Company is ultimately obligated for all amounts due and payable under the Credit Facility. The derivative instruments are recorded on the consolidated balance sheets at fair value. Unrealized gains and losses on derivatives designated as cash flow hedges are reported in other comprehensive income (loss) and reclassified to earnings in a manner that matches the timing of the earnings impact of the hedged transactions. Management intends that the Swaps remain effective and, on a quarterly basis, evaluates them to determine their effectiveness or ineffectiveness and records the change in fair value as an adjustment to other comprehensive income or loss. The Company does not use derivative instruments for speculative or trading purposes. During the s econd quarter of 2023, the Company entered into new floating-to-fixed interest rate swaps for a total notional amount of $ 100.0 million that will mature on June 27, 2028 . At September 30, 2023 , the Company had floating-to-fixed interest rate swaps for an aggregate notional amount of $ 275.0 million, of which $ 100.0 million will mature on February 28, 2025 , $ 75.0 million will mature on February 28, 2028 , and $ 100.0 million will mature on June 27, 2028 . The Company has designated the Swaps as cash flow hedges.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Income Taxes	NOTE 9 – INCOME TAXES 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 2019 through 2021 t ax 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 statutes of limitations and, as such, are subject to examination for the tax years from 2018 to 2021 . The Company’s effective tax rate for the three months ended September 30, 2023 and 2022 was 1.4 % and 11.7 % , respectively, and 9.4 % and 23.2 % for the nine months ended September 30, 2023 and 2022, respectively. A reconciliation of the Company’s statutory rate to the effective tax rate for the three and nine months ended September 30, 2023 and 2022 is as follows: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Taxes at statutory rate 21.0 % 21.0 % 21.0 % 21.0 % State taxes, net of federal benefit 5.8 % 5.6 % 5.8 % 5.6 % Executive compensation 1.4 % 1.5 % 1.4 % 1.5 % Corporate-owned life insurance ( 0.2 %) 1.1 % ( 0.2 %) 1.1 % Other permanent differences 0.4 % 1.0 % 0.3 % 0.7 % Prior year tax adjustments ( 27.1 %) 0.3 % ( 10.8 %) ( 0.3 %) Uncertain tax position 19.1 % — 6.9 % — Worthless stock ( 20.2 %) ( 17.7 %) ( 7.3 %) ( 5.5 %) Capital loss — — ( 6.7 %) — Valuation allowance 3.1 % 0.7 % 1.9 % 1.0 % Equity-based compensation ( 0.6 %) ( 1.3 %) ( 1.6 %) ( 1.4 %) Tax credits ( 1.3 %) ( 0.5 %) ( 1.3 %) ( 0.5 %) Taxes at effective rate 1.4 % 11.7 % 9.4 % 23.2 % The Company restructured the ownership of its Canadian entities for tax purposes during the second quarter of 2023, resulting in a 6.7 % decrease in the Company’s effective income tax rate for the nine months ended 2023 compared to 2022. The Company liquidated one of its UK subsidiaries as part of the winddown of its commercial marketing business during the third quarter of 2023, resulting in a reduction in the Company’s effective income tax rate of 20.2 % and 7.3 % for the three and nine months ended September 30, 2023, respectively. On December 20, 2017, the U.S. Congress passed the Tax Cuts and Job Act of 2017 (the “TCJA”) which was signed into law on December 22, 2017 and was generally effective beginning January 1, 2018. The TCJA changed the provision for deduction of allowable research and development costs under the IRC. Effective for tax years beginning after January 1, 2022, research and development costs are required to be capitalized and amortized over a period of five years for domestic and fifteen years for foreign research and development for income tax purposes. As a result of the capitalization, the Company recognized an increase of $ 9.9 million in deferred tax asset for both the three and nine months ended September 30, 2023, respectively. During the third quarter ended September 30, 2023, the Company recorded return-to-provision adjustments in connection with the filing of its 2022 U.S. federal tax return. The adjustments were primarily driven by increase in tax credits associated with qualifying research activities. As of September 30, 2023 and December 31, 2022, the Company’s unrecognized tax benefits and the related accrued interest totaled $ 26.8 million and $ 0.2 million, respectively, which include $ 4.7 million and $ 0.1 million, respectively, of tax positions that, if recognized, would impact the effective rate. The unrecognized tax benefits and the related accrued interest are included as part of other long-term liabilities on the Company’s consolidated balance sheets. The components and a reconciliation of unrecognized tax benefits are as follows: September 30, 2023 December 31, 2022 Transfer pricing $ 145 $ 145 Section 41 tax credit 4,595 — Section 174 expense capitalization 21,416 — Total unrecognized tax benefits liabilities $ 26,156 $ 145 Unrecognized tax benefits at January 1, 2022 $ 450 Decrease attributable to tax positions taken during the prior period ( 305 ) Unrecognized tax benefits at December 31, 2022 145 Increase attributable to tax positions taken during the current period 26,011 Unrecognized tax benefits at September 30, 2023 $ 26,156

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	9 Months Ended
	Sep. 30, 2023
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 September 30, 2023 and 2022 included the following: Three Months Ended September 30, 2023 Foreign Change in (2) Total Accumulated other comprehensive (loss) income at June 30, 2023 $ ( 10,833 ) $ 4,517 $ ( 6,316 ) Current period other comprehensive (loss) income: Other comprehensive (loss) income before reclassifications ( 3,487 ) 4,379 892 Amounts reclassified from accumulated other comprehensive (loss) income (3) — ( 2,101 ) ( 2,101 ) Effect of taxes ( 2,227 ) ( 617 ) ( 2,844 ) Total current period other comprehensive (loss) income ( 5,714 ) 1,661 ( 4,053 ) Accumulated other comprehensive (loss) income at September 30, 2023 $ ( 16,547 ) $ 6,178 $ ( 10,369 ) Three Months Ended September 30, 2022 Foreign Gain on Sale (1) Change in (2) Total Accumulated other comprehensive (loss) income at June 30, 2022 $ ( 16,562 ) $ 305 $ 3,670 $ ( 12,587 ) Current period other comprehensive (loss) income: Other comprehensive (loss) income before reclassifications ( 7,074 ) — 3,128 ( 3,946 ) Amounts reclassified from accumulated other comprehensive (loss) income (3) — ( 180 ) 142 ( 38 ) Effect of taxes 3,309 48 ( 928 ) 2,429 Total current period other comprehensive (loss) income ( 3,765 ) ( 132 ) 2,342 ( 1,555 ) Accumulated other comprehensive (loss) income at September 30, 2022 $ ( 20,327 ) $ 173 $ 6,012 $ ( 14,142 ) Nine Months Ended September 30, 2023 Foreign Gain on Sale (1) Change in (2) Total Accumulated other comprehensive (loss) income at December 31, 2022 $ ( 14,056 ) $ 41 $ 5,882 $ ( 8,133 ) Current period other comprehensive (loss) income: Other comprehensive (loss) income before reclassifications ( 82 ) — 5,658 5,576 Amounts reclassified from accumulated other comprehensive (loss) income (3) — ( 60 ) ( 5,239 ) ( 5,299 ) Effect of taxes ( 2,409 ) 19 ( 123 ) ( 2,513 ) Total current period other comprehensive (loss) income ( 2,491 ) ( 41 ) 296 ( 2,236 ) Accumulated other comprehensive (loss) income at September 30, 2023 $ ( 16,547 ) $ — $ 6,178 $ ( 10,369 ) Nine Months Ended September 30, 2022 Foreign Gain on Sale (1) Change in (2) Total Accumulated other comprehensive (loss) income at December 31, 2021 $ ( 8,759 ) $ 569 $ ( 2,845 ) $ ( 11,035 ) Current period other comprehensive (loss) income: Other comprehensive (loss) income before reclassifications ( 16,099 ) — 10,430 ( 5,669 ) Amounts reclassified from accumulated other comprehensive (loss) income (3) — ( 540 ) 1,640 1,100 Effect of taxes 4,531 144 ( 3,213 ) 1,462 Total current period other comprehensive (loss) income ( 11,568 ) ( 396 ) 8,857 ( 3,107 ) Accumulated other comprehensive (loss) income at September 30, 2022 $ ( 20,327 ) $ 173 $ 6,012 $ ( 14,142 ) (1) Represents the unamortized value of an interest rate hedge agreement, designated as a cash flow hedge, which was sold on December 1, 2016. The fair value of the interest rate hedge agreement, at the date of the sale, was recorded in other comprehensive income, net of tax, and is being reclassified to interest expense when earnings are impacted by the hedged items and as interest payments are made on the Credit Facility from January 31, 2018 to January 31, 2023. (2) Represents the change in fair value of interest rate hedge agreements designated as cash flow hedges. The fair value of the interest rate hedge agreements was recorded in other comprehensive income, net of tax, and will be reclassified to earnings when earnings are impacted by the hedged items, as interest payments are made on the Credit Facility from August 31, 2018 to June 27, 2028 (see “Note 8 – Derivative Instruments and Hedging Activities”). (3) The Company expects to reclassify $ 6.5 million of gains related to the Change in Fair Value of Interest Rate Hedge Agreement from accumulated other comprehensive loss into earnings during the next 12 months.

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2023
Stockholders' Equity Note [Abstract]
Stockholders' Equity	NOTE 11 – STOCKHOLDERS’ EQUITY Changes in stockholders’ equity for the three and nine months ended September 30, 2023 and 2022 are as follows: Three Months Ended September 30, 2023 Common Stock Additional Retained Treasury Stock Accumulated Shares Amount Capital Earnings Shares Amount Loss Total Balance at June 30, 2023 18,815 24 411,187 734,468 5,131 ( 266,518 ) ( 6,316 ) $ 872,845 Net income — — — 23,740 — — — 23,740 Other comprehensive income — — — — — — ( 4,053 ) ( 4,053 ) Equity compensation — — 3,446 — — — — 3,446 Issuance of shares pursuant to employee stock purchase plan and vesting of restricted stock units 2 — — — — — — — Payments for stock buybacks — — — — — ( 12 ) — ( 12 ) Dividends declared — — — ( 2,636 ) — — — ( 2,636 ) Balance at September 30, 2023 18,817 $ 24 $ 414,633 $ 755,572 5,131 $ ( 266,530 ) $ ( 10,369 ) $ 893,330 Three Months Ended September 30, 2022 Common Stock Additional Retained Treasury Stock Accumulated Shares Amount Capital Earnings Shares Amount Loss Total Balance at June 30, 2022 18,818 $ 23 $ 393,224 $ 680,323 4,887 $ ( 241,566 ) $ ( 12,587 ) $ 819,417 Net income — — — 19,105 — — — 19,105 Other comprehensive loss — — — — — — ( 1,555 ) ( 1,555 ) Equity compensation — — 3,516 — — — — 3,516 Exercise of stock options 5 — 218 — — — — 218 Issuance of shares pursuant to employee stock purchase plan and vesting of restricted stock units 14 — 4 — — — — 4 Payments for stock buybacks ( 3 ) — — — 3 ( 330 ) — ( 330 ) Dividends declared — — — ( 2,636 ) — — — ( 2,636 ) Balance at September 30, 2022 18,834 $ 23 $ 396,962 $ 696,792 4,890 $ ( 241,896 ) $ ( 14,142 ) $ 837,739 Nine Months Ended September 30, 2023 Common Stock Additional Retained Treasury Stock Accumulated Shares Amount Capital Earnings Shares Amount Loss Total Balance at December 31, 2022 18,883 $ 23 $ 401,957 $ 703,030 4,906 $ ( 243,666 ) $ ( 8,133 ) $ 853,211 Net income — — — 60,450 — — — 60,450 Other comprehensive income — — — — — — ( 2,236 ) ( 2,236 ) Equity compensation — — 10,134 — — — — 10,134 Exercise of stock options 8 — 278 — — — — 278 Issuance of shares pursuant to employee stock purchase plan and vesting of restricted stock units 151 1 2,264 — — — — 2,265 Payments for stock buybacks ( 225 ) — — — 225 ( 22,864 ) — ( 22,864 ) Dividends declared — — — ( 7,908 ) — — — ( 7,908 ) Balance at September 30, 2023 18,817 $ 24 $ 414,633 $ 755,572 5,131 $ ( 266,530 ) $ ( 10,369 ) $ 893,330 Nine Months Ended September 30, 2022 Common Stock Additional Retained Treasury Stock Accumulated Shares Amount Capital Earnings Shares Amount Loss Total Balance at December 31, 2021 18,876 $ 23 $ 384,984 $ 649,298 4,659 $ ( 219,800 ) $ ( 11,035 ) $ 803,470 Net income — — — 55,364 — — — 55,364 Other comprehensive loss — — — — — — ( 3,107 ) ( 3,107 ) Equity compensation — — 10,023 — — — — 10,023 Exercise of stock options 13 — 412 — — — — 412 Issuance of shares pursuant to employee stock purchase plan and vesting of restricted stock units 176 — 1,543 — — — — 1,543 Payments for stock buybacks ( 231 ) — — — 231 ( 22,096 ) — ( 22,096 ) Dividends declared — — — ( 7,870 ) — — — ( 7,870 ) Balance at September 30, 2022 18,834 $ 23 $ 396,962 $ 696,792 4,890 $ ( 241,896 ) $ ( 14,142 ) $ 837,739

Stock-based Compensation

Stock-based Compensation	9 Months Ended
	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Stock-based Compensation	NOTE 12 – STOCK-BASED COMPENSATION On April 4, 2018, the Company’s board of directors (the “board”) approved the 2018 Omnibus Incentive Plan (the “2018 Omnibus Plan”), which was subsequently approved by the Company’s 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. On June 1, 2023, the Company’s stockholders approved an amendment and restatement of the 2018 Omnibus Plan (the “2018 A&R Omnibus Plan”) which further increased the number of shares available for issuance, incorporated compensation recovery provisions consistent with new SEC and NASDAQ requirements, and made certain other clarifying changes. The A&R 2018 Omnibus Plan, as amended, allows the Company to grant 2,050,000 shares using stock options, stock appreciation rights, restricted stock, restricted stock units (“RSUs”), performance units and performance share awards (“PSAs”), cash-settled restricted stock units (“CSRSUs”), 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 2,631 as of September 30, 2023 , 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 September 30, 2023, the Company had approximately 1,131,012 shares available for grant under the 2018 A&R 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. 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 2023 have a performance period from January 1, 2023 through December 31, 2025 and performance conditions that are consistent with the PSAs granted in prior years. The following awards were granted during the three and nine months ended September 30, 2023 and 2022: Awards Granted Average Grant Date Fair Value Three Months Ended Nine Months Ended Three Months Ended Nine Months Ended September 30, September 30, September 30, September 30, 2023 2022 2023 2022 2023 2022 2023 2022 Employee Stock Awards — 25,059 113,569 177,960 $ — $ 99.47 $ 107.29 $ 92.87 Cash-Settled Restricted Stock Units 2,281 15,694 68,745 78,534 $ 130.47 $ 99.47 $ 110.04 $ 93.81 Non-Employee Director Stock Awards 8,211 10,703 8,211 11,399 $ 127.81 $ 94.79 $ 127.81 $ 95.35 Total 10,492 51,456 190,525 267,893 The total stock-based compensation expense for the three and nine months ended September 30, 2023 and 2022, and the unrecognized compensation expense at September 30, 2023: Three Months Ended Nine Months Ended September 30, September 30, As of September 30, 2023 (in millions) 2023 2022 2023 2022 Unrecognized Weighted Average Period to Recognize (in years) Employee Stock Awards $ 3,166 $ 3,241 $ 9,394 $ 9,215 $ 19,213 1.65 Cash-Settled Restricted Stock Units 1,709 1,793 5,808 4,242 12,134 1.94 Non-Employee Director Stock Awards 280 276 740 808 770 0.67 Total $ 5,155 $ 5,310 $ 15,942 $ 14,265 $ 32,117

Acquisition and Divestiture

Acquisition and Divestiture	9 Months Ended
	Sep. 30, 2023
Business Combinations [Abstract]
Acquisition and Divestiture	NOTE 13 – ACQUISITION AND DIVESTITURE Acquisition CMY Solutions, LLC. On May 1, 2023 , the Company acquired CMY Solutions, LLC. (“CMY”), a privately-held company that provides engineering and automation solutions to utilities and organizations, for $ 32.6 million in cash. The acquisition enhances the Company’s offerings in the field of power and energy advisory services. As part of the allocation of purchase consideration, the Company recorded $ 10.3 million of intangible assets, $ 1.2 million in net working capital, and $ 21.1 million of goodwill. Intangible assets consist of $ 10.2 million related to existing customer relationships and $ 0.1 million related to trade names and trademarks. The acquisition of CMY is not material to the Company’s results of operations. Divestiture Commercial Marketing On July 21, 2023, the Company entered into an Asset Purchase Agreement (the “APA”) to sell its U.S. commercial marketing business, including certain assets of the business, for initial cash considerations of $ 49.5 million before final net working capital adjustments. On September 12, 2023 , the Company completed the divesture and received $ 47.1 in cash, net of working capital adjustments and certain amounts held in escrow. The disposal of the commercial marketing business was not a major strategic shift that was, or will be, significant to the Company’s operations and financial results. In connection with the sale, the Company recorded a gross gain of $ 4.3 million and transactions fees of $ 1.9 million, for a total pre-tax gain of $ 2.4 million, that is included as part of other income on the Company’s consolidated statements of comprehensive income.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2023
Earnings Per Share [Abstract]
Earnings Per Share	NOTE 14 – EARNINGS PER SHARE The Company’s earnings per share (“EPS”) is computed by dividing reported net income by the weighted-average number of shares outstanding. Diluted EPS considers the potential dilution that could occur if common stock equivalents of stock options, RSUs, and PSAs were exercised or converted into stock. PSAs are included in the computation of diluted shares only to the extent that the underlying performance conditions: (i) are satisfied as of the end of the reporting period or (ii) would be considered satisfied if the end of the reporting period were the end of the related performance period and the result would be dilutive under the treasury stock method. As of September 30, 2023, the PSAs granted during the year ended December 31, 2021 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, 2022 and during the nine months ended September 30, 2023 have not yet completed their initial two-year performance period and therefore were excluded in the calculation of diluted EPS. The dilutive effect of stock options, RSUs, and PSAs for each period reported is summarized below: Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Net Income $ 23,740 $ 19,105 $ 60,450 $ 55,364 Weighted-average number of basic shares outstanding during the period 18,815 18,826 18,795 18,806 Dilutive effect of stock options, RSUs, and performance shares 159 183 163 195 Weighted-average number of diluted shares outstanding during the period 18,974 19,009 18,958 19,001 Basic earnings per share $ 1.26 $ 1.01 $ 3.22 $ 2.94 Diluted earnings per share $ 1.25 $ 1.01 $ 3.19 $ 2.91

Share Repurchase Program

Share Repurchase Program	9 Months Ended
	Sep. 30, 2023
Equity [Abstract]
Share Repurchase Program	NOTE 15 – SHARE REPURCHASE PROGRAM In September 2017, the board approved a share repurchase program that allows for share repurchases in the aggregate up to $ 100.0 million under approved share repurchase plans pursuant to Rules 10b5-1 and 10b-18 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). In November 2021, the board amended and increased the previously authorized aggregate repurchase limit from $ 100.0 million to $ 200.0 million. The Credit Facility permits share repurchases provided that the Company’s Consolidated Leverage Ratio, prior to and after giving effect to such repurchases, is 0.50 to 1.00 less than the then-applicable maximum Consolidated Leverage Ratio and subject to the Company having net liquidity of at least $ 100.0 million after giving effect to such repurchases. Notwithstanding the formula-based limit, the Company is permitted to make share repurchases up to $ 25.0 million per calendar year provided that it was not in default. Purchases under this program may be made from time to time at prevailing market prices in the open market or in privately negotiated transactions pursuant to Rule 10b-18 under the Exchange Act and in accordance with applicable insider trading and other securities laws and regulations. The purchases are funded from existing cash balances and/or borrowings, and the repurchased shares are held in treasury. The timing and extent to which the Company repurchases its shares will depend on market conditions and other corporate considerations in the Company’s sole discretion. For the nine months ended September 30, 2023 and 2022, the Company used $ 18.1 million to repurchase 180,000 shares and $ 17.0 million to repurchase 176,375 shares, respectively, under the share repurchase program. As of September 30, 2023, $ 93.7 million of authorization remained available for share repurchases under the repurchase program.

Fair Value

Fair Value	9 Months Ended
	Sep. 30, 2023
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: September 30, 2023 (in thousands) Level 1 Level 2 Level 3 Total Location on Balance Sheet Assets: Interest rate swaps - current portion $ — $ 6,450 $ — $ 6,450 Prepaid expenses and other assets Foreign currency forward and swap contracts — 38 — 38 Prepaid expenses and other assets Interest rate swaps - long-term portion — 2,340 — 2,340 Other assets Company-owned life insurance policies — 18,705 — 18,705 Other assets Liabilities: Interest rate swaps - long-term portion $ — $ 370 $ — $ 370 Other long-term liabilities December 31, 2022 (in thousands) Level 1 Level 2 Level 3 Total Location on Balance Sheet Assets: Interest rate swaps - current portion $ — $ 5,051 $ — $ 5,051 Prepaid expenses and other assets Interest rate swaps - long-term portion — 2,950 — 2,950 Other assets Company-owned life insurance policies — 17,869 — 17,869 Other assets

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE 17 – COMMITMENTS AND CONTINGENCIES Letters of Credit At September 30, 2023 and December 31, 2022, the Company had open standby letters of credit totaling $ 1.6 million and $ 2.0 million, respectively. The open standby letters of credit reduce the Company’s unused borrowing capacity under the Credit Facility. 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.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2023
Subsequent Events [Abstract]
Subsequent Events	NOTE 18 – SUBSEQUENT EVENTS Dividend On November 2, 2023, the board approved a $ 0.14 per share cash dividend. The dividend will be paid on January 12, 2024 to shareholders of record as of the close of business on December 8, 2023.

Basis of Presentation and Nat_2

Basis of Presentation and Nature of Operations (Policies)	9 Months Ended
	Sep. 30, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying consolidated financial statements include the accounts of ICF International, Inc. (“ICFI”) and its principal subsidiary, ICF Consulting Group, Inc. (“Consulting,” and together with ICFI, the “Company”), and have been prepared in accordance with United States (“U.S.”) generally accepted accounting principles (“U.S. GAAP”). Consulting is a wholly owned subsidiary of ICFI. ICFI is a holding company with no operations or assets other than its investment in the common stock of Consulting. All other subsidiaries of the Company are wholly owned by Consulting. Material intercompany transactions and balances have been eliminated.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent liabilities at the date of the consolidated financial statements, and the reported amounts of revenue and expenses during the reporting periods. Areas of the consolidated financial statements where estimates may have the most significant effect include contractual and regulatory reserves, valuation and lives of tangible and intangible assets, impairment of goodwill and long-lived assets, accrued liabilities, revenue recognition (including estimates of variable considerations in determining the total contract price and allocation of performance obligations), the remaining 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.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Recent Accounting Pronouncements Adopted Reference Rate Reform In March 2020, the Financial Accounting Standards Board issued Accounting Standards Update (“ASU”) 2020-04, Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The standard is intended to provide temporary optional expedients and exceptions to the U.S. GAAP guidance on contract modifications and hedge accounting to ease accounting and 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. Entities can elect to not apply certain modification accounting requirements to contracts affected by reference rate reform if certain criteria are met. Also, entities can elect various optional expedients that would allow them to continue to apply hedge accounting for hedging relationships affected by reference rate reform if certain criteria are met. This guidance was effective beginning on March 12, 2020 and entities may elect to apply the amendments prospectively through December 31, 2022, the sunset date. In December 2022, the FASB issued ASU 2022-06 Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848 which extended the sunset date from December 31, 2022 to December 31, 2024. The Company completed its adoption of the provisions of ASU 2020-04 during the second quarter of 2023 upon amendment of its last interest rate swap from LIBOR-based to SOFR-based pricing.
Reclassification	Reclassification Certain immaterial amounts in the consolidated statements of comprehensive income have been reclassified to conform to the current year’s presentation. To be consistent with the current presentation of interest, net, the Company reclassified $ 0.1 million and $ 0.2 million in interest income for the three- and nine-month periods ended September 30, 2022, respectively, from “Other expense” to “Interest, net”.

Restricted Cash (Tables)

Restricted Cash (Tables)	9 Months Ended
	Sep. 30, 2023
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 nine months ended September 30, 2023 and 2022: September 30, 2023 September 30, 2022 Beginning Ending Beginning Ending Cash and cash equivalents $ 11,257 $ 5,084 $ 8,254 $ 8,483 Restricted cash 1,711 2,770 12,179 1,993 Total of cash, cash equivalents, and restricted cash shown in the consolidated statements of cash flows $ 12,968 $ 7,854 $ 20,433 $ 10,476

Contract Receivables, Net (Tabl

Contract Receivables, Net (Tables)	9 Months Ended
	Sep. 30, 2023
Receivables [Abstract]
Summary of Contract Receivables, Net	Contract receivables, net consisted of the following: September 30, 2023 December 31, 2022 Billed and billable $ 219,783 $ 238,449 Allowance for expected credit losses ( 4,965 ) ( 6,112 ) Contract receivables, net $ 214,818 $ 232,337

Goodwill (Tables)

Goodwill (Tables)	9 Months Ended
	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Changes in Carrying Amount of Goodwill	The changes in carrying amount of goodwill during the nine months ended September 30, 2023 were as follows: Balance as of December 31, 2022 $ 1,212,898 Add: Goodwill resulting from business combination 21,133 Less: Goodwill resulting from business divestiture ( 15,107 ) Effect of foreign currency translation 402 Balance as of September 30, 2023 $ 1,219,326

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2023
Leases [Abstract]
Summary of Lease Cost	The Company’s lease cost is recognized on a straight-line basis over the lease term. Lease cost consists of the following: Three Months Ended Nine Months Ended September 30, 2023 September 30, 2022 September 30, 2023 September 30, 2022 Operating lease cost $ 6,324 $ 9,411 $ 19,206 $ 28,349 Finance lease cost - amortization of right-of-use assets 494 105 1,482 105 Finance lease cost - interest 146 21 446 21 Short-term lease cost 162 76 495 353 Variable lease cost 115 59 239 106 Sublease income — ( 26 ) ( 28 ) ( 64 ) Total lease cost $ 7,241 $ 9,646 $ 21,840 $ 28,870
Summary of Future Minimum Lease Payments Under Non-Cancellable Operating and Finance Leases	Future minimum lease payments under non-cancellable operating and finance leases as of September 30, 2023 were as follows: Operating Finance September 30, 2024 $ 23,307 $ 2,967 September 30, 2025 27,510 2,967 September 30, 2026 23,221 2,967 September 30, 2027 18,692 2,967 September 30, 2028 15,186 2,967 Thereafter 130,521 3,708 Total future minimum lease payments 238,437 18,543 Less: Interest ( 44,489 ) ( 1,825 ) Total lease liabilities $ 193,948 $ 16,718
Summary of Other Information Related to Operating and Finance Leases	Other information related to operating and finance leases for nine months ended September 30, 2023 and 2022 is as follows: 2023 2022 Cash paid for amounts included in the measurement of lease liabilities: Operating cash outflows for operating leases $ 15,488 $ 30,038 Operating cash outflows for finance leases 446 — Financing cash outflows for finance leases 1,780 — Right-of-use assets obtained in exchange for operating lease liabilities $ 10,014 $ 13,434 Property and equipment obtained in exchange for finance lease liabilities $ — $ 15,027 Weighted-average remaining lease term Operating leases 11.6 11.6 Finance leases 6.3 7.1 Weighted-average discount rate Operating leases 3.5 % 3.3 % Finance leases 3.4 % 3.4 %

Long-Term Debt (Tables)

Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2023
Debt Disclosure [Abstract]
Schedule of Long-term Debt	At September 30, 2023 and December 31, 2022, long-term debt consisted of: September 30, 2023 December 31, 2022 Average Outstanding Average Outstanding Term Loan $ 277,500 $ 288,750 Delayed-Draw Term Loan 220,000 220,000 Revolving Credit 40,888 52,616 Total before debt issuance costs 6.6 % 538,388 3.3 % 561,366 Unamortized debt issuance costs ( 4,451 ) ( 5,032 ) Total $ 533,937 $ 556,334 A
Schedule of Future Scheduled Repayments of Debt Principal	Future scheduled repayments of debt principal are as follows: Payments due by Term Loan Delayed-Draw Term Loan Revolving Credit Total September 30, 2024 $ 15,000 $ 8,250 $ — $ 23,250 September 30, 2025 18,750 13,750 — 32,500 September 30, 2026 22,500 16,500 — 39,000 May 6, 2027 (Maturity) 221,250 181,500 40,888 443,638 Total $ 277,500 $ 220,000 $ 40,888 $ 538,388

Revenue Recognition (Tables)

Revenue Recognition (Tables)	9 Months Ended
	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Dollars Percent Dollars Percent Dollars Percent Dollars Percent Client Markets: Energy, environment, infrastructure, and disaster recovery $ 204,802 41 % $ 179,002 38 % $ 596,089 40 % $ 522,698 40 % Health and social programs 210,501 42 % 197,225 42 % 620,198 42 % 511,312 39 % Security and other civilian & commercial 86,216 17 % 91,550 20 % 268,599 18 % 270,345 21 % Total $ 501,519 100 % $ 467,777 100 % $ 1,484,886 100 % $ 1,304,355 100 % Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Dollars Percent Dollars Percent Dollars Percent Dollars Percent Client Type: U.S. federal government $ 279,314 56 % $ 271,609 58 % $ 820,116 55 % $ 715,986 55 % U.S. state and local government 76,393 15 % 64,910 14 % 232,274 16 % 194,778 15 % International government 27,623 5 % 23,046 5 % 74,598 5 % 79,060 6 % Total Government 383,330 76 % 359,565 77 % 1,126,988 76 % 989,824 76 % Commercial 118,189 24 % 108,212 23 % 357,898 24 % 314,531 24 % Total $ 501,519 100 % $ 467,777 100 % $ 1,484,886 100 % $ 1,304,355 100 % Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Dollars Percent Dollars Percent Dollars Percent Dollars Percent Contract Mix: Time-and-materials $ 206,646 41 % $ 188,772 40 % $ 615,859 41 % $ 523,661 40 % Fixed-price 223,173 45 % 210,919 45 % 667,711 45 % 580,836 45 % Cost-based 71,700 14 % 68,086 15 % 201,316 14 % 199,858 15 % Total $ 501,519 100 % $ 467,777 100 % $ 1,484,886 100 % $ 1,304,355 100 %
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 following table summarizes the contract balances as of September 30, 2023 and December 31, 2022: September 30, 2023 December 31, 2022 Contract assets $ 209,267 $ 169,088 Contract liabilities ( 16,989 ) ( 25,773 ) Net contract assets (liabilities) $ 192,278 $ 143,315

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation	A reconciliation of the Company’s statutory rate to the effective tax rate for the three and nine months ended September 30, 2023 and 2022 is as follows: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Taxes at statutory rate 21.0 % 21.0 % 21.0 % 21.0 % State taxes, net of federal benefit 5.8 % 5.6 % 5.8 % 5.6 % Executive compensation 1.4 % 1.5 % 1.4 % 1.5 % Corporate-owned life insurance ( 0.2 %) 1.1 % ( 0.2 %) 1.1 % Other permanent differences 0.4 % 1.0 % 0.3 % 0.7 % Prior year tax adjustments ( 27.1 %) 0.3 % ( 10.8 %) ( 0.3 %) Uncertain tax position 19.1 % — 6.9 % — Worthless stock ( 20.2 %) ( 17.7 %) ( 7.3 %) ( 5.5 %) Capital loss — — ( 6.7 %) — Valuation allowance 3.1 % 0.7 % 1.9 % 1.0 % Equity-based compensation ( 0.6 %) ( 1.3 %) ( 1.6 %) ( 1.4 %) Tax credits ( 1.3 %) ( 0.5 %) ( 1.3 %) ( 0.5 %) Taxes at effective rate 1.4 % 11.7 % 9.4 % 23.2 %
Components and Reconciliation of Unrecognized Tax Benefits	The components and a reconciliation of unrecognized tax benefits are as follows: September 30, 2023 December 31, 2022 Transfer pricing $ 145 $ 145 Section 41 tax credit 4,595 — Section 174 expense capitalization 21,416 — Total unrecognized tax benefits liabilities $ 26,156 $ 145 Unrecognized tax benefits at January 1, 2022 $ 450 Decrease attributable to tax positions taken during the prior period ( 305 ) Unrecognized tax benefits at December 31, 2022 145 Increase attributable to tax positions taken during the current period 26,011 Unrecognized tax benefits at September 30, 2023 $ 26,156

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
	Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Components of Accumulated Other Comprehensive Loss	Accumulated other comprehensive loss as of September 30, 2023 and 2022 included the following: Three Months Ended September 30, 2023 Foreign Change in (2) Total Accumulated other comprehensive (loss) income at June 30, 2023 $ ( 10,833 ) $ 4,517 $ ( 6,316 ) Current period other comprehensive (loss) income: Other comprehensive (loss) income before reclassifications ( 3,487 ) 4,379 892 Amounts reclassified from accumulated other comprehensive (loss) income (3) — ( 2,101 ) ( 2,101 ) Effect of taxes ( 2,227 ) ( 617 ) ( 2,844 ) Total current period other comprehensive (loss) income ( 5,714 ) 1,661 ( 4,053 ) Accumulated other comprehensive (loss) income at September 30, 2023 $ ( 16,547 ) $ 6,178 $ ( 10,369 ) Three Months Ended September 30, 2022 Foreign Gain on Sale (1) Change in (2) Total Accumulated other comprehensive (loss) income at June 30, 2022 $ ( 16,562 ) $ 305 $ 3,670 $ ( 12,587 ) Current period other comprehensive (loss) income: Other comprehensive (loss) income before reclassifications ( 7,074 ) — 3,128 ( 3,946 ) Amounts reclassified from accumulated other comprehensive (loss) income (3) — ( 180 ) 142 ( 38 ) Effect of taxes 3,309 48 ( 928 ) 2,429 Total current period other comprehensive (loss) income ( 3,765 ) ( 132 ) 2,342 ( 1,555 ) Accumulated other comprehensive (loss) income at September 30, 2022 $ ( 20,327 ) $ 173 $ 6,012 $ ( 14,142 ) Nine Months Ended September 30, 2023 Foreign Gain on Sale (1) Change in (2) Total Accumulated other comprehensive (loss) income at December 31, 2022 $ ( 14,056 ) $ 41 $ 5,882 $ ( 8,133 ) Current period other comprehensive (loss) income: Other comprehensive (loss) income before reclassifications ( 82 ) — 5,658 5,576 Amounts reclassified from accumulated other comprehensive (loss) income (3) — ( 60 ) ( 5,239 ) ( 5,299 ) Effect of taxes ( 2,409 ) 19 ( 123 ) ( 2,513 ) Total current period other comprehensive (loss) income ( 2,491 ) ( 41 ) 296 ( 2,236 ) Accumulated other comprehensive (loss) income at September 30, 2023 $ ( 16,547 ) $ — $ 6,178 $ ( 10,369 ) Nine Months Ended September 30, 2022 Foreign Gain on Sale (1) Change in (2) Total Accumulated other comprehensive (loss) income at December 31, 2021 $ ( 8,759 ) $ 569 $ ( 2,845 ) $ ( 11,035 ) Current period other comprehensive (loss) income: Other comprehensive (loss) income before reclassifications ( 16,099 ) — 10,430 ( 5,669 ) Amounts reclassified from accumulated other comprehensive (loss) income (3) — ( 540 ) 1,640 1,100 Effect of taxes 4,531 144 ( 3,213 ) 1,462 Total current period other comprehensive (loss) income ( 11,568 ) ( 396 ) 8,857 ( 3,107 ) Accumulated other comprehensive (loss) income at September 30, 2022 $ ( 20,327 ) $ 173 $ 6,012 $ ( 14,142 ) (1) Represents the unamortized value of an interest rate hedge agreement, designated as a cash flow hedge, which was sold on December 1, 2016. The fair value of the interest rate hedge agreement, at the date of the sale, was recorded in other comprehensive income, net of tax, and is being reclassified to interest expense when earnings are impacted by the hedged items and as interest payments are made on the Credit Facility from January 31, 2018 to January 31, 2023. (2) Represents the change in fair value of interest rate hedge agreements designated as cash flow hedges. The fair value of the interest rate hedge agreements was recorded in other comprehensive income, net of tax, and will be reclassified to earnings when earnings are impacted by the hedged items, as interest payments are made on the Credit Facility from August 31, 2018 to June 27, 2028 (see “Note 8 – Derivative Instruments and Hedging Activities”). (3) The Company expects to reclassify $ 6.5 million of gains related to the Change in Fair Value of Interest Rate Hedge Agreement from accumulated other comprehensive loss into earnings during the next 12 months.

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2023
Share-Based Payment Arrangement, Recognized Amount [Abstract]
Schedule of Awards Granded	The following awards were granted during the three and nine months ended September 30, 2023 and 2022: Awards Granted Average Grant Date Fair Value Three Months Ended Nine Months Ended Three Months Ended Nine Months Ended September 30, September 30, September 30, September 30, 2023 2022 2023 2022 2023 2022 2023 2022 Employee Stock Awards — 25,059 113,569 177,960 $ — $ 99.47 $ 107.29 $ 92.87 Cash-Settled Restricted Stock Units 2,281 15,694 68,745 78,534 $ 130.47 $ 99.47 $ 110.04 $ 93.81 Non-Employee Director Stock Awards 8,211 10,703 8,211 11,399 $ 127.81 $ 94.79 $ 127.81 $ 95.35 Total 10,492 51,456 190,525 267,893
Schedule of Stock-Based Compensation Expense	The total stock-based compensation expense for the three and nine months ended September 30, 2023 and 2022, and the unrecognized compensation expense at September 30, 2023: Three Months Ended Nine Months Ended September 30, September 30, As of September 30, 2023 (in millions) 2023 2022 2023 2022 Unrecognized Weighted Average Period to Recognize (in years) Employee Stock Awards $ 3,166 $ 3,241 $ 9,394 $ 9,215 $ 19,213 1.65 Cash-Settled Restricted Stock Units 1,709 1,793 5,808 4,242 12,134 1.94 Non-Employee Director Stock Awards 280 276 740 808 770 0.67 Total $ 5,155 $ 5,310 $ 15,942 $ 14,265 $ 32,117

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2023
Stockholders' Equity Note [Abstract]
Schedule of Changes in Stockholders' Equity	Changes in stockholders’ equity for the three and nine months ended September 30, 2023 and 2022 are as follows: Three Months Ended September 30, 2023 Common Stock Additional Retained Treasury Stock Accumulated Shares Amount Capital Earnings Shares Amount Loss Total Balance at June 30, 2023 18,815 24 411,187 734,468 5,131 ( 266,518 ) ( 6,316 ) $ 872,845 Net income — — — 23,740 — — — 23,740 Other comprehensive income — — — — — — ( 4,053 ) ( 4,053 ) Equity compensation — — 3,446 — — — — 3,446 Issuance of shares pursuant to employee stock purchase plan and vesting of restricted stock units 2 — — — — — — — Payments for stock buybacks — — — — — ( 12 ) — ( 12 ) Dividends declared — — — ( 2,636 ) — — — ( 2,636 ) Balance at September 30, 2023 18,817 $ 24 $ 414,633 $ 755,572 5,131 $ ( 266,530 ) $ ( 10,369 ) $ 893,330 Three Months Ended September 30, 2022 Common Stock Additional Retained Treasury Stock Accumulated Shares Amount Capital Earnings Shares Amount Loss Total Balance at June 30, 2022 18,818 $ 23 $ 393,224 $ 680,323 4,887 $ ( 241,566 ) $ ( 12,587 ) $ 819,417 Net income — — — 19,105 — — — 19,105 Other comprehensive loss — — — — — — ( 1,555 ) ( 1,555 ) Equity compensation — — 3,516 — — — — 3,516 Exercise of stock options 5 — 218 — — — — 218 Issuance of shares pursuant to employee stock purchase plan and vesting of restricted stock units 14 — 4 — — — — 4 Payments for stock buybacks ( 3 ) — — — 3 ( 330 ) — ( 330 ) Dividends declared — — — ( 2,636 ) — — — ( 2,636 ) Balance at September 30, 2022 18,834 $ 23 $ 396,962 $ 696,792 4,890 $ ( 241,896 ) $ ( 14,142 ) $ 837,739 Nine Months Ended September 30, 2023 Common Stock Additional Retained Treasury Stock Accumulated Shares Amount Capital Earnings Shares Amount Loss Total Balance at December 31, 2022 18,883 $ 23 $ 401,957 $ 703,030 4,906 $ ( 243,666 ) $ ( 8,133 ) $ 853,211 Net income — — — 60,450 — — — 60,450 Other comprehensive income — — — — — — ( 2,236 ) ( 2,236 ) Equity compensation — — 10,134 — — — — 10,134 Exercise of stock options 8 — 278 — — — — 278 Issuance of shares pursuant to employee stock purchase plan and vesting of restricted stock units 151 1 2,264 — — — — 2,265 Payments for stock buybacks ( 225 ) — — — 225 ( 22,864 ) — ( 22,864 ) Dividends declared — — — ( 7,908 ) — — — ( 7,908 ) Balance at September 30, 2023 18,817 $ 24 $ 414,633 $ 755,572 5,131 $ ( 266,530 ) $ ( 10,369 ) $ 893,330 Nine Months Ended September 30, 2022 Common Stock Additional Retained Treasury Stock Accumulated Shares Amount Capital Earnings Shares Amount Loss Total Balance at December 31, 2021 18,876 $ 23 $ 384,984 $ 649,298 4,659 $ ( 219,800 ) $ ( 11,035 ) $ 803,470 Net income — — — 55,364 — — — 55,364 Other comprehensive loss — — — — — — ( 3,107 ) ( 3,107 ) Equity compensation — — 10,023 — — — — 10,023 Exercise of stock options 13 — 412 — — — — 412 Issuance of shares pursuant to employee stock purchase plan and vesting of restricted stock units 176 — 1,543 — — — — 1,543 Payments for stock buybacks ( 231 ) — — — 231 ( 22,096 ) — ( 22,096 ) Dividends declared — — — ( 7,870 ) — — — ( 7,870 ) Balance at September 30, 2022 18,834 $ 23 $ 396,962 $ 696,792 4,890 $ ( 241,896 ) $ ( 14,142 ) $ 837,739

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2023
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 Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Net Income $ 23,740 $ 19,105 $ 60,450 $ 55,364 Weighted-average number of basic shares outstanding during the period 18,815 18,826 18,795 18,806 Dilutive effect of stock options, RSUs, and performance shares 159 183 163 195 Weighted-average number of diluted shares outstanding during the period 18,974 19,009 18,958 19,001 Basic earnings per share $ 1.26 $ 1.01 $ 3.22 $ 2.94 Diluted earnings per share $ 1.25 $ 1.01 $ 3.19 $ 2.91

Fair Value (Tables)

Fair Value (Tables)	9 Months Ended
	Sep. 30, 2023
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: September 30, 2023 (in thousands) Level 1 Level 2 Level 3 Total Location on Balance Sheet Assets: Interest rate swaps - current portion $ — $ 6,450 $ — $ 6,450 Prepaid expenses and other assets Foreign currency forward and swap contracts — 38 — 38 Prepaid expenses and other assets Interest rate swaps - long-term portion — 2,340 — 2,340 Other assets Company-owned life insurance policies — 18,705 — 18,705 Other assets Liabilities: Interest rate swaps - long-term portion $ — $ 370 $ — $ 370 Other long-term liabilities December 31, 2022 (in thousands) Level 1 Level 2 Level 3 Total Location on Balance Sheet Assets: Interest rate swaps - current portion $ — $ 5,051 $ — $ 5,051 Prepaid expenses and other assets Interest rate swaps - long-term portion — 2,950 — 2,950 Other assets Company-owned life insurance policies — 17,869 — 17,869 Other assets

Basis of Presentation and Nat_3

Basis of Presentation and Nature of Operations - Additional Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023 Office Segment	Sep. 30, 2022 USD ($) Segment	Sep. 30, 2023 Office Segment	Sep. 30, 2022 USD ($) Segment
Basis of Presentation and Nature of Operations [Line Items]
Number of operating segments | Segment	1	1	1	1
Number of reporting segments | Segment	1	1	1	1
Reclassification of interest income | $		$ 0.1		$ 0.2
Domestic | Minimum
Basis of Presentation and Nature of Operations [Line Items]
Number of offices | Office	50		50
International | Minimum
Basis of Presentation and Nature of Operations [Line Items]
Number of offices | Office	20		20

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	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents	$ 5,084	$ 11,257	$ 8,483	$ 8,254
Restricted cash	2,770	1,711	1,993	12,179
Total of cash, cash equivalents, and restricted cash shown in the consolidated statements of cash flows	$ 7,854	$ 12,968	$ 10,476	$ 20,433

Contract Receivables, Net - Sum

Contract Receivables, Net - Summary of Contract Receivables, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Receivables [Abstract]
Billed and billable	$ 219,783	$ 238,449
Allowance for expected credit losses	(4,965)	(6,112)
Contract receivables, net	$ 214,818	$ 232,337

Contract Receivables, Net - Add

Contract Receivables, Net - Additional Information (Details) - Master Receivables Purchase Agreement with MUFG Bank - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Contract Receivables, Net	$ 93.1	$ 159.5
Cash collected not yet remitted to purchaser of billed receivables	$ 10.4	$ 10.4	$ 6.2

Goodwill - Schedule of Changes

Goodwill - Schedule of Changes in Carrying Amount of Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Goodwill [Line Items]
Balance as of December 31, 2022	$ 1,212,898
Add: Goodwill resulting from business combination	21,133
Less: Goodwill resulting from business divestiture	(15,107)
Effect of foreign currency translation	402
Balance as of June 30, 2023	$ 1,219,326

Leases - Additional Information

Leases - Additional Information (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2023 USD ($) Office	Sep. 30, 2023 USD ($)
Lessee Lease Description [Line Items]
Operating leases, option to extend lease		The leases may include options to extend the lease periods for up to 5 years
Finance 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
Finance 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.
Finance 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
Number of office facilities, ceased use | Office	2
Impairment related to operating lease right-of-use asset	$ 2.9
Impairment related to leasehold improvement	2.9
Accrued other future lease-related expenses	$ 2.2	$ 2.2
Minimum
Lessee Lease Description [Line Items]
Operating leases, remaining lease term	1 year	1 year
Finance leases, remaining lease term	1 year	1 year
Maximum
Lessee Lease Description [Line Items]
Operating leases, remaining lease term	15 years	15 years
Finance leases, remaining lease term	15 years	15 years
Operating leases, extendable lease term	5 years	5 years
Finance leases, extendable lease term	5 years	5 years
Operating leases, termination lease term		1 year
Finance leases, termination lease term		1 year

Leases - Summary of Lease Cost

Leases - Summary of Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Operating lease cost	$ 6,324	$ 9,411	$ 19,206	$ 28,349
Finance lease cost - amortization of right-of-use assets	494	105	1,482	105
Finance lease cost - interest	146	21	446	21
Short-term lease cost	162	76	495	353
Variable lease cost	115	59	239	106
Sublease income	0	(26)	(28)	(64)
Total lease cost	$ 7,241	$ 9,646	$ 21,840	$ 28,870

Leases - Summary of Future Mini

Leases - Summary of Future Minimum Lease Payments Under Non-Cancellable Operating and Finance Leases (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Leases [Abstract]
September 30, 2024	$ 23,307
September 30, 2025	27,510
September 30, 2026	23,221
September 30, 2027	18,692
September 30, 2028	15,186
Thereafter	130,521
Total future minimum lease payments	238,437
Less: Interest	(44,489)
Total lease liabilities	193,948
September 30, 2024	2,967
September 30, 2025	2,967
September 30, 2026	2,967
September 30, 2027	2,967
September 30, 2028	2,967
Thereafter	3,708
Total future minimum lease payments	18,543
Less: Interest	(1,825)
Total lease liabilities	$ 16,718

Leases - Summary of Other Infor

Leases - Summary of Other Information Related to Operating and Finance Leases (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Operating cash outflows for operating leases	$ 15,488	$ 30,038
Operating cash outflows for operating leases	446
Financing cash outflows for finance leases	1,780
Right-of-use assets obtained in exchange for operating lease liabilities	$ 10,014	13,434
Property and equipment obtained in exchange for finance lease liabilities		$ 15,027
Weighted-average remaining lease term - Operating leases	11 years 7 months 6 days	11 years 7 months 6 days
Weighted-average remaining lease term - Finance leases	6 years 3 months 18 days	7 years 1 month 6 days
Weighted average discount rate - Operating leases	3.50%	3.30%
Weighted-average discount rate - Finance leases	3.40%	3.40%

Long-Term Debt - Schedule of Lo

Long-Term Debt - Schedule of Long Term Debt (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Average Interest Rate	6.60%	3.30%
Outstanding Balance before debt issuance costs	$ 538,388	$ 561,366
Unamortized debt issuance costs	(4,451)	(5,032)
Total	533,937	556,334
Term Loan
Debt Instrument [Line Items]
Outstanding Balance before debt issuance costs	277,500	288,750
Delayed-Draw Term Loan
Debt Instrument [Line Items]
Outstanding Balance before debt issuance costs	220,000	220,000
Revolving Credit
Debt Instrument [Line Items]
Outstanding Balance before debt issuance costs	$ 40,888	$ 52,616

Long-Term Debt - Additional Inf

Long-Term Debt - Additional Information (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 1,600,000	$ 1,600,000
Line of credit facility, current borrowing capacity	$ 465,800,000	$ 465,800,000
Interest Rate Swap | Cash Flow Hedging | Designated as Hedging Instrument
Debt Instrument [Line Items]
Derivative fixed interest rate	5.50%	5.50%	3.70%
Revolving Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 600,000,000	$ 600,000,000
Unused borrowing capacity amount	$ 557,500,000	$ 557,500,000
Interest rate on credit facility	6.90%	6.60%	3.30%
Delayed Draw Term Loan Facility
Debt Instrument [Line Items]
Unused borrowing capacity amount	$ 180,000,000	$ 180,000,000

Long Term Debt - Schedule of Fu

Long Term Debt - Schedule of Future Scheduled Repayments of Term Loan Principal (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
September 30, 2024	$ 23,250
September 30, 2025	32,500
September 30, 2026	39,000
May 6, 2027 (Maturity)	443,638
Total	538,388	$ 561,366
Term Loan
Debt Instrument [Line Items]
September 30, 2024	15,000
September 30, 2025	18,750
September 30, 2026	22,500
May 6, 2027 (Maturity)	221,250
Total	277,500	288,750
Delayed-Draw Term Loan
Debt Instrument [Line Items]
September 30, 2024	8,250
September 30, 2025	13,750
September 30, 2026	16,500
May 6, 2027 (Maturity)	181,500
Total	220,000	220,000
Revolving Credit
Debt Instrument [Line Items]
May 6, 2027 (Maturity)	40,888
Total	$ 40,888	$ 52,616

Revenue Recognition - Disaggreg

Revenue Recognition - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation Of Revenue [Line Items]
Revenue from clients	$ 501,519	$ 467,777	$ 1,484,886	$ 1,304,355
Time-and-Materials
Disaggregation Of Revenue [Line Items]
Revenue from clients	206,646	188,772	615,859	523,661
Fixed-Price
Disaggregation Of Revenue [Line Items]
Revenue from clients	223,173	210,919	667,711	580,836
Cost-Based
Disaggregation Of Revenue [Line Items]
Revenue from clients	71,700	68,086	201,316	199,858
U.S. Federal Government
Disaggregation Of Revenue [Line Items]
Revenue from clients	279,314	271,609	820,116	715,986
U.S. State and Local Government
Disaggregation Of Revenue [Line Items]
Revenue from clients	76,393	64,910	232,274	194,778
International Government
Disaggregation Of Revenue [Line Items]
Revenue from clients	27,623	23,046	74,598	79,060
Total Government
Disaggregation Of Revenue [Line Items]
Revenue from clients	383,330	359,565	1,126,988	989,824
Commercial
Disaggregation Of Revenue [Line Items]
Revenue from clients	$ 118,189	$ 108,212	$ 357,898	$ 314,531
Customer Concentration Risk | Revenue from Contract with Customer
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	100%	100%	100%	100%
Customer Concentration Risk | Revenue from Contract with Customer | Time-and-Materials
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	41%	40%	41%	40%
Customer Concentration Risk | Revenue from Contract with Customer | Fixed-Price
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	45%	45%	45%	45%
Customer Concentration Risk | Revenue from Contract with Customer | Cost-Based
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	14%	15%	14%	15%
Customer Concentration Risk | Revenue from Contract with Customer | U.S. Federal Government
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	56%	58%	55%	55%
Customer Concentration Risk | Revenue from Contract with Customer | U.S. State and Local Government
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	15%	14%	16%	15%
Customer Concentration Risk | Revenue from Contract with Customer | International Government
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	5%	5%	5%	6%
Customer Concentration Risk | Revenue from Contract with Customer | Total Government
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	76%	77%	76%	76%
Customer Concentration Risk | Revenue from Contract with Customer | Commercial
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	24%	23%	24%	24%
Energy, Environment, Infrastructure, and Disaster Recovery
Disaggregation Of Revenue [Line Items]
Revenue from clients	$ 204,802	$ 179,002	$ 596,089	$ 522,698
Energy, Environment, Infrastructure, and Disaster Recovery | Customer Concentration Risk | Revenue from Contract with Customer
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	41%	38%	40%	40%
Health and Social Programs
Disaggregation Of Revenue [Line Items]
Revenue from clients	$ 210,501	$ 197,225	$ 620,198	$ 511,312
Health and Social Programs | Customer Concentration Risk | Revenue from Contract with Customer
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	42%	42%	42%	39%
Security and Other Civilian & Commercial
Disaggregation Of Revenue [Line Items]
Revenue from clients	$ 86,216	$ 91,550	$ 268,599	$ 270,345
Security and Other Civilian & Commercial | Customer Concentration Risk | Revenue from Contract with Customer
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	17%	20%	18%	21%

Revenue Recognition - Schedule

Revenue Recognition - Schedule of Changes in Contract Balances Due to Adoption of New Accounting Standards (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Contract assets	$ 209,267	$ 169,088
Contract liabilities	(16,989)	(25,773)
Net contract assets (liabilities)	$ 192,278	$ 143,315

Revenue Recognition - Additiona

Revenue Recognition - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Revenue from Contract with Customer [Abstract]
Net contract assets (liabilities)	$ 49
Revenue related to contract liabilities	$ 17.3	$ 27.1

Revenue Recognition - Additio_2

Revenue Recognition - Additional Information (Detail 1) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-10-01 $ in Billions	Sep. 30, 2023 USD ($)
Revenue From Contract With Customer [Line Items]
Unfulfilled performance obligation	$ 1.5
Maximum
Revenue From Contract With Customer [Line Items]
Expected period to satisfy performance obligations	2 years

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities - Additional Information (Details) - Interest Rate Swap - Cash Flow Hedging - Designated as Hedging Instrument - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2023	Sep. 30, 2023
Derivative [Line Items]
Notional amount		$ 275
June 27, 2028
Derivative [Line Items]
Notional amount	$ 100	$ 100
Maturity date	Jun. 27, 2028	Jun. 27, 2028
February 28, 2025
Derivative [Line Items]
Notional amount		$ 100
Maturity date		Feb. 28, 2025
February 28, 2028
Derivative [Line Items]
Notional amount		$ 75
Maturity date		Feb. 28, 2028

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Income Taxes [Line Items]
Effective income tax rate reconciliation, percent	1.40%	11.70%	9.40%	23.20%
Unrecognized tax benefits	$ 26,156		$ 26,156		$ 145	$ 450
Unrecognized tax benefits and related accrued interest	26,800		26,800		200
Unrecognized tax benefits that would impact effective tax rate	4,700		4,700		$ 100
Increase deferred tax asset	9,900		9,900
Increase in unrecognized tax benefits	$ 9,900		$ 9,900
Canadian Entities
Income Taxes [Line Items]
Decrease in effective income tax rate			6.70%
UK Subsidiaries
Income Taxes [Line Items]
Decrease in effective income tax rate	20.20%		7.30%
Domestic Tax Authority
Income Taxes [Line Items]
Research and development costs amortization period			5 years
Foreign Tax Authority
Income Taxes [Line Items]
Research and development costs amortization period			15 years
Internal Revenue Service (IRS) | Latest Tax Year
Income Taxes [Line Items]
Open tax year			2021
Internal Revenue Service (IRS) | Earliest Tax Year
Income Taxes [Line Items]
Open tax year			2019
State Local and Foreign Jurisdictions | Latest Tax Year
Income Taxes [Line Items]
Open tax year			2021
State Local and Foreign Jurisdictions | Earliest Tax Year
Income Taxes [Line Items]
Open tax year			2018

Income Taxes - Effective Income

Income Taxes - Effective Income Tax Rate Reconciliation (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Taxes at statutory rate	21%	21%	21%	21%
State taxes, net of federal benefit	5.80%	5.60%	5.80%	5.60%
Executive compensation	1.40%	1.50%	1.40%	1.50%
Corporate-Owned Life Insurance	(0.20%)	1.10%	(0.20%)	1.10%
Other permanent differences	0.40%	1%	0.30%	0.70%
Prior year tax adjustments	(27.10%)	(0.30%)	(10.80%)	(0.30%)
Uncertain tax position	19.10%		6.90%
Worthless stock	(20.20%)	(17.70%)	(7.30%)	(5.50%)
Capital Loss			(6.70%)
Valuation allowance	3.10%	0.70%	1.90%	1%
Equity-based compensation	(0.60%)	(1.30%)	(1.60%)	(1.40%)
Tax credits	(1.30%)	(0.50%)	(1.30%)	(0.50%)
Taxes at effective rate	1.40%	11.70%	9.40%	23.20%

Income Taxes - Components and R

Income Taxes - Components and Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Transfer pricing	$ 145	$ 145
Section 41 tax credit	4,595
Section 174 expense capitalization	21,416
Total unrecognized tax benefits liabilities	$ 26,156	$ 145

Income Taxes - Unrecognized Tax

Income Taxes - Unrecognized Tax Benefit Reconciliation (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, beginning balance	$ 145	$ 450
Decrease attributable to tax positions taken during the prior period		(305)
Increase attributable to tax positions taken during the current period	26,011
Unrecognized tax benefits, ending balance	$ 26,156	$ 145

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income Loss [Line Items]
Balance		$ 872,845	$ 819,417	$ 853,211	$ 803,470
Current period other comprehensive (loss) income:
Total current period other comprehensive income (loss)		(4,053)	(1,555)	(2,236)	(3,107)
Balance		893,330	837,739	893,330	837,739
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Balance		(10,833)	(16,562)	(14,056)	(8,759)
Current period other comprehensive (loss) income:
Other comprehensive (loss) income before reclassifications		(3,487)	(7,074)	(82)	(16,099)
Effect of taxes		(2,227)	3,309	(2,409)	4,531
Total current period other comprehensive income (loss)		(5,714)	(3,765)	(2,491)	(11,568)
Balance		(16,547)	(20,327)	(16,547)	(20,327)
Gain on Sale of Interest Rate Hedge Agreement
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	[1]		305	41	569
Current period other comprehensive (loss) income:
Amounts reclassified from accumulated other comprehensive (loss) income	[1],[2]		(180)	(60)	(540)
Effect of taxes	[1]		48	19	144
Total current period other comprehensive income (loss)	[1]		(132)	(41)	(396)
Balance	[1]		173		173
Change in Fair Value of Interest Rate Hedge Agreements
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	[3]	4,517	3,670	5,882	(2,845)
Current period other comprehensive (loss) income:
Other comprehensive (loss) income before reclassifications	[3]	4,379	3,128	5,658	10,430
Amounts reclassified from accumulated other comprehensive (loss) income	[2],[3]	(2,101)	142	(5,239)	1,640
Effect of taxes	[3]	(617)	(928)	(123)	(3,213)
Total current period other comprehensive income (loss)	[3]	1,661	2,342	296	8,857
Balance	[3]	6,178	6,012	6,178	6,012
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Balance		(6,316)	(12,587)	(8,133)	(11,035)
Current period other comprehensive (loss) income:
Other comprehensive (loss) income before reclassifications		892	(3,946)	5,576	(5,669)
Amounts reclassified from accumulated other comprehensive (loss) income	[2]	(2,101)	(38)	(5,299)	1,100
Effect of taxes		(2,844)	2,429	(2,513)	1,462
Total current period other comprehensive income (loss)		(4,053)	(1,555)	(2,236)	(3,107)
Balance		$ (10,369)	$ (14,142)	$ (10,369)	$ (14,142)
[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. The Company expects to reclassify $ 6.5 million of gains related to the Change in Fair Value of Interest Rate Hedge Agreement from accumulated other comprehensive loss into earnings during the next 12 months. Represents the change in fair value of interest rate hedge agreements designated as cash flow hedges. The fair value of the interest rate hedge agreements was recorded in other comprehensive income, net of tax, and will be reclassified to earnings when earnings are impacted by the hedged items, as interest payments are made on the Credit Facility from August 31, 2018 to June 27, 2028 (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		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Expects to reclassify net losses related to change in fair value of interest rate hedge agreement from accumulated other comprehensive loss into earnings	$ 6.5		$ 6.5
Effective tax rate	1.40%	11.70%	9.40%	23.20%

Stockholders' Equity - Schedule

Stockholders' Equity - Schedule of Changes in Stockholders' Equity (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Balance	$ 872,845	$ 819,417	$ 853,211	$ 803,470
Net Income (Loss)	23,740	19,105	60,450	55,364
Other comprehensive (loss) income	(4,053)	(1,555)	(2,236)	(3,107)
Equity compensation	3,446	3,516	10,134	10,023
Exercise of stock options		218	278	412
Issuance of shares pursuant to employee stock purchase plan and vesting of restricted stock units		4	2,265	1,543
Payments for stock buybacks	(12)	(330)	(22,864)	(22,096)
Dividends declared	(2,636)	(2,636)	(7,908)	(7,870)
Balance	$ 893,330	$ 837,739	$ 893,330	$ 837,739
Common Stock
Balance (in shares)	18,815	18,818	18,883	18,876
Balance	$ 24	$ 23	$ 23	$ 23
Exercise of stock options (in shares)		5	8	13
Issuance of shares pursuant to employee stock purchase plan and vesting of restricted stock units (in shares)	2	14	151	176
Issuance of shares pursuant to employee stock purchase plan and vesting of restricted stock units			$ 1
Payments for stock buybacks (in shares)		(3)	(225)	(231)
Balance (in shares)	18,817	18,834	18,817	18,834
Balance	$ 24	$ 23	$ 24	$ 23
Additional Paid-in Capital
Balance	411,187	393,224	401,957	384,984
Equity compensation	3,446	3,516	10,134	10,023
Exercise of stock options		218	278	412
Issuance of shares pursuant to employee stock purchase plan and vesting of restricted stock units		4	2,264	1,543
Balance	414,633	396,962	414,633	396,962
Retained Earnings
Balance	734,468	680,323	703,030	649,298
Net Income (Loss)	23,740	19,105	60,450	55,364
Dividends declared	(2,636)	(2,636)	(7,908)	(7,870)
Balance	$ 755,572	$ 696,792	$ 755,572	$ 696,792
Treasury Stock
Balance (in shares)	5,131	4,887	4,906	4,659
Balance	$ (266,518)	$ (241,566)	$ (243,666)	$ (219,800)
Payments for stock buybacks (in shares)		3	225	231
Payments for stock buybacks	$ (12)	$ (330)	$ (22,864)	$ (22,096)
Balance (in shares)	5,131	4,890	5,131	4,890
Balance	$ (266,530)	$ (241,896)	$ (266,530)	$ (241,896)
Accumulated Other Comprehensive Loss
Balance	(6,316)	(12,587)	(8,133)	(11,035)
Other comprehensive (loss) income	(4,053)	(1,555)	(2,236)	(3,107)
Balance	$ (10,369)	$ (14,142)	$ (10,369)	$ (14,142)

Stock-based Compensation - Addi

Stock-based Compensation - Additional Information (Details) - Omnibus Plan - shares		9 Months Ended
	Apr. 04, 2018	Sep. 30, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares grants	2,050,000	2,631
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		1,131,012

Stock-Based Compensation - Sche

Stock-Based Compensation - Schedule Of Awards Granded (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Awards Granted	10,492	51,456	190,525	267,893
Employee Stock Awards
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Awards Granted		25,059	113,569	177,960
Average Grant Date Fair Value	$ 99.47		$ 107.29	$ 92.87
Cash-Settled Restricted Stock Units
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Awards Granted	2,281	15,694	68,745	78,534
Average Grant Date Fair Value	$ 99.47	$ 130.47	$ 110.04	$ 93.81
Non-Employee Director Stock Awards
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Awards Granted	8,211	10,703	8,211	11,399
Average Grant Date Fair Value	$ 94.79	$ 127.81	$ 127.81	$ 95.35

Stock-Based Compensation - Sc_2

Stock-Based Compensation - Schedule of Stock-Based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-Based Compensation Expense	$ 5,155	$ 5,310	$ 15,942	$ 14,265
Stock-Based Compensation Unrecognized	32,117		32,117
Employee Stock Awards
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-Based Compensation Expense	3,166	3,241	9,394	9,215
Stock-Based Compensation Unrecognized	19,213		$ 19,213
Stock-Based Compensation Unrecognized Weighted- Average Period to Recognize (Years)			1 year 7 months 24 days
Cash-Settled Restricted Stock Units
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-Based Compensation Expense	1,709	1,793	$ 5,808	4,242
Stock-Based Compensation Unrecognized	12,134		$ 12,134
Stock-Based Compensation Unrecognized Weighted- Average Period to Recognize (Years)			1 year 11 months 8 days
Non-Employee Director Stock Awards
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-Based Compensation Expense	280	$ 276	$ 740	$ 808
Stock-Based Compensation Unrecognized	$ 770		$ 770
Stock-Based Compensation Unrecognized Weighted- Average Period to Recognize (Years)			8 months 1 day

Acquisition and Divestiture - A

Acquisition and Divestiture - Additional Information (Details) - USD ($) $ in Thousands			9 Months Ended
	Sep. 12, 2023	May 01, 2023	Sep. 30, 2023	Jul. 21, 2023	Dec. 31, 2022
Acquisition and Divestiture [Line Items]
Goodwill			$ 1,219,326		$ 1,212,898
Proceeds from divestiture of a business			47,151
Gain on divestiture			4,302
Accrued and other future expenses			$ 64,681		$ 78,036
Commercial Marketing
Acquisition and Divestiture [Line Items]
Asset purchase agreement date	Sep. 12, 2023
Initial cash consideration				$ 49,500
Proceeds from divestiture of a business	$ 47,100
Gain on divestiture	4,300
Divestiture transactions fees	1,900
Pre-tax gain on divestiture, net of transactions fees	$ 2,400
CMY Solutions, LLC.
Acquisition and Divestiture [Line Items]
Business acquisition date		May 01, 2023
Cash purchase price		$ 32,600
Working capital acquired		1,200
Purchase price allocated to intangibles		10,300
Goodwill		21,100
CMY Solutions, LLC. | Customer Relationships
Acquisition and Divestiture [Line Items]
Purchase price allocated to intangibles		10,200
CMY Solutions, LLC. | Trade Names and Trademarks
Acquisition and Divestiture [Line Items]
Purchase price allocated to intangibles		$ 100

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Details)	9 Months Ended
	Sep. 30, 2023
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		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net Income	$ 23,740	$ 19,105	$ 60,450	$ 55,364
Weighted-average number of basic shares outstanding during the period	18,815	18,826	18,795	18,806
Dilutive effect of stock options, RSUs, and performance shares	159	183	163	195
Weighted-average number of diluted shares outstanding during the period	18,974	19,009	18,958	19,001
Basic earnings per share	$ 1.26	$ 1.01	$ 3.22	$ 2.94
Diluted earnings per share	$ 1.25	$ 1.01	$ 3.19	$ 2.91

Share Repurchase Program - Addi

Share Repurchase Program - Additional Information (Details)	9 Months Ended
	Sep. 30, 2023 USD ($) shares	Sep. 30, 2022 USD ($) shares	Nov. 30, 2021 USD ($)	Sep. 30, 2017 USD ($)
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, authorized amount			$ 200,000,000	$ 100,000,000
Line of credit facility, condition permitted for unlimited share repurchases, leverage ratio			0.5
Net liquidity amount			$ 100,000,000
Share repurchase amount			$ 25,000,000
Stock Repurchased During Period, Shares | shares	180,000	176,375
Stock Repurchased During Period, Value	$ 18,100,000	$ 17,000,000
Credit Facility
Equity Class Of Treasury Stock [Line Items]
Share repurchase amount	$ 93,700,000

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	Sep. 30, 2023	Dec. 31, 2022
Foreign Currency Forward and Swap Contracts | Prepaid Expenses and Other Current Assets
Assets:
Assets, Total	$ 38
Interest Rate Swap | Other Assets
Assets:
Assets, Total	2,340	$ 2,950
Interest Rate Swap | Prepaid Expenses and Other Current Assets
Assets:
Assets, Total	6,450	5,051
Interest Rate Swap | Other Long-Term Liabilities
Liabilities:
Liabilities, Total	370
Company Owned Life Insurance Policies | Other Assets
Assets:
Assets, Total	18,705	17,869
Level 2 | Foreign Currency Forward and Swap Contracts | Prepaid Expenses and Other Current Assets
Assets:
Assets, Total	38
Level 2 | Interest Rate Swap | Other Assets
Assets:
Assets, Total	2,340	2,950
Level 2 | Interest Rate Swap | Prepaid Expenses and Other Current Assets
Assets:
Assets, Total	6,450	5,051
Level 2 | Interest Rate Swap | Other Long-Term Liabilities
Liabilities:
Liabilities, Total	370
Level 2 | Company Owned Life Insurance Policies | Other Assets
Assets:
Assets, Total	$ 18,705	$ 17,869

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Loss Contingencies [Line Items]
Letters of credit	$ 1.6
Standby Letters of Credit
Loss Contingencies [Line Items]
Letters of credit	$ 1.6	$ 2

Subsequent Events - Additional

Subsequent Events - Additional Information (Details)	Nov. 02, 2023 $ / shares
Subsequent Event
Subsequent Event [Line Items]
Cash dividend per share	$ 0.14