0001193125-26-212358 | 10-Q | XBRL Viewer

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Leases - Summary of Future Minimum Lease Payments Under Non-Cancellable Operating and Finance Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Leases [Abstract]
March 31, 2027	$ 21,690
March 31, 2028	18,237
March 31, 2029	13,268
March 31, 2030	15,447
March 31, 2031	13,590
Thereafter	101,715
Total future minimum lease payments	183,947
Less: Interest	(31,423)
Total lease liabilities	152,524
March 31, 2027	3,041
March 31, 2028	3,041
March 31, 2029	0
March 31, 2030	2,967
March 31, 2031	2,225
Thereafter	0
Total future minimum lease payments	11,274
Less: Interest	(680)
Total lease liabilities	10,594
Operating lease liabilities	152,524
Finance lease liabilities	10,594
Total lease liabilities	163,118
Lease liabilities - current	19,652	$ 21,491
Lease liabilities - non-current	143,466	$ 148,493
Total lease liabilities	$ 163,118

Basis of Presentation	3 Months Ended
Mar. 31, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	NOTE 1 – BASIS OF PRESENTATION Basis of Presentation The accompanying consolidated financial statements are of ICF International, Inc. (“ICFI”) and its wholly-owned 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”). 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. Intercompany transactions and balances have been eliminated. 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 the reported amounts of revenue and expenses. Management evaluates these estimates on an ongoing basis including those that relate to revenue recognition (including estimates of variable considerations and remaining costs to complete fixed-price contracts), expected credit losses, valuation and lives of tangible and intangible assets acquired from business combinations, and reserves for tax benefits and valuation allowances on deferred tax assets. Actual results experienced by the Company may differ from management’s estimates. During the three months ended March 31, 2026 and 2025, the Company recognized net income of $0.4 million and $5.9 million, respectively, as a result of net changes in estimates related to fixed-price contracts accounted for under the percentage-of-completion method. 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 annual 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 as a single operating segment and reporting unit. Operating results for the three-month periods ended March 31, 2026 and 2025 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, 2025 and the notes thereto included in the Company’s Annual Report on Form 10-K. Recent Accounting Pronouncements Accounting Pronouncements Not Yet Adopted Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures In November 2024, the FASB issued ASU 2024-03: Disaggregation of Income Statement Expenses (“ASU 2024-03”), which requires additional disaggregation of certain costs and expenses. ASU 2024-03 specifically requires all public entities to disclose within a tabular format the amounts of (a) purchases of inventory, (b) employee compensation, (c) depreciation, (d) intangible asset amortization, and (e) depreciation, depletion, and amortization recognized as part of oil- and gas-producing activities in each relevant expense caption as well as certain amounts that are already required to be disclosed under current U.S. GAAP. ASU 2024-03 also requires public entities to disclose a qualitative description of the composition of any amounts in relevant expense captions that are not separately disaggregated and the amount and definition of the entity’s selling expenses. ASU 2024-03 will be effective for the Company for the annual reporting periods beginning after December 15, 2026, and interim periods beginning after December 15, 2027, with early adoption permitted. The amendments may be adopted on a prospective or retrospective basis. The Company is currently evaluating the impact of the adoption of ASU 2024-03. Intangibles—Goodwill and Other—Internal-Use Software In September 2025, the FASB issued ASU 2025-06: Targeted Improvements to the Accounting for Internal-Use Software (“ASU 2025-06”), which modernizes the accounting for internal-use software costs by removing all references to software development project stages so that the guidance is neutral to different software development methods. ASU 2025-06 will be effective for the Company for annual reporting periods beginning after December 15, 2027, and interim reporting periods within those annual reporting periods, with early adoption permitted. The amendments may be adopted on a prospective, retrospective, or modified basis. The Company is currently evaluating the impact of the adoption of ASU 2025-06.

Basis of Presentation

3 Months Ended

Mar. 31, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

NOTE 1 – BASIS OF PRESENTATION

Basis of Presentation

The accompanying consolidated financial statements are of ICF International, Inc. (“ICFI”) and its wholly-owned 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”). 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. Intercompany transactions and balances have been eliminated.

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 the reported amounts of revenue and expenses. Management evaluates these estimates on an ongoing basis including those that relate to revenue recognition (including estimates of variable considerations and remaining costs to complete fixed-price contracts), expected credit losses, valuation and lives of tangible and intangible assets acquired from business combinations, and reserves for tax benefits and valuation allowances on deferred tax assets. Actual results experienced by the Company may differ from management’s estimates.

During the three months ended March 31, 2026 and 2025, the Company recognized net income of $0.4 million and $5.9 million, respectively, as a result of net changes in estimates related to fixed-price contracts accounted for under the percentage-of-completion method.

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 annual 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 as a single operating segment and reporting unit. Operating results for the three-month periods ended March 31, 2026 and 2025 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, 2025 and the notes thereto included in the Company’s Annual Report on Form 10-K.

Recent Accounting Pronouncements

Accounting Pronouncements Not Yet Adopted

Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures

In November 2024, the FASB issued ASU 2024-03: Disaggregation of Income Statement Expenses (“ASU 2024-03”), which requires additional disaggregation of certain costs and expenses. ASU 2024-03 specifically requires all public entities to disclose within a tabular format the amounts of (a) purchases of inventory, (b) employee compensation, (c) depreciation, (d) intangible asset amortization, and (e) depreciation, depletion, and amortization recognized as part of oil- and gas-producing activities in each relevant expense caption as well as certain amounts that are already required to be disclosed under current U.S. GAAP. ASU 2024-03 also requires public entities to disclose a qualitative description of the composition of any amounts in relevant expense captions that are not separately disaggregated and the amount and definition of the entity’s selling expenses. ASU 2024-03 will be effective for the Company for the annual reporting periods beginning after December 15, 2026, and interim periods beginning after December 15, 2027, with early adoption permitted. The amendments may be adopted on a prospective or retrospective basis. The Company is currently evaluating the impact of the adoption of ASU 2024-03.

Intangibles—Goodwill and Other—Internal-Use Software

In September 2025, the FASB issued ASU 2025-06: Targeted Improvements to the Accounting for Internal-Use Software (“ASU 2025-06”), which modernizes the accounting for internal-use software costs by removing all references to software development project stages so that the guidance is neutral to different software development methods. ASU 2025-06 will be effective for the Company for annual reporting periods beginning after December 15, 2027, and interim reporting periods within those annual reporting periods, with early adoption permitted. The amendments may be adopted on a prospective, retrospective, or modified basis. The Company is currently evaluating the impact of the adoption of ASU 2025-06.

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 31, 2026 shares
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	On March 7, 2026, John Wasson, our Chair and Chief Executive Officer, (and his spouse) adopted a Rule 10b5-1 trading arrangement intended to satisfy the affirmative defense conditions under Rule 10b5-1(c) of the Securities Exchange Act of 1934, as amended. The trading arrangement provides for the sale of up to 37,133 shares held in trusts associated with Mr. Wasson and terminates on the earlier of the date all shares covered by the trading arrangement have been sold and July 8, 2028.
Name	John Wasson
Title	Chair and Chief Executive Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	March 7, 2026
Aggregate Available	37,133

Earnings Per Share - Additional Information (Details) - shares	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Restricted Stock Awards
Antidilutive securities excluded from computation of earnings per share, amount	2,243	79,863

Long-term Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Average Interest Rate	5.00%	5.60%
Outstanding Balance before debt issuance costs	$ 440,287	$ 402,734
Unamortized debt issuance costs	(1,103)	(1,379)
Total	439,184	401,355
Term Loan
Debt Instrument [Line Items]
Outstanding Balance before debt issuance costs	200,250	200,250
Delayed-Draw Term Loan
Debt Instrument [Line Items]
Outstanding Balance before debt issuance costs	154,000	154,000
Revolving Credit
Debt Instrument [Line Items]
Outstanding Balance before debt issuance costs	$ 86,037	$ 48,484

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

+ References + Details

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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+ Details

Revenue

3 Months Ended

Mar. 31, 2026

Revenue from Contract with Customer [Abstract]

Revenue

NOTE 6 – REVENUE

Substantially all of the Company’s revenue is recognized over time as control of the related goods or services is transferred to customers.

Disaggregation of Revenue

The Company disaggregates revenue from clients 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 market, client type, and contract mix.


	Three Months Ended March 31,
	2026					2025
	Dollars		Percent			Dollars		Percent
Client Market:
Energy, environment, infrastructure, and disaster recovery	$	232,310		53	%	$	238,716		49	%
Health and social programs		142,429		33	%		169,270		35	%
Security and other civilian & commercial		62,761		14	%		79,632		16	%
Total	$	437,500		100	%	$	487,618		100	%


	Three Months Ended March 31,
	2026					2025
	Dollars		Percent			Dollars		Percent
Client Type:
U.S. federal government	$	182,287		42	%	$	238,996		49	%
U.S. state and local government		77,043		18	%		77,111		16	%
International government		31,838		7	%		27,089		5	%
Total Government		291,168		67	%		343,196		70	%
Commercial		146,332		33	%		144,422		30	%
Total	$	437,500		100	%	$	487,618		100	%


	Three Months Ended March 31,
	2026					2025
	Dollars		Percent			Dollars		Percent
Contract Mix:
Time-and-materials	$	191,955		44	%	$	208,993		43	%
Fixed-price		213,769		49	%		238,120		49	%
Cost-based		31,776		7	%		40,505		8	%
Total	$	437,500		100	%	$	487,618		100	%

Contract Assets and Liabilities

Contract assets consist of unbilled receivables on contracts where revenue recognized exceeds the amount billed. Contract liabilities result from advance payments received on a contract or from billings in excess of revenue recognized.

The following table summarizes the contract assets and liabilities as of March 31, 2026 and December 31, 2025:


	Financial Statement Classification	March 31, 2026			December 31, 2025			$ Change
Contract assets	Contract assets	$	192,231		$	186,684		$	5,547
Contract liabilities - current	Contract liabilities		(44,635	)		(43,444	)		(1,191	)
Contract liabilities - non-current	Other long-term liabilities		(12,017	)		(3,043	)		(8,974	)
Net contract assets (liabilities)		$	135,579		$	140,197		$	(4,618	)

The decrease in net contract assets (liabilities) is primarily due to the timing difference between the performance of services and billings to customers. During the three months ended March 31, 2026 and 2025, the Company recognized $13.9 million and $12.8 million in revenue related to the contract liabilities balance at December 31, 2025 and 2024, respectively.

Unfulfilled Performance Obligations

In computing unfulfilled performance obligations (“UPO”), the Company excludes contracts with stated term of one year or less (practical expedient), and contracts with the U.S. federal government. As of March 31, 2026, the UPO was $0.2 billion, of which 46% is expected to be recognized as revenue by December 31, 2026, 64% by December 31, 2027, 86% by December 31, 2028, and the remainder by December 31, 2029.

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-9

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-10

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-15

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-13

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org/606/tableOfContent

+ Details

Restricted Cash (Tables)

3 Months Ended

Mar. 31, 2026

Restricted Cash and Cash Equivalents, Current [Abstract]

Reconciliation of Cash and Cash Equivalents, and Restricted Cash

The following table provides a reconciliation of cash, cash equivalents, and restricted cash as of March 31, 2026 and 2025 to cash, cash equivalents, and restricted cash shown in the consolidated statements of cash flows for the three months ended March 31, 2026 and 2025:


	March 31, 2026		March 31, 2025
Cash and cash equivalents	$	3,883	$	5,718
Restricted cash (1)		61,374		18,374
Total of cash, cash equivalents, and restricted cash shown in the consolidated statements of cash flows	$	65,257	$	24,092

(1)

The balance as of March 31, 2026, includes $12.0 million of long-term restricted cash included within "Other assets" on the Company's consolidated balance sheets. There was no long-term restricted cash balance as of March 31, 2025.

Income Taxes (Tables)	3 Months Ended
Income Taxes (Tables)	Mar. 31, 2026
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation	he Company’s effective tax rate (the “ETR”) was 25.1% and 10.5% for the three months ended March 31, 2026 and 2025, respectively. The change in the ETR was primarily due to an income tax benefit of $4.5 million, or 14.8%, recognized in the first quarter of 2025 related to the regulations under Internal Revenue Code (“IRC”) 987, and income tax provisions of $1.9 million, or 6.9%, in the first quarter of 2026 attributable to stock-based compensation vesting.

Accounts Receivable, Net - Summary of Reconciliation of Cash Collections from Customers of Billed Accounts Receivable Previously Sold to MUFG (Details) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2026

Mar. 31, 2025

Receivables [Abstract]

Beginning balance

$ 3,840

$ 23,339

Collections from customers

^[1],[2]

120,247

118,472

Remittances to MUFG

^[2]

(112,005)

(112,970)

Ending balance

$ 12,082

$ 28,841

[1]	For the three months ended March 31, 2026 and 2025, the Company recorded net outflows of $0.3 million and net inflows of $5.2 million, respectively, in its cash flows from operating activities from the sale of billed accounts receivable.
[2]	For the three months ended March 31, 2026 and 2025, the Company recorded net inflows of $8.2 million and $5.5 million, respectively, in its cash flows from operating activities from the collection of billed accounts receivable that were sold but not yet remitted to MUFG.

Segment Information (Tables)

3 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

Schedule of Segment Revenue, Significant Segment Expenses, and Segment Profit

The segment revenue, significant segment expenses, and segment profit are as follows:


	Three Months Ended March 31,
	2026		2025
Revenue	$	437,500	$	487,618
Significant segment expenses:
Direct labor and related fringe benefit costs		167,983		191,930
Subcontractors and other direct costs		102,654		110,612
Indirect and selling expenses		118,827		131,891
Depreciation and amortization		5,571		5,318
Amortization of intangible assets acquired in business combinations		7,609		9,477
Interest expense		6,806		7,423
Provision for income taxes		6,868		3,150
Other segment expense (1)		660		966
Net Income	$	20,522	$	26,851

(1) Other segment expense includes interest income and gains/losses on foreign currency and disposition of assets.

Accounts Receivable, Net - Summary of Accounts Receivable, Net (Parenthetical) (Details) - USD ($)
$ in Thousands

Mar. 31, 2026

Dec. 31, 2025

Accounts, Notes, Loans and Financing Receivable [Line Items]

Billed and billable

^[1]

$ 243,686

$ 241,129

Other Receivables

Accounts, Notes, Loans and Financing Receivable [Line Items]

Billed and billable

$ 29,300

$ 20,600

[1]	ncludes billed other customer receivables totaling $29.3 million and $20.6 million at March 31, 2026 and December 31, 2025 , respectively, related to the Company’s energy incentive management business for its public utility clients.

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

Mar. 31, 2026

Dec. 31, 2025

Mar. 31, 2025

Cash and Cash Equivalents [Abstract]

Cash and cash equivalents

$ 3,883

$ 5,297

$ 5,718

Restricted cash

^[1]

61,374

18,374

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

$ 65,257

$ 24,092

[1]	The balance as of March 31, 2026, includes $12.0 million of long-term restricted cash included within "Other assets" on the Company's consolidated balance sheets. There was no long-term restricted cash balance as of March 31, 2025.

Basis of Presentation - Additional Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($) Segment	Mar. 31, 2025 USD ($)
Basis of Presentation and Nature of Operations [Line Items]
Net income from changes in estimates related to fixed-price contracts \| $	$ 0.4	$ 5.9
Number of operating segments	1
Number of reporting segments	1

Restricted Cash

3 Months Ended

Mar. 31, 2026

Cash and Cash Equivalents [Abstract]

Restricted Cash

NOTE 2 – RESTRICTED CASH


	March 31, 2026		March 31, 2025
Cash and cash equivalents	$	3,883	$	5,718
Restricted cash (1)		61,374		18,374
Total of cash, cash equivalents, and restricted cash shown in the consolidated statements of cash flows	$	65,257	$	24,092

(1)

Restricted cash is primarily related to the Company’s energy incentive management business for its public utility clients and restricted cash advances on certain programs.

Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2026

Share-Based Payment Arrangement, Recognized Amount [Abstract]

Schedule of Awards Granted

The following awards were granted during the three months ended March 31, 2026 and 2025:


	Awards Granted				Average Grant Date Fair Value
	Three Months Ended				Three Months Ended
	March 31,				March 31,
	2026		2025		2026		2025
Employee Stock Awards - RSUs		131,991		142,721	$	65.89	$	84.83
Employee Stock Awards - PSAs		70,836		75,313	$	66.40	$	76.42
Cash-Settled RSUs		68,613		73,078	$	65.89	$	84.83
Total		271,440		291,112

Accounts Receivable, Net - Summary of Reconciliation of Billed Accounts Receivable Sold to MUFG (Details) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2026

Mar. 31, 2025

Receivables [Abstract]

Beginning balance

$ 38,206

$ 25,966

Billed accounts receivable sold

^[1]

119,898

123,685

Collections from customers

^[1],[2]

(120,247)

(118,472)

Ending balance

$ 37,857

$ 31,179

[1]	For the three months ended March 31, 2026 and 2025, the Company recorded net outflows of $0.3 million and net inflows of $5.2 million, respectively, in its cash flows from operating activities from the sale of billed accounts receivable.
[2]	For the three months ended March 31, 2026 and 2025, the Company recorded net inflows of $8.2 million and $5.5 million, respectively, in its cash flows from operating activities from the collection of billed accounts receivable that were sold but not yet remitted to MUFG.

Leases - Additional Information (Details)	Mar. 31, 2026
Minimum
Lessee Lease Description [Line Items]
Operating leases, remaining lease term	1 year
Finance leases, remaining lease term	1 year
Maximum
Lessee Lease Description [Line Items]
Operating leases, remaining lease term	13 years
Finance leases, remaining lease term	13 years

Revenue (Tables)

3 Months Ended

Mar. 31, 2026

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue


	Three Months Ended March 31,
	2026					2025
	Dollars		Percent			Dollars		Percent
Client Market:
Energy, environment, infrastructure, and disaster recovery	$	232,310		53	%	$	238,716		49	%
Health and social programs		142,429		33	%		169,270		35	%
Security and other civilian & commercial		62,761		14	%		79,632		16	%
Total	$	437,500		100	%	$	487,618		100	%


	Three Months Ended March 31,
	2026					2025
	Dollars		Percent			Dollars		Percent
Client Type:
U.S. federal government	$	182,287		42	%	$	238,996		49	%
U.S. state and local government		77,043		18	%		77,111		16	%
International government		31,838		7	%		27,089		5	%
Total Government		291,168		67	%		343,196		70	%
Commercial		146,332		33	%		144,422		30	%
Total	$	437,500		100	%	$	487,618		100	%


	Three Months Ended March 31,
	2026					2025
	Dollars		Percent			Dollars		Percent
Contract Mix:
Time-and-materials	$	191,955		44	%	$	208,993		43	%
Fixed-price		213,769		49	%		238,120		49	%
Cost-based		31,776		7	%		40,505		8	%
Total	$	437,500		100	%	$	487,618		100	%

Schedule of Contract Assets and Liabilities and Changes in Contract Balances

The following table summarizes the contract assets and liabilities as of March 31, 2026 and December 31, 2025:


	Financial Statement Classification	March 31, 2026			December 31, 2025			$ Change
Contract assets	Contract assets	$	192,231		$	186,684		$	5,547
Contract liabilities - current	Contract liabilities		(44,635	)		(43,444	)		(1,191	)
Contract liabilities - non-current	Other long-term liabilities		(12,017	)		(3,043	)		(8,974	)
Net contract assets (liabilities)		$	135,579		$	140,197		$	(4,618	)

Earnings Per Share - Schedule of Dilutive Effect of Stock Options RSUs and PSAs (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Earnings Per Share [Abstract]
Net Income	$ 20,522	$ 26,851
Weighted-average number of basic shares outstanding during the period	18,242	18,506
Dilutive effect of stock awards	105	107
Weighted-average number of diluted shares outstanding during the period	18,347	18,613
Basic EPS	$ 1.12	$ 1.45
Diluted EPS	$ 1.12	$ 1.44

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
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- Definition

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

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+ Details

- Definition

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

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+ Details

Segment Information - Additional Information (Details)	3 Months Ended
Segment Information - Additional Information (Details)	Mar. 31, 2026 Segment
Segment Reporting [Abstract]
Number of Operating Segments	1
Number of Reportable Segments	1
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]	srt:ChiefExecutiveOfficerMember
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description	The CODM assesses performance of the segment based on consolidated net income that is reported on the Company’s consolidated statements of comprehensive income. The CODM uses consolidated net income to evaluate the Company’s performance against budgets and decide whether to use the profits to invest in the business, paydown debt, repurchase stock, pay dividends, or fund acquisitions

Basis of Presentation (Policies)	3 Months Ended
Basis of Presentation (Policies)	Mar. 31, 2026
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying consolidated financial statements are of ICF International, Inc. (“ICFI”) and its wholly-owned 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”). 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. 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 the reported amounts of revenue and expenses. Management evaluates these estimates on an ongoing basis including those that relate to revenue recognition (including estimates of variable considerations and remaining costs to complete fixed-price contracts), expected credit losses, valuation and lives of tangible and intangible assets acquired from business combinations, and reserves for tax benefits and valuation allowances on deferred tax assets. Actual results experienced by the Company may differ from management’s estimates. During the three months ended March 31, 2026 and 2025, the Company recognized net income of $0.4 million and $5.9 million, respectively, as a result of net changes in estimates related to fixed-price contracts accounted for under the percentage-of-completion method.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Accounting Pronouncements Not Yet Adopted Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures In November 2024, the FASB issued ASU 2024-03: Disaggregation of Income Statement Expenses (“ASU 2024-03”), which requires additional disaggregation of certain costs and expenses. ASU 2024-03 specifically requires all public entities to disclose within a tabular format the amounts of (a) purchases of inventory, (b) employee compensation, (c) depreciation, (d) intangible asset amortization, and (e) depreciation, depletion, and amortization recognized as part of oil- and gas-producing activities in each relevant expense caption as well as certain amounts that are already required to be disclosed under current U.S. GAAP. ASU 2024-03 also requires public entities to disclose a qualitative description of the composition of any amounts in relevant expense captions that are not separately disaggregated and the amount and definition of the entity’s selling expenses. ASU 2024-03 will be effective for the Company for the annual reporting periods beginning after December 15, 2026, and interim periods beginning after December 15, 2027, with early adoption permitted. The amendments may be adopted on a prospective or retrospective basis. The Company is currently evaluating the impact of the adoption of ASU 2024-03. Intangibles—Goodwill and Other—Internal-Use Software In September 2025, the FASB issued ASU 2025-06: Targeted Improvements to the Accounting for Internal-Use Software (“ASU 2025-06”), which modernizes the accounting for internal-use software costs by removing all references to software development project stages so that the guidance is neutral to different software development methods. ASU 2025-06 will be effective for the Company for annual reporting periods beginning after December 15, 2027, and interim reporting periods within those annual reporting periods, with early adoption permitted. The amendments may be adopted on a prospective, retrospective, or modified basis. The Company is currently evaluating the impact of the adoption of ASU 2025-06.

- Definition

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-URI https://asc.fasb.org/1943274/2147482861/275-10-50-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-SubTopic 10
-Topic 275
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-1

+ Details

Accounts Receivable, Net - Summary of Accounts Receivable, Net (Details) - USD ($)
$ in Thousands

Mar. 31, 2026

Dec. 31, 2025

Receivables [Abstract]

Billed and billable

^[1]

$ 243,686

$ 241,129

Allowance for expected credit losses

(3,687)

(3,133)

Accounts receivable, net

$ 239,999

$ 237,996

[1]	ncludes billed other customer receivables totaling $29.3 million and $20.6 million at March 31, 2026 and December 31, 2025 , respectively, related to the Company’s energy incentive management business for its public utility clients.

Fair Value - Schedule of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - Fair Value, Recurring - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Interest Rate Swap \| Accrued Expenses and Other Current Liabilities
Liabilities:
Liabilities, Total	$ 173	$ 615
Interest Rate Swap \| Other Long-Term Liabilities
Liabilities:
Liabilities, Total	1,240	2,060
Company Owned Life Insurance Policies \| Other Assets
Assets:
Assets, Total	25,832	26,373
Cash-Settled RSUs \| Accrued salaries and benefits
Liabilities:
Liabilities, Total	4,854	4,311
Level 2 \| Interest Rate Swap \| Accrued Expenses and Other Current Liabilities
Liabilities:
Liabilities, Total	173	615
Level 2 \| Interest Rate Swap \| Other Long-Term Liabilities
Liabilities:
Liabilities, Total	1,240	2,060
Level 2 \| Company Owned Life Insurance Policies \| Other Assets
Assets:
Assets, Total	25,832	26,373
Level 2 \| Cash-Settled RSUs \| Accrued salaries and benefits
Liabilities:
Liabilities, Total	$ 4,854	$ 4,311

Long-term Debt - Schedule of Future Scheduled Repayments of Term Loan Principal (Details)
$ in Thousands

Mar. 31, 2026

USD ($)

^[1]

Debt Instrument [Line Items]

May 6, 2027 (Maturity)

$ 440,287

Term Loan

Debt Instrument [Line Items]

May 6, 2027 (Maturity)

200,250

Delayed-Draw Term Loan

Debt Instrument [Line Items]

May 6, 2027 (Maturity)

154,000

Revolving Credit

Debt Instrument [Line Items]

May 6, 2027 (Maturity)

$ 86,037

[1]	On April 10, 2026, the Company refinanced the Credit Facility, extending the maturity date to April 10, 2031. See Note 15 – Subsequent Event.

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

Stockholders' Equity

3 Months Ended

Mar. 31, 2026

Stockholders' Equity Note [Abstract]

Stockholders' Equity

NOTE 9 – STOCKHOLDERS’ EQUITY

Accumulated Other Comprehensive Loss

Accumulated other comprehensive loss as of March 31, 2026 and 2025 included the following:


	Three Months Ended March 31, 2026
	Foreign Currency Translation Adjustments			Change in Fair Value of Interest Rate Hedge Agreements			Total
Accumulated other comprehensive (loss) income at December 31, 2025	$	(11,689	)	$	(1,739	)	$	(13,428	)
Current period other comprehensive (loss) income:
Other comprehensive (loss) income before reclassifications		(1,703	)		1,240			(463	)
Amounts reclassified from accumulated other comprehensive (loss) income (1)		—			141			141
Effect of taxes		—			(347	)		(347	)
Total current period other comprehensive (loss) income		(1,703	)		1,034			(669	)
Accumulated other comprehensive (loss) income at March 31, 2026	$	(13,392	)	$	(705	)	$	(14,097	)

(1)

The Company expects to reclassify approximately $0.2 million of unrealized losses related to the Change in Fair Value of Interest Rate Hedge Agreements from accumulated other comprehensive (loss) income into earnings during the next 12 months.


	Three Months Ended March 31, 2025
	Foreign Currency Translation Adjustments			Change in Fair Value of Interest Rate Hedge Agreements			Total
Accumulated other comprehensive (loss) income at December 31, 2024	$	(16,383	)	$	637		$	(15,746	)
Current period other comprehensive (loss) income:
Other comprehensive (loss) income before reclassifications		3,273			(1,854	)		1,419
Amounts reclassified from accumulated other comprehensive (loss) income (1)		(4,094	)		(691	)		(4,785	)
Effect of taxes		—			653			653
Total current period other comprehensive (loss) income		(821	)		(1,892	)		(2,713	)
Accumulated other comprehensive (loss) income at March 31, 2025	$	(17,204	)	$	(1,255	)	$	(18,459	)

(1)

During the first quarter of 2025, the Company reclassified $4.1 million of effect of taxes related to Foreign Currency Translation Adjustments from accumulated other comprehensive (loss) income into earnings in connection with IRC 987.

Share Repurchases

The Company repurchases shares under the $300.0 million share repurchase program authorized by the Company’s board of directors. In addition, the Company repurchases shares in connection with the vesting of restricted stock units (“RSUs”) and performance share awards (“PSAs”) granted to employees.

Repurchases for the three months ended March 31, 2026 and 2025 are as follows:


	Three Months Ended March 31,
	2026				2025
	Shares		Amount Paid		Shares		Amount Paid
Share Repurchase Program		217,513	$	15,042		313,048	$	35,052
Vesting of RSUs and PSAs		47,669		3,524		42,810		4,296
Total		265,182	$	18,566		355,858	$	39,348

- Definition

The entire disclosure for equity.

+ References

+ Details

Accounts Receivable, Net - Summary of Reconciliation of Cash Collections from Customers of Billed Accounts Receivable Previously Sold to MUFG (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from (payments for) sale of billed receivables but not yet remitted to MUFG	$ (8.2)	$ 5.5

Stockholders' Equity - Summary of Repurchase of Shares (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased During Period, Value	$ 18,566	$ 39,348
Stock Repurchased During Period, Shares	265,182	355,858
300.0 Million Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased During Period, Value	$ 15,042	$ 35,052
Stock Repurchased During Period, Shares	217,513	313,048
Vesting of RSUs and PSAs
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased During Period, Value	$ 3,524	$ 4,296
Stock Repurchased During Period, Shares	47,669	42,810

- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References + Details

- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References + Details

Revenue - Additional Information (Detail 1) $ in Billions	Mar. 31, 2026 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2026-04-01
Revenue From Contract With Customer [Line Items]
Unfulfilled performance obligation	$ 0.2
Expected period to satisfy performance obligations	1 year
Revenue, remaining performance obligation, percentage	46.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2027-01-01
Revenue From Contract With Customer [Line Items]
Expected period to satisfy performance obligations	1 year
Revenue, remaining performance obligation, percentage	64.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2029-01-01
Revenue From Contract With Customer [Line Items]
Expected period to satisfy performance obligations	1 year
Revenue, remaining performance obligation, percentage	86.00%

Stockholders' Equity - Components of Accumulated Other Comprehensive Loss (Parenthetical) (Details) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2026

Mar. 31, 2025

Accumulated Other Comprehensive Income (Loss) [Line Items]

Amounts reclassified from accumulated other comprehensive (loss) income

$ 1,900

Expects to reclassify unrealized losses related to change in fair value of interest rate hedge agreement from accumulated other comprehensive (loss) income into earnings

$ 200

Foreign Currency Translation Adjustments

Accumulated Other Comprehensive Income (Loss) [Line Items]

Amounts reclassified from accumulated other comprehensive (loss) income

^[1]

$ 4,094

[1]	The Company expects to reclassify approximately $0.2 million of unrealized losses related to the Change in Fair Value of Interest Rate Hedge Agreements from accumulated other comprehensive (loss) income into earnings during the next 12 months.

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481694/830-30-45-20

+ Details

Revenue - Schedule of Contract Assets and Liabilities and Changes in Contract Balances (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Revenue from Contract with Customer [Abstract]
Contract assets	$ 192,231	$ 186,684
Contract liabilities - current	(44,635)	(43,444)
Contract liabilities - non-current	(12,017)	(3,043)
Net contract assets (liabilities)	135,579	$ 140,197
Change in contract assets	5,547
Change in contract liabilities - current	(1,191)
Change in Contract liabilities - non-current	(8,974)
Change in net contract assets (liabilities)	$ (4,618)

Income Taxes

3 Months Ended

Mar. 31, 2026

Income Tax Disclosure [Abstract]

Income Taxes

NOTE 8 – INCOME TAXES

The Company’s effective tax rate (the “ETR”) was 25.1% and 10.5% for the three months ended March 31, 2026 and 2025, respectively. The change in the ETR was primarily due to an income tax benefit of $4.5 million, or 14.8%, recognized in the first quarter of 2025 related to the regulations under Internal Revenue Code (“IRC”) 987, and income tax provisions of $1.9 million, or 6.9%, in the first quarter of 2026 attributable to stock-based compensation vesting.

- Definition

The entire disclosure for income tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 740
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
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-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/740/tableOfContent

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482603/740-30-50-2

+ Details

Document And Entity Information - shares	3 Months Ended
Document And Entity Information - shares	Mar. 31, 2026	May 01, 2026
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		18,104,180
Document Type	10-Q
Document Period End Date	Mar. 31, 2026
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	001-33045
Entity Tax Identification Number	22-3661438
Entity Incorporation State Country Code	DE
Entity Address, Address Line One	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

Long-term Debt - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 1,600,000
Interest Rate Swap \| Cash Flow Hedging \| Designated as Hedging Instrument
Debt Instrument [Line Items]
Derivative average interest rate	5.10%	5.10%	5.40%
Revolving Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 600,000,000.0
Unused borrowing capacity amount	$ 512,400,000
Interest rate on credit facility	5.00%	5.70%	5.60%

Earnings Per Share

3 Months Ended

Mar. 31, 2026

Earnings Per Share [Abstract]

Earnings Per Share

NOTE 11 – EARNINGS PER SHARE

Earnings per share (“EPS”), including the dilutive effect of stock awards for each period reported is summarized below:


	Three Months Ended
	March 31,
(in thousands, except per share data)	2026		2025
Net Income	$	20,522	$	26,851

Weighted-average number of basic shares outstanding during the period		18,242		18,506
Dilutive effect of stock awards		105		107
Weighted-average number of diluted shares outstanding during the period		18,347		18,613

Basic EPS	$	1.12	$	1.45
Diluted EPS	$	1.12	$	1.44

There were 2,243 and 79,863 of potentially dilutive shares of restricted stock awards that were excluded from the calculation of weighted-average diluted share computations for the three months ended March 31, 2026 and 2025, respectively, because they were anti-dilutive.

Revenue - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation Of Revenue [Line Items]
Revenue from clients	$ 437,500	$ 487,618
Time-and-Materials
Disaggregation Of Revenue [Line Items]
Revenue from clients	191,955	208,993
Fixed-Price
Disaggregation Of Revenue [Line Items]
Revenue from clients	213,769	238,120
Cost-Based
Disaggregation Of Revenue [Line Items]
Revenue from clients	31,776	40,505
U.S. Federal Government
Disaggregation Of Revenue [Line Items]
Revenue from clients	182,287	238,996
U.S. State and Local Government
Disaggregation Of Revenue [Line Items]
Revenue from clients	77,043	77,111
International Government
Disaggregation Of Revenue [Line Items]
Revenue from clients	31,838	27,089
Total Government
Disaggregation Of Revenue [Line Items]
Revenue from clients	291,168	343,196
Commercial
Disaggregation Of Revenue [Line Items]
Revenue from clients	$ 146,332	$ 144,422
Customer Concentration Risk \| Revenue from Contract with Customer
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	100.00%	100.00%
Customer Concentration Risk \| Revenue from Contract with Customer \| Time-and-Materials
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	44.00%	43.00%
Customer Concentration Risk \| Revenue from Contract with Customer \| Fixed-Price
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	49.00%	49.00%
Customer Concentration Risk \| Revenue from Contract with Customer \| Cost-Based
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	7.00%	8.00%
Customer Concentration Risk \| Revenue from Contract with Customer \| U.S. Federal Government
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	42.00%	49.00%
Customer Concentration Risk \| Revenue from Contract with Customer \| U.S. State and Local Government
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	18.00%	16.00%
Customer Concentration Risk \| Revenue from Contract with Customer \| International Government
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	7.00%	5.00%
Customer Concentration Risk \| Revenue from Contract with Customer \| Total Government
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	67.00%	70.00%
Customer Concentration Risk \| Revenue from Contract with Customer \| Commercial
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	33.00%	30.00%
Energy, Environment, Infrastructure, and Disaster Recovery
Disaggregation Of Revenue [Line Items]
Revenue from clients	$ 232,310	$ 238,716
Energy, Environment, Infrastructure, and Disaster Recovery \| Customer Concentration Risk \| Revenue from Contract with Customer
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	53.00%	49.00%
Health and Social Programs
Disaggregation Of Revenue [Line Items]
Revenue from clients	$ 142,429	$ 169,270
Health and Social Programs \| Customer Concentration Risk \| Revenue from Contract with Customer
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	33.00%	35.00%
Security and Other Civilian & Commercial
Disaggregation Of Revenue [Line Items]
Revenue from clients	$ 62,761	$ 79,632
Security and Other Civilian & Commercial \| Customer Concentration Risk \| Revenue from Contract with Customer
Disaggregation Of Revenue [Line Items]
Revenue from clients, Percent	14.00%	16.00%

Subsequent Event

3 Months Ended

Mar. 31, 2026

Subsequent Events [Abstract]

Subsequent Event

NOTE 15 – SUBSEQUENT EVENT

On April 10, 2026, the Company completed the refinancing of its current Amended and Restated Credit Agreement, dated May 6, 2022 (the “Existing Credit Agreement”) by entering into an Amended and Restated Credit Agreement (the “Amended and Restated Credit Agreement”) with PNC Bank, National Association as administrative agent, BOFA Securities, Inc., and Wells Fargo Securities, LLC as the joint lead arrangers, certain other financial institutions as lenders, and certain guarantors party thereto.

The Amended and Restated Credit Agreement: (a) maintains a $600 million revolving credit facility (together and inclusive of a $75 million swing line sublimit and $100 million sublimit for letters of credit); (b) increases the existing term loan facility from $300 million to $450 million; (c) maintains a delayed draw term loan facility of $400 million; (d) increases the existing incremental credit facility from an aggregate principal amount of not more than $300.0 million, to an aggregate principal amount not to exceed the greater of (i) $300.0 million and (ii) 100% of Consolidated EBITDA, plus the amounts of voluntary prepayments of Term Loans and Delayed Draw Term Loans; (e) amends the definition of “Consolidated Indebtedness” to net Unrestricted Cash and replaces the existing maximum Consolidated Leverage Ratio covenant with a maximum Consolidated Net Leverage Ratio covenant, which is maintained at a maximum of 4.50 to 1.00 (with temporary increases to 5.00 to 1.00 for the three fiscal quarters following a “Material Permitted Acquisition”); (f) extends the maturity date of the Credit Facility until April 10, 2031; and (g) modifies certain definitions and covenants.

Accounts Receivable, Net - Summary of Reconciliation of Billed Accounts Receivable Sold to MUFG (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Receivables [Abstract]
Proceeds from (Payments for) Sale of Billed accounts Receivable	$ 0.3	$ 5.2

Accounts Receivable, Net - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Financing Receivable, Past Due [Line Items]
Proceeds from (payments for) sale of billed accounts receivable amount	$ 7.9	$ 10.7
Master Receivables Purchase Agreement with MUFG Bank
Financing Receivable, Past Due [Line Items]
Cash collected not yet remitted to purchaser of billed receivables	$ 2.5		$ 3.4

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

Fair Value

3 Months Ended

Mar. 31, 2026

Fair Value Disclosures [Abstract]

Fair Value

NOTE 12 – FAIR VALUE

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


	March 31, 2026
	Level 1		Level 2		Level 3		Total		Location on Balance Sheet
Assets:
Company-owned life insurance policies	$	—	$	25,832	$	—	$	25,832	Other assets

Liabilities:
Interest rate swaps - current portion	$	—	$	173	$	—	$	173	Accrued expenses and other current liabilities
Interest rate swaps - long-term portion		—		1,240		—		1,240	Other long-term liabilities
Cash-Settled RSUs		—		4,854		—		4,854	Accrued salaries and benefits


	December 31, 2025
	Level 1		Level 2		Level 3		Total		Location on Balance Sheet
Assets:
Company-owned life insurance policies	$	—	$	26,373	$	—	$	26,373	Other assets

Liabilities:
Interest rate swaps - current portion	$	—	$	615	$	—	$	615	Accrued expenses and other current liabilities
Interest rate swaps - long-term portion		—		2,060		—		2,060	Other long-term liabilities
Cash-Settled RSUs		—		4,311		—		4,311	Accrued salaries and benefits

- Definition

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

+ References

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+ Details

Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2026

Stockholders' Equity Note [Abstract]

Components of Accumulated Other Comprehensive Loss

Accumulated other comprehensive loss as of March 31, 2026 and 2025 included the following:


	Three Months Ended March 31, 2026
	Foreign Currency Translation Adjustments			Change in Fair Value of Interest Rate Hedge Agreements			Total
Accumulated other comprehensive (loss) income at December 31, 2025	$	(11,689	)	$	(1,739	)	$	(13,428	)
Current period other comprehensive (loss) income:
Other comprehensive (loss) income before reclassifications		(1,703	)		1,240			(463	)
Amounts reclassified from accumulated other comprehensive (loss) income (1)		—			141			141
Effect of taxes		—			(347	)		(347	)
Total current period other comprehensive (loss) income		(1,703	)		1,034			(669	)
Accumulated other comprehensive (loss) income at March 31, 2026	$	(13,392	)	$	(705	)	$	(14,097	)

(1)


	Three Months Ended March 31, 2025
	Foreign Currency Translation Adjustments			Change in Fair Value of Interest Rate Hedge Agreements			Total
Accumulated other comprehensive (loss) income at December 31, 2024	$	(16,383	)	$	637		$	(15,746	)
Current period other comprehensive (loss) income:
Other comprehensive (loss) income before reclassifications		3,273			(1,854	)		1,419
Amounts reclassified from accumulated other comprehensive (loss) income (1)		(4,094	)		(691	)		(4,785	)
Effect of taxes		—			653			653
Total current period other comprehensive (loss) income		(821	)		(1,892	)		(2,713	)
Accumulated other comprehensive (loss) income at March 31, 2025	$	(17,204	)	$	(1,255	)	$	(18,459	)

(1)

Summary of Repurchases of Shares

Repurchases for the three months ended March 31, 2026 and 2025 are as follows:


	Three Months Ended March 31,
	2026				2025
	Shares		Amount Paid		Shares		Amount Paid
Share Repurchase Program		217,513	$	15,042		313,048	$	35,052
Vesting of RSUs and PSAs		47,669		3,524		42,810		4,296
Total		265,182	$	18,566		355,858	$	39,348

Leases

3 Months Ended

Mar. 31, 2026

Leases [Abstract]

Leases

NOTE 4 – LEASES

At March 31, 2026, the Company had operating and finance leases for facilities and equipment with remaining duration ranging from 1 to 13 years. Future minimum lease payments under non-cancellable operating and finance leases as of March 31, 2026 were as follows:


	Operating			Finance
March 31, 2027	$	21,690		$	3,041
March 31, 2028		18,237			3,041
March 31, 2029		15,447			2,967
March 31, 2030		13,590			2,225
March 31, 2031		13,268			—
Thereafter		101,715			—
Total future minimum lease payments		183,947			11,274
Less: Interest		(31,423	)		(680	)
Total lease liabilities	$	152,524		$	10,594


Operating lease liabilities	$	152,524
Finance lease liabilities		10,594
Total lease liabilities	$	163,118

Lease liabilities - current	$	19,652
Lease liabilities - non-current		143,466
Total lease liabilities	$	163,118

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Loss Contingencies [Line Items]
Letters of credit	$ 1.6
Standby Letters of Credit
Loss Contingencies [Line Items]
Letters of credit	1.6	$ 1.6
Letters of credit guarantees	$ 5.8	$ 7.0

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Revenue - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Revenue from Contract with Customer [Abstract]
Revenue related to contract liabilities	$ 13.9	$ 12.8

Segment Information - Schedule of Segment Revenue, Significant Segment Expenses, and Segment Profit (Details) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2026

Mar. 31, 2025

Segment Reporting Information [Line Items]

Revenue

$ 437,500

$ 487,618

Significant segment expenses:

Direct labor and related fringe benefit costs

167,983

191,930

Subcontractors and other direct costs

102,654

110,612

Indirect and selling expenses

118,827

131,891

Depreciation and amortization

13,180

14,795

Interest expense

6,806

7,423

Provision for income taxes

6,868

3,150

Other segment expense

^[1]

660

966

Net income

20,522

26,851

Depreciation and Amortization

Significant segment expenses:

Depreciation and amortization

5,571

5,318

Amortization of Intangible Assets Acquired in Business Combinations

Significant segment expenses:

Depreciation and amortization

$ 7,609

$ 9,477

[1]	Other segment expense includes interest income and gains/losses on foreign currency and disposition of assets.

Derivative Instruments and Hedging Activities - Additional Information (Details) - Interest Rate Swap - Cash Flow Hedging - Designated as Hedging Instrument $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($)
Derivative [Line Items]
Notional amount	$ 175.0
February 28, 2030
Derivative [Line Items]
Notional amount	$ 50.0
Maturity date	Feb. 28, 2030
June 26, 2030
Derivative [Line Items]
Notional amount	$ 25.0
Maturity date	Jun. 26, 2030
July 31, 2030
Derivative [Line Items]
Notional amount	$ 100.0
Maturity date	Jul. 31, 2030

- Definition

Date derivative contract ends, in YYYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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+ Details

Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Income Taxes [Line Items]
Non-cash deferred income tax expense (benefit)		$ (4.5)
Effective tax rate	25.10%	10.50%
Maximum Defer Of Compensation Subject To Statutory Limitations Percentage		14.80%
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent	$ 1.9
Tax Cuts And Jobs Act Of2017 Complete Accounting Change In Tax Rate Deferred Tax Assets And Liabilities Expected To Reverse In Future	6.90%

CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
ASSETS
Cash and cash equivalents	$ 3,883	$ 5,297
Restricted cash	49,357	47,984
Accounts receivable, net	239,999	237,996
Contract assets	192,231	186,684
Prepaid expenses and other current assets	19,920	18,390
Income tax receivable	19,055	18,087
Total Current Assets	524,445	514,438
Property and Equipment, net	55,393	58,357
Goodwill	1,251,427	1,252,207
Other intangible assets, net	73,644	81,555
Operating lease - right-of-use assets	102,844	106,274
Other assets	45,223	37,340
Total Assets	2,052,976	2,050,171
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	93,252	123,524
Contract liabilities	44,635	43,444
Lease liabilities - current	19,652	21,491
Accrued salaries and benefits	65,694	95,578
Accrued subcontractors and other direct costs	45,673	48,900
Accrued expenses and other current liabilities	86,100	71,340
Total Current Liabilities	355,006	404,277
Debt	439,184	401,355
Lease liabilities - non-current	143,466	148,493
Deferred income taxes	15,375	6,837
Other long-term liabilities	68,036	60,727
Total Liabilities	1,021,067	1,021,689
Commitments and Contingencies (Note 13)
Stockholders’ Equity:
Preferred stock, par value $.001 per share; 5,000,000 shares authorized; none issued
Common stock, par value $.001; 70,000,000 shares authorized;24,513,156 and 24,378,749 shares issued at March 31, 2026 and December 31, 2025 respectively; 18,117,062 and 18,247,837 shares outstanding at March 31, 2026 and December 31, 2025, respectively	24	24
Additional paid-in capital	470,476	465,779
Retained earnings	974,042	956,077
Treasury stock, 5,910,010 and 5,520,672 shares at September 30, 2025 and December 31, 2024, respectively	(398,536)	(379,970)
Accumulated other comprehensive loss	(14,097)	(13,428)
Total Stockholders’ Equity	1,031,909	1,028,482
Total Liabilities and Stockholders’ Equity	$ 2,052,976	$ 2,050,171

Stockholders' Equity - Additional Information (Details)	Mar. 31, 2026 USD ($)
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, authorized amount	$ 300,000,000

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Income Statement [Abstract]
Revenue	$ 437,500	$ 487,618
Direct costs	270,637	302,542
Operating costs and expenses:
Indirect and selling expenses	118,827	131,891
Depreciation and amortization	13,180	14,795
Total operating costs and expenses	132,007	146,686
Operating income	34,856	38,390
Interest, net	(6,709)	(7,337)
Other expense	(757)	(1,052)
Income before income taxes	27,390	30,001
Provision for income taxes	6,868	3,150
Net income	$ 20,522	$ 26,851
Earnings per Share:
Basic	$ 1.12	$ 1.45
Diluted	$ 1.12	$ 1.44
Weighted-average Shares:
Basic	18,242	18,506
Diluted	18,347	18,613
Cash dividends declared per common share	$ 0.14	$ 0.14
Other comprehensive loss net of tax	$ (669)	$ (2,713)
Comprehensive income, net of tax	$ 19,853	$ 24,138

Derivative Instruments and Hedging Activities

3 Months Ended

Mar. 31, 2026

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments and Hedging Activities

NOTE 7 – DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

At March 31, 2026, the Company had floating-to-fixed interest rate swap agreements (the “Swaps”) for an aggregate notional amount of $175.0 million, of which $50.0 million will mature on February 28, 2030, $25.0 million will mature on June 26, 2030, and $100.0 million will mature on July 31, 2030. The Company has designated the Swaps as cash flow hedges. See “Note 5 – Long-Term Debt” for details on the impact of the Swaps on the Company’s interest rates, and “Note 12 – Fair Value” for the fair value of these Swaps.

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

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+ Details

Long-term Debt

3 Months Ended

Mar. 31, 2026

Debt Disclosure [Abstract]

Long-term debt

NOTE 5 – LONG-TERM DEBT

At March 31, 2026 and December 31, 2025, long-term debt consisted of:


	March 31, 2026				December 31, 2025
	Average Interest Rate	Outstanding Balance			Average Interest Rate	Outstanding Balance
Term Loan		$	200,250			$	200,250
Delayed-Draw Term Loan			154,000				154,000
Revolving Credit			86,037				48,484
	5.0%		440,287		5.6%		402,734
Unamortized debt issuance costs			(1,103	)			(1,379	)
Total		$	439,184			$	401,355

As of March 31, 2026, the Company had $512.4 million of unused borrowing capacity under the $600.0 million revolving line of credit 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. The average interest rate on borrowings under the Credit Facility was 5.0% and 5.7% for the three months ended March 31, 2026 and 2025, respectively, and 5.6% for the twelve months ended December 31, 2025. Inclusive of the impact of floating-to-fixed interest rate swaps (see “Note 7 – Derivative Instruments and Hedging Activities”), the average interest rate was 5.1% for both the three months ended March 31, 2026 and 2025, respectively, and 5.4% for the twelve months ended December 31, 2025.

Future scheduled repayments of debt principal are as follows:


Payments due by	Term Loan		Delayed-Draw Term Loan		Revolving Credit		Total
May 6, 2027 (Maturity) (1)		200,250		154,000		86,037		440,287

(1)

On April 10, 2026, the Company refinanced the Credit Facility, extending the maturity date to April 10, 2031. See Note 15 – Subsequent Event.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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+ Details

Segment Information

3 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

Segment Information

NOTE 14 – SEGMENT INFORMATION

The Company provides a broad array of professional services to its clients across several markets, primarily within the U.S. The Company operates as a single reportable and operating segment because the Chief Operating Decision Maker (the “CODM”), which is the Chief Executive Officer, manages the business activities on a consolidated basis. Although the Company disaggregates its revenue by client market and client type, it does not manage its business or allocate resources based on client market or type.

The CODM assesses performance of the segment based on consolidated net income that is reported on the Company’s consolidated statements of comprehensive income. The CODM uses consolidated net income to evaluate the Company’s performance against budgets and decide whether to use the profits to invest in the business, paydown debt, repurchase stock, pay dividends, or fund acquisitions. Asset information provided to the CODM is not used for the purpose of making decisions and assessing performance of the Company.

The segment revenue, significant segment expenses, and segment profit are as follows:


	Three Months Ended March 31,
	2026		2025
Revenue	$	437,500	$	487,618
Significant segment expenses:
Direct labor and related fringe benefit costs		167,983		191,930
Subcontractors and other direct costs		102,654		110,612
Indirect and selling expenses		118,827		131,891
Depreciation and amortization		5,571		5,318
Amortization of intangible assets acquired in business combinations		7,609		9,477
Interest expense		6,806		7,423
Provision for income taxes		6,868		3,150
Other segment expense (1)		660		966
Net Income	$	20,522	$	26,851

(1) Other segment expense includes interest income and gains/losses on foreign currency and disposition of assets.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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+ Details

Stock-based Compensation - Schedule Of Awards Granted (Details) - $ / shares	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Awards Granted	271,440	291,112
Employee Stock Awards - RSUs
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Awards Granted	131,991	142,721
Average Grant Date Fair Value	$ 65.89	$ 84.83
Employee Stock Awards - PSAs
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Awards Granted	70,836	75,313
Average Grant Date Fair Value	$ 66.4	$ 76.42
Cash-Settled RSUs
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Awards Granted	68,613	73,078
Average Grant Date Fair Value	$ 65.89	$ 84.83

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

Restricted Cash - Reconciliation of Cash and Cash Equivalents, and Restricted Cash to the Total of Cash, Cash Equivalents, and Restricted Cash (Parenthetical) (Details) - USD ($)	Mar. 31, 2026	Mar. 31, 2025
Cash and Cash Equivalents [Abstract]
Long-term restricted cash included in other assets	$ 12,000,000	$ 0

Fair Value (Tables)

3 Months Ended

Mar. 31, 2026

Fair Value Disclosures [Abstract]

Schedule of Financial Instruments Measured at Fair Value on Recurring Basis

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


	March 31, 2026
	Level 1		Level 2		Level 3		Total		Location on Balance Sheet
Assets:
Company-owned life insurance policies	$	—	$	25,832	$	—	$	25,832	Other assets

Liabilities:
Interest rate swaps - current portion	$	—	$	173	$	—	$	173	Accrued expenses and other current liabilities
Interest rate swaps - long-term portion		—		1,240		—		1,240	Other long-term liabilities
Cash-Settled RSUs		—		4,854		—		4,854	Accrued salaries and benefits


	December 31, 2025
	Level 1		Level 2		Level 3		Total		Location on Balance Sheet
Assets:
Company-owned life insurance policies	$	—	$	26,373	$	—	$	26,373	Other assets

Liabilities:
Interest rate swaps - current portion	$	—	$	615	$	—	$	615	Accrued expenses and other current liabilities
Interest rate swaps - long-term portion		—		2,060		—		2,060	Other long-term liabilities
Cash-Settled RSUs		—		4,311		—		4,311	Accrued salaries and benefits

Stock-based Compensation - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended
	Apr. 04, 2018	Mar. 31, 2026	Mar. 31, 2025
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 5.4	$ 4.0
Unrecognized compensation expense		$ 36.2
Share-based compensation arrangement by share-based payment award, award vesting period		2 years 1 month 6 days
Omnibus Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares grants	2,050,000
Share-based compensation arrangement by share-based payment award, number of shares available for grant		579,300

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

Accounts Receivable, Net

3 Months Ended

Mar. 31, 2026

Receivables [Abstract]

Accounts Receivable, Net

NOTE 3 – ACCOUNTS RECEIVABLE, NET

Accounts receivable, net consists of contract and other customer receivables. A reconciliation of accounts receivable, net is as follows:


	March 31, 2026			December 31, 2025
Billed and billable (1)	$	243,686		$	241,129
Allowance for expected credit losses		(3,687	)		(3,133	)
Accounts receivable, net	$	239,999		$	237,996

(1)

Includes billed other customer receivables totaling $29.3 million and $20.6 million at March 31, 2026 and December 31, 2025 , respectively, related to the Company’s energy incentive management business for its public utility clients.

The Company sells certain billed accounts receivable in accordance with its Amended Master Receivables Purchase Agreement with MUFG Bank, Ltd. (“MUFG”) that are accounted for as sales under the Accounting Standards Codification (“ASC”) 860, Transfers and Servicing (“ASC 860”). The accounts receivable are sold without recourse and the Company does not retain any ongoing financial interest in the transferred accounts receivable, other than providing servicing activities. The following is a reconciliation of billed accounts receivable sold to MUFG:


	As of and for the Three Months Ended
	March 31, 2026			March 31, 2025
Beginning balance, billed accounts receivable sold and not yet collected	$	38,206		$	25,966
Billed accounts receivable sold (1)		119,898			123,685
Collections from customers (1)		(120,247	)		(118,472	)
Ending balance, billed accounts receivable sold and not yet collected	$	37,857		$	31,179

(1)

For the three months ended March 31, 2026 and 2025, the Company recorded net outflows of $0.3 million and net inflows of $5.2 million, respectively, in its cash flows from operating activities from the sale of billed accounts receivable.

The following is a reconciliation of cash collections from customers of billed accounts receivable previously sold to MUFG that were eligible and accounted for as sales under ASC 860:


	As of and for the Three Months Ended
	March 31, 2026			March 31, 2025
Beginning balance, cash collected but not yet remitted to MUFG	$	3,840		$	23,339
Collections from customers (1)		120,247			118,472
Remittances to MUFG (1)		(112,005	)		(112,970	)
Ending balance, cash collected but not yet remitted to MUFG	$	12,082		$	28,841

(1)

For the three months ended March 31, 2026 and 2025, the Company recorded net inflows of $8.2 million and $5.5 million, respectively, in its cash flows from operating activities from the collection of billed accounts receivable that were sold but not yet remitted to MUFG.

The aggregate impact of the sale of billed accounts receivable on the Company’s operating cash flows was net inflows of $7.9 million and $10.7 million for the three months ended March 31, 2026 and 2025, respectively.

At March 31, 2026 and December 31, 2025, the amounts due to MUFG for cash collected and not yet remitted for billed accounts receivable sold that did not qualify as sales under ASC 860 totaled $2.5 million and $3.4 million, respectively. These amounts are included as part of “Accrued expenses and other current liabilities” on the Company’s consolidated balance sheets, and included within cash flows from financing activities on the Company’s consolidated statements of cash flows.

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Pay vs Performance Disclosure
Net Income (Loss)	$ 20,522	$ 26,851

- Definition

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

+ References

+ Details

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Cash Flows from Operating Activities
Net income	$ 20,522	$ 26,851
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	541	(92)
Deferred income taxes and unrecognized income tax benefits	8,166	(2,594)
Non-cash equity compensation	4,697	4,186
Depreciation and amortization	13,180	14,795
Other operating adjustments, net	839	1,435
Changes in operating assets and liabilities, net of the effects of acquisitions:
Net contract assets and liabilities	(5,093)	(34,610)
Accounts receivable	(2,846)	21,340
Prepaid expenses and other current assets	(1,174)	(1,314)
Operating lease assets and liabilities, net	(2,711)	(1,862)
Accounts payable	(30,122)	(37,674)
Accrued salaries and benefits	(29,754)	(30,465)
Accrued subcontractors and other direct costs	(2,895)	2,064
Accrued expenses and other current liabilities	15,809	80
Income tax receivable and payable	(984)	5,235
Other liabilities	8,683	(409)
Net Cash Used in Operating Activities	(3,142)	(33,034)
Cash Flows from Investing Activities
Payments for purchase of property and equipment and capitalized software	(2,830)	(3,452)
Net Cash Used in Investing Activities	(2,830)	(3,452)
Cash Flows from Financing Activities
Advances from working capital facilities	307,122	512,430
Payments on working capital facilities	(269,569)	(422,406)
Proceeds from other short-term borrowings	8,961	2,780
Repayments of other short-term borrowings	(9,808)	(9,172)
Dividends paid	(2,553)	(2,620)
Payments for share repurchases	(18,348)	(39,342)
Other financing, net	(668)	(646)
Net Cash Provided by Financing Activities	15,137	41,024
Effect of Exchange Rate Changes on Cash, Cash Equivalents, and Restricted Cash	(232)	737
Net Change in Cash, Cash Equivalents, and Restricted Cash	8,933	5,275
Cash, Cash Equivalents, and Restricted Cash, Beginning of Period	56,324	18,817
Cash, Cash Equivalents, and Restricted Cash, End of Period	65,257	24,092
Supplemental Disclosure of Cash Flow Information
Interest	5,926	4,544
Income taxes, net of refunds	$ 82	$ 1,095

CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - $ / shares	Mar. 31, 2026	Dec. 31, 2025
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)	24,513,156	24,378,749
Common stock, outstanding (in shares)	18,117,062	18,247,837
Treasury stock, shares (in shares)	6,396,094	6,130,912

Long-term Debt (Tables)

3 Months Ended

Mar. 31, 2026

Debt Disclosure [Abstract]

Schedule of Debt

At March 31, 2026 and December 31, 2025, long-term debt consisted of:


	March 31, 2026				December 31, 2025
	Average Interest Rate	Outstanding Balance			Average Interest Rate	Outstanding Balance
Term Loan		$	200,250			$	200,250
Delayed-Draw Term Loan			154,000				154,000
Revolving Credit			86,037				48,484
	5.0%		440,287		5.6%		402,734
Unamortized debt issuance costs			(1,103	)			(1,379	)
Total		$	439,184			$	401,355

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
May 6, 2027 (Maturity) (1)		200,250		154,000		86,037		440,287

(1)

On April 10, 2026, the Company refinanced the Credit Facility, extending the maturity date to April 10, 2031. See Note 15 – Subsequent Event.

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-SubTopic 10
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
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-Name Accounting Standards Codification
-Section 55
-Paragraph 69E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69E

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-2

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
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-Paragraph 3
-Publisher FASB
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Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 942
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-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477734/942-470-50-3

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-7

+ Details

Accounts Receivable, Net (Tables)

3 Months Ended

Mar. 31, 2026

Receivables [Abstract]

Summary of Accounts Receivable, Net

Accounts receivable, net consists of contract and other customer receivables. A reconciliation of accounts receivable, net is as follows:


	March 31, 2026			December 31, 2025
Billed and billable (1)	$	243,686		$	241,129
Allowance for expected credit losses		(3,687	)		(3,133	)
Accounts receivable, net	$	239,999		$	237,996

(1)

Summary of Reconciliation of Billed Accounts Receivable Sold to MUFG

The following is a reconciliation of billed accounts receivable sold to MUFG:


	As of and for the Three Months Ended
	March 31, 2026			March 31, 2025
Beginning balance, billed accounts receivable sold and not yet collected	$	38,206		$	25,966
Billed accounts receivable sold (1)		119,898			123,685
Collections from customers (1)		(120,247	)		(118,472	)
Ending balance, billed accounts receivable sold and not yet collected	$	37,857		$	31,179

(1)

Summary of Reconciliation of Cash Collections from Customers of Billed Accounts Receivable Previously Sold to MUFG

The following is a reconciliation of cash collections from customers of billed accounts receivable previously sold to MUFG that were eligible and accounted for as sales under ASC 860:


	As of and for the Three Months Ended
	March 31, 2026			March 31, 2025
Beginning balance, cash collected but not yet remitted to MUFG	$	3,840		$	23,339
Collections from customers (1)		120,247			118,472
Remittances to MUFG (1)		(112,005	)		(112,970	)
Ending balance, cash collected but not yet remitted to MUFG	$	12,082		$	28,841

(1)

Stock-based Compensation

3 Months Ended

Mar. 31, 2026

Share-Based Payment Arrangement [Abstract]

Stock-based Compensation

NOTE 10 – STOCK-BASED COMPENSATION

The Company’s 2018 Amended and Restated Omnibus Incentive Plan (the “2018 A&R Omnibus Plan”) allows the Company to grant up to 2,050,000 total shares of common stock to officers, key employees, and non-employee directors. As of March 31, 2026, the Company had 579,300 shares available for grant under the 2018 A&R Omnibus Plan.

The following awards were granted during the three months ended March 31, 2026 and 2025:


	Awards Granted				Average Grant Date Fair Value
	Three Months Ended				Three Months Ended
	March 31,				March 31,
	2026		2025		2026		2025
Employee Stock Awards - RSUs		131,991		142,721	$	65.89	$	84.83
Employee Stock Awards - PSAs		70,836		75,313	$	66.40	$	76.42
Cash-Settled RSUs		68,613		73,078	$	65.89	$	84.83
Total		271,440		291,112

The total stock-based compensation expense was $5.4 million and $4.0 million for the three months ended March 31, 2026 and 2025, respectively. The unrecognized compensation expense at March 31, 2026 was $36.2 million, which is expected to vest over the next 2.1 years.

Leases (Tables)

3 Months Ended

Mar. 31, 2026

Leases [Abstract]

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 March 31, 2026 were as follows:


	Operating			Finance
March 31, 2027	$	21,690		$	3,041
March 31, 2028		18,237			3,041
March 31, 2029		15,447			2,967
March 31, 2030		13,590			2,225
March 31, 2031		13,268			—
Thereafter		101,715			—
Total future minimum lease payments		183,947			11,274
Less: Interest		(31,423	)		(680	)
Total lease liabilities	$	152,524		$	10,594


Operating lease liabilities	$	152,524
Finance lease liabilities		10,594
Total lease liabilities	$	163,118

Lease liabilities - current	$	19,652
Lease liabilities - non-current		143,466
Total lease liabilities	$	163,118

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss
Balance at Dec. 31, 2024	$ 982,459	$ 24	$ 443,463	$ 874,772	$ (320,054)	$ (15,746)
Balance (in shares) at Dec. 31, 2024		18,666,000
Balance (in shares) at Dec. 31, 2024					5,520
Net Income	26,851			26,851
Other comprehensive loss	(2,713)					(2,713)
Equity compensation	4,186		4,186
Issuance of shares pursuant to vesting of restricted stock units (in shares)		116,000
Payments for share repurchases	(39,343)				$ (39,343)
Payments for share repurchases (in shares)		(356,000)			356,000
Dividends declared	(2,572)			(2,572)
Balance at Mar. 31, 2025	968,868	$ 24	447,649	899,051	$ (359,397)	(18,459)
Balance (in shares) at Mar. 31, 2025		18,426,000
Balance (in shares) at Mar. 31, 2025					5,876
Balance at Dec. 31, 2025	$ 1,028,482	$ 24	465,779	956,077	$ (379,970)	(13,428)
Balance (in shares) at Dec. 31, 2025		18,248,000
Balance (in shares) at Dec. 31, 2025	6,130,912				6,130
Net Income	$ 20,522			20,522
Other comprehensive loss	(669)					(669)
Equity compensation	4,697		4,697
Issuance of shares pursuant to vesting of restricted stock units (in shares)		134,000
Payments for share repurchases	(18,566)				$ (18,566)
Payments for share repurchases (in shares)		(265,000)			266
Dividends declared	(2,557)			(2,557)
Balance at Mar. 31, 2026	$ 1,031,909	$ 24	$ 470,476	$ 974,042	$ (398,536)	$ (14,097)
Balance (in shares) at Mar. 31, 2026		18,117,000
Balance (in shares) at Mar. 31, 2026	6,396,094				6,396

Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2026

Earnings Per Share [Abstract]

Schedule of Dilutive Effect of Stock Options RSUs and PSAs

Earnings per share (“EPS”), including the dilutive effect of stock awards for each period reported is summarized below:


	Three Months Ended
	March 31,
(in thousands, except per share data)	2026		2025
Net Income	$	20,522	$	26,851

Weighted-average number of basic shares outstanding during the period		18,242		18,506
Dilutive effect of stock awards		105		107
Weighted-average number of diluted shares outstanding during the period		18,347		18,613

Basic EPS	$	1.12	$	1.45
Diluted EPS	$	1.12	$	1.44

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

3 Months Ended

Mar. 31, 2026

Mar. 31, 2025

Accumulated Other Comprehensive Income Loss [Line Items]

Balance

$ 1,028,482

$ 982,459

Current period other comprehensive (loss) income:

Amounts reclassified from accumulated other comprehensive (loss) income

(1,900)

Total current period other comprehensive (loss) income

(669)

(2,713)

Balance

1,031,909

968,868

Foreign Currency Translation Adjustments

Accumulated Other Comprehensive Income Loss [Line Items]

Balance

(11,689)

(16,383)

Current period other comprehensive (loss) income:

Other comprehensive (loss) income before reclassifications

(1,703)

3,273

Amounts reclassified from accumulated other comprehensive (loss) income

^[1]

(4,094)

Total current period other comprehensive (loss) income

(1,703)

(821)

Balance

(13,392)

(17,204)

Changes in Fair Value of Interest Rate Hedge Agreements

Accumulated Other Comprehensive Income Loss [Line Items]

Balance

(1,739)

637

Current period other comprehensive (loss) income:

Other comprehensive (loss) income before reclassifications

1,240

(1,854)

Amounts reclassified from accumulated other comprehensive (loss) income

^[1]

141

(691)

Effect of taxes

(347)

653

Total current period other comprehensive (loss) income

1,034

(1,892)

Balance

(705)

(1,255)

Accumulated Other Comprehensive Loss

Accumulated Other Comprehensive Income Loss [Line Items]

Balance

(13,428)

(15,746)

Current period other comprehensive (loss) income:

Other comprehensive (loss) income before reclassifications

(463)

1,419

Amounts reclassified from accumulated other comprehensive (loss) income

^[1]

141

(4,785)

Effect of taxes

(347)

653

Total current period other comprehensive (loss) income

(669)

(2,713)

Balance

$ (14,097)

$ (18,459)

[1]	The Company expects to reclassify approximately $0.2 million of unrealized losses related to the Change in Fair Value of Interest Rate Hedge Agreements from accumulated other comprehensive (loss) income into earnings during the next 12 months.

Subsequent Event - Additional Information (Details) - USD ($)	Apr. 10, 2026	Mar. 31, 2026
Revolving Credit
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity		$ 600,000,000.0
Subsequent Event
Subsequent Event [Line Items]
Line of credit facility, swing line commitment amount	$ 75,000,000
Letters of credit sublimit	$ 100,000,000
Line of credit facility leverage ratio covenant temporary increment	5.00%
Percentage of consolidated EBITDA	100.00%
Subsequent Event \| Delayed Draw Term Loan Facility
Subsequent Event [Line Items]
Line of credit facility	$ 400,000,000
Subsequent Event \| Minimum
Subsequent Event [Line Items]
Debt instrument, principal amount	300,000,000
Line of credit facility, additional revolving credit commitments under existing loan facility	$ 300,000,000
Line of credit facility, leverage ratio covenant	4.50%
Subsequent Event \| Maximum
Subsequent Event [Line Items]
Debt instrument, principal amount	$ 450,000,000
Line of credit facility, additional revolving credit commitments under existing loan facility	300,000,000
Subsequent Event \| Revolving Credit
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity	$ 600,000,000

Commitments and Contingencies

3 Months Ended

Mar. 31, 2026

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

NOTE 13 – COMMITMENTS AND CONTINGENCIES

Letters of Credit and Guarantees

The Company had open standby letters of credit totaling $1.6 million at both March 31, 2026 and December 31, 2025. Open standby letters of credit reduce the Company’s borrowing capacity under the Credit Facility.

At March 31, 2026 and December 31, 2025, the Company had $5.8 million and $7.0 million, respectively, of bank guarantees for facility leases and contract performance obligations.

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.