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.