Segment Information and Geographic Data - Schedule of Segment Revenue, Significant Segment Expenses, and Segment Profit (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Revenue		$ 1,872,851	$ 2,019,787	$ 1,963,238
Significant segment expenses:
Direct labor & related fringe benefit costs		722,849	775,239	730,322
Subcontractors & other direct costs		453,986	506,777	534,696
Indirect and selling expenses		492,404	518,453	505,162
Depreciation and amortization		58,147	53,476	60,738
Interest expense		31,268	29,878	39,952
Provision for income taxes		20,405	27,888	13,935
Other segment expense (income)	[1]	2,204	(2,094)	(4,179)
Net income		91,588	110,170	82,612
Depreciation and Amortization
Significant segment expenses:
Depreciation and amortization		21,140	20,484	25,277
Amortization of Intangible Assets Acquired in Business Combinations
Significant segment expenses:
Depreciation and amortization		$ 37,007	$ 32,992	$ 35,461

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