Revenue Recognition (Tables)

9 Months Ended

Sep. 30, 2025

Revenue from Contract with Customer [Abstract]

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 September 30,										Nine Months Ended September 30,
	2025					2024					2025					2024
	Dollars		Percent			Dollars		Percent			Dollars		Percent			Dollars		Percent
Client Market:
Energy, environment, infrastructure, and disaster recovery	$	246,239		53	%	$	237,056		46	%	$	732,182		51	%	$	694,940		46	%
Health and social programs		151,976		33	%		196,772		38	%		480,489		34	%		583,415		38	%
Security and other civilian & commercial		67,190		14	%		83,170		16	%		216,507		15	%		245,108		16	%
Total	$	465,405		100	%	$	516,998		100	%	$	1,429,178		100	%	$	1,523,463		100	%

	Three Months Ended September 30,										Nine Months Ended September 30,
	2025					2024					2025					2024
	Dollars		Percent			Dollars		Percent			Dollars		Percent			Dollars		Percent
Client Type:
U.S. federal government	$	198,042		43	%	$	281,970		55	%	$	641,240		45	%	$	830,070		55	%
U.S. state and local government		81,698		17	%		78,686		15	%		244,491		17	%		240,801		16	%
International government		29,021		6	%		26,817		5	%		85,369		6	%		80,760		5	%
Total Government		308,761		66	%		387,473		75	%		971,100		68	%		1,151,631		76	%
Commercial		156,644		34	%		129,525		25	%		458,078		32	%		371,832		24	%
Total	$	465,405		100	%	$	516,998		100	%	$	1,429,178		100	%	$	1,523,463		100	%

	Three Months Ended September 30,										Nine Months Ended September 30,
	2025					2024					2025					2024
	Dollars		Percent			Dollars		Percent			Dollars		Percent			Dollars		Percent
Contract Mix:
Time-and-materials	$	205,683		44	%	$	220,332		43	%	$	621,422		43	%	$	644,125		42	%
Fixed-price		226,781		49	%		236,770		46	%		703,321		49	%		696,910		46	%
Cost-based		32,941		7	%		59,896		11	%		104,435		8	%		182,428		12	%
Total	$	465,405		100	%	$	516,998		100	%	$	1,429,178		100	%	$	1,523,463		100	%

Schedule of Contract Assets and Liabilities

The following table summarizes the contract assets and liabilities as of September 30, 2025 and December 31, 2024:

	September 30, 2025			December 31, 2024
Contract assets	$	225,946		$	188,941
Contract liabilities (1)		(37,653	)		(24,580	)
Net contract assets (liabilities)	$	188,293		$	164,361

(1)Contract liabilities as of September 30, 2025 include $3.0 million of long-term contract liabilities that is part of "Other long-term liabilities" on the Company's consolidated balance sheets.