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Segment Information - Summary of Business Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Total revenue	$ 1,810,116	$ 1,418,571	$ 5,016,259	$ 3,948,523
Total equity in (losses) earnings of unconsolidated joint ventures	872	10,262	(18,025)	4,497
Federal Solution Segment
Segment Reporting Information [Line Items]
Total revenue	1,105,580	780,114	3,003,791	2,177,457
Total equity in (losses) earnings of unconsolidated joint ventures	1,002	1,435	1,999	3,502
Critical Infrastructure
Segment Reporting Information [Line Items]
Total revenue	704,536	638,457	2,012,468	1,771,066
Total equity in (losses) earnings of unconsolidated joint ventures	$ (130)	$ 8,827	$ (20,024)	$ 995

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