Segment Information - Summary of Business Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Total revenue	$ 1,670,467	$ 1,356,486	$ 3,206,143	$ 2,529,952
Total equity in (losses) earnings of unconsolidated joint ventures	(16,837)	75	(18,897)	(5,765)
Federal Solution Segment
Segment Reporting Information [Line Items]
Total revenue	988,603	762,797	1,898,211	1,397,343
Total equity in (losses) earnings of unconsolidated joint ventures	1,466	955	997	2,067
Critical Infrastructure
Segment Reporting Information [Line Items]
Total revenue	681,864	593,689	1,307,932	1,132,609
Total equity in (losses) earnings of unconsolidated joint ventures	$ (18,303)	$ (880)	$ (19,894)	$ (7,832)