Segment Information - Summary of Business Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Total revenue	$ 1,008,721	$ 879,356	$ 1,957,790	$ 1,754,053
Federal Solution Segment
Segment Reporting Information [Line Items]
Total revenue	537,556	442,675	1,029,185	894,744
Critical Infrastructure
Segment Reporting Information [Line Items]
Total revenue	$ 471,165	$ 436,681	$ 928,605	$ 859,309