Goodwill - Summary of Changes in Carrying Value of Goodwill by Reporting Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Goodwill [Line Items]
Beginning Balance	$ 1,792,665	$ 1,661,850
Acquisitions	294,248	129,599
Foreign Exchange	(4,233)	1,216
Ending Balance	2,082,680	1,792,665
Federal Solutions
Goodwill [Line Items]
Beginning Balance	1,686,901	1,591,563
Acquisitions	119,663	95,338
Foreign Exchange	0	0
Ending Balance	1,806,564	1,686,901
Critical Infrastructure
Goodwill [Line Items]
Beginning Balance	105,764	70,287
Acquisitions	174,585	34,261
Foreign Exchange	(4,233)	1,216
Ending Balance	$ 276,116	$ 105,764