Goodwill - Summary of Changes in Carrying Value of Goodwill by Reporting Segment (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)
Goodwill [Line Items]
Beginning Balance	$ 1,792,665
Acquisitions	0
Foreign Exchange	(1,222)
Ending Balance	1,791,443
Federal Solutions
Goodwill [Line Items]
Beginning Balance	1,686,901
Acquisitions	0
Foreign Exchange	0
Ending Balance	1,686,901
Critical Infrastructure
Goodwill [Line Items]
Beginning Balance	105,764
Acquisitions	0
Foreign Exchange	(1,222)
Ending Balance	$ 104,542