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Goodwill - Summary of Changes in Carrying Value of Goodwill by Reporting Segment (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Goodwill [Line Items]
Beginning Balance	$ 1,661,850
Acquisitions	135,110
Foreign Exchange	370
Ending Balance	1,797,330
Federal Solutions
Goodwill [Line Items]
Beginning Balance	1,591,563
Acquisitions	110,984
Foreign Exchange	0
Ending Balance	1,702,547
Critical Infrastructure
Goodwill [Line Items]
Beginning Balance	70,287
Acquisitions	24,126
Foreign Exchange	370
Ending Balance	$ 94,783

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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