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Goodwill - Summary of Changes in Carrying Value of Goodwill by Reporting Segment (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2025 USD ($)
Goodwill [Line Items]
Beginning Balance	$ 2,082,680
Acquisitions	79,195
Foreign Exchange	1,594
Ending Balance	2,163,469
Federal Solutions
Goodwill [Line Items]
Beginning Balance	1,806,564
Acquisitions	55,183
Foreign Exchange	0
Ending Balance	1,861,747
Critical Infrastructure
Goodwill [Line Items]
Beginning Balance	276,116
Acquisitions	24,012
Foreign Exchange	1,594
Ending Balance	$ 301,722

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Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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