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Segment Information - Summary of Revenues by Business Lines (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Revenues	$ 1,810,116	$ 1,418,571	$ 5,016,259	$ 3,948,523
Federal Solution Segment
Segment Reporting Information [Line Items]
Revenues	1,105,580	780,114	3,003,791	2,177,457
Federal Solution Segment | Defense And Intelligence
Segment Reporting Information [Line Items]
Revenues	459,318	398,632	1,288,102	1,144,320
Federal Solution Segment | Engineered Systems
Segment Reporting Information [Line Items]
Revenues	646,262	381,482	1,715,689	1,033,137
Critical Infrastructure
Segment Reporting Information [Line Items]
Revenues	704,536	638,457	2,012,468	1,771,066
Critical Infrastructure | Infrastructure-North America
Segment Reporting Information [Line Items]
Revenues	438,307	389,452	1,237,752	1,082,164
Critical Infrastructure | Infrastructure - Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Revenues	$ 266,229	$ 249,005	$ 774,716	$ 688,902

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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