Segment Information - Summary of Revenues by Business Lines (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Segment Reporting Information [Line Items]
Revenues	$ 1,650,548	$ 1,621,748	$ 4,717,591	$ 4,760,431
Federal Solution Segment
Segment Reporting Information [Line Items]
Revenues	804,553	788,607	2,323,769	2,436,628
Federal Solution Segment \| Defense And Intelligence
Segment Reporting Information [Line Items]
Revenues	536,542	468,935	1,570,296	1,369,832
Federal Solution Segment \| Engineered Systems
Segment Reporting Information [Line Items]
Revenues	268,011	319,672	753,473	1,066,796
Critical Infrastructure
Segment Reporting Information [Line Items]
Revenues	845,995	833,141	2,393,822	2,323,803
Critical Infrastructure \| Infrastructure - North America
Segment Reporting Information [Line Items]
Revenues	537,663	528,564	1,511,759	1,479,720
Critical Infrastructure \| Infrastructure - Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Revenues	$ 308,332	$ 304,577	$ 882,063	$ 844,083

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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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details