Segments Information - Summary of Revenues by Business Lines (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenues	$ 1,734,317	$ 1,535,676	$ 6,750,576	$ 5,442,749	$ 4,195,272
Federal Solution Segment
Segment Reporting Information [Line Items]
Revenues	1,003,323	909,608	4,007,114	3,020,701	2,212,987
Federal Solution Segment | Defense And Intelligence
Segment Reporting Information [Line Items]
Revenues			1,772,481	1,539,968	1,368,779
Federal Solution Segment | Engineered Systems
Segment Reporting Information [Line Items]
Revenues			2,234,633	1,480,733	844,208
Critical Infrastructure
Segment Reporting Information [Line Items]
Revenues	$ 730,994	$ 626,068	2,743,462	2,422,048	1,982,285
Critical Infrastructure | Infrastructure - North America
Segment Reporting Information [Line Items]
Revenues			1,683,664	1,472,768	1,265,376
Critical Infrastructure | Infrastructure - Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Revenues			$ 1,059,798	$ 949,280	$ 716,909