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Segment Information - Summary of Revenues by Business Lines (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 956,050	$ 1,004,236	$ 2,710,103	$ 2,954,688
Federal Solution Segment
Segment Reporting Information [Line Items]
Revenues	499,291	498,156	1,394,035	1,457,937
Federal Solution Segment | Defense And Intelligence
Segment Reporting Information [Line Items]
Revenues	343,151	333,289	962,642	953,755
Federal Solution Segment | Engineered Systems
Segment Reporting Information [Line Items]
Revenues	156,140	164,867	431,393	504,182
Critical Infrastructure
Segment Reporting Information [Line Items]
Revenues	456,759	506,080	1,316,068	1,496,751
Critical Infrastructure | Connected Communities
Segment Reporting Information [Line Items]
Revenues	91,902	116,366	263,106	316,626
Critical Infrastructure | Mobility Solutions
Segment Reporting Information [Line Items]
Revenues	$ 364,857	$ 389,714	$ 1,052,962	$ 1,180,125

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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