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Segment Information - Summary of Revenues by Business Lines (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 874,697	$ 970,993
Federal Solution Segment
Segment Reporting Information [Line Items]
Revenues	452,069	477,571
Federal Solution Segment | Cyber & Intelligence
Segment Reporting Information [Line Items]
Revenues	83,328	98,882
Federal Solution Segment | Space & Geospatial Solutions
Segment Reporting Information [Line Items]
Revenues	83,059	51,288
Federal Solution Segment | Missile Defense & C5ISR
Segment Reporting Information [Line Items]
Revenues	144,715	154,569
Federal Solution Segment | Engineered Systems
Segment Reporting Information [Line Items]
Revenues	140,967	172,832
Critical Infrastructure
Segment Reporting Information [Line Items]
Revenues	422,628	493,422
Critical Infrastructure | Mobility Solutions
Segment Reporting Information [Line Items]
Revenues	332,745	391,521
Critical Infrastructure | Connected Communities
Segment Reporting Information [Line Items]
Revenues	$ 89,883	$ 101,901

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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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