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Segment Information - Summary of Business Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Total revenue	$ 874,697	$ 970,993
Federal Solution Segment
Segment Reporting Information [Line Items]
Total revenue	452,069	477,571
Critical Infrastructure
Segment Reporting Information [Line Items]
Total revenue	$ 422,628	$ 493,422

X

- 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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