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Contracts with Customers - Summary of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation Of Revenue [Line Items]
Revenues	$ 956,050	$ 1,004,236	$ 2,710,103	$ 2,954,688
Fixed-Price
Disaggregation Of Revenue [Line Items]
Revenues	246,894	324,901	710,067	944,577
Time-and-Materials
Disaggregation Of Revenue [Line Items]
Revenues	261,566	265,987	754,596	777,807
Cost-Plus
Disaggregation Of Revenue [Line Items]
Revenues	$ 447,590	$ 413,348	$ 1,245,440	$ 1,232,304

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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