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Contracts with Customers - Summary of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation Of Revenue [Line Items]
Revenues	$ 874,697	$ 970,993
Fixed-Price
Disaggregation Of Revenue [Line Items]
Revenues	229,942	308,308
Time-and-Materials
Disaggregation Of Revenue [Line Items]
Revenues	239,665	252,439
Cost-Plus
Disaggregation Of Revenue [Line Items]
Revenues	$ 405,090	$ 410,246

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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

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-Publisher FASB
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