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Contracts with Customers - Summary of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation Of Revenue [Line Items]
Revenues	$ 1,418,571	$ 1,134,370	$ 3,948,523	$ 3,092,160
Fixed-Price
Disaggregation Of Revenue [Line Items]
Revenues	452,606	334,853	1,233,712	854,835
Time-and-Materials
Disaggregation Of Revenue [Line Items]
Revenues	355,689	302,236	998,037	836,881
Cost-Plus
Disaggregation Of Revenue [Line Items]
Revenues	$ 610,276	$ 497,281	$ 1,716,774	$ 1,400,444

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