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Revenue Recognition and Related Balance Sheet Accounts - Revenue Disaggregated by Geographic Location and Contract Type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 5,594,387	$ 5,048,610	$ 10,626,206	$ 9,477,436
Percent of total revenues (in percent)	100.00%	100.00%	100.00%	100.00%
United States
Disaggregation of Revenue [Line Items]
Revenues	$ 5,132,607	$ 4,282,902	$ 9,702,323	$ 7,949,267
Percent of total revenues (in percent)	91.80%	84.80%	91.30%	83.90%
Canada
Disaggregation of Revenue [Line Items]
Revenues	$ 220,085	$ 523,258	$ 449,512	$ 1,065,618
Percent of total revenues (in percent)	3.90%	10.40%	4.20%	11.20%
Australia
Disaggregation of Revenue [Line Items]
Revenues	$ 161,251	$ 156,725	$ 307,280	$ 311,402
Percent of total revenues (in percent)	2.90%	3.10%	2.90%	3.30%
Others
Disaggregation of Revenue [Line Items]
Revenues	$ 80,444	$ 85,725	$ 167,091	$ 151,149
Percent of total revenues (in percent)	1.40%	1.70%	1.60%	1.60%
Fixed price contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 3,092,460	$ 2,296,888	$ 5,764,775	$ 4,231,776
Percent of total revenues (in percent)	55.30%	45.50%	54.30%	44.70%
Unit-price contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 1,633,701	$ 1,697,629	$ 3,061,208	$ 3,195,023
Percent of total revenues (in percent)	29.20%	33.60%	28.80%	33.70%
Cost-plus contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 868,226	$ 1,054,093	$ 1,800,223	$ 2,050,637
Percent of total revenues (in percent)	15.50%	20.90%	16.90%	21.60%