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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Revenues	$ 6,773,007	$ 5,594,387	$ 13,006,341	$ 10,626,206
Percent of total revenues (in percent)	100.00%	100.00%	100.00%	100.00%
United States
Disaggregation of Revenue [Line Items]
Revenues	$ 6,279,010	$ 5,132,607	$ 12,067,063	$ 9,702,323
Percent of total revenues (in percent)	92.80%	91.80%	92.90%	91.30%
Canada
Disaggregation of Revenue [Line Items]
Revenues	$ 238,406	$ 220,085	$ 448,652	$ 449,512
Percent of total revenues (in percent)	3.50%	3.90%	3.40%	4.20%
Australia
Disaggregation of Revenue [Line Items]
Revenues	$ 198,104	$ 161,251	$ 369,191	$ 307,280
Percent of total revenues (in percent)	2.90%	2.90%	2.80%	2.90%
Others
Disaggregation of Revenue [Line Items]
Revenues	$ 57,487	$ 80,444	$ 121,435	$ 167,091
Percent of total revenues (in percent)	0.80%	1.40%	0.90%	1.60%
Fixed price contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 3,948,454	$ 3,092,460	$ 7,703,780	$ 5,764,775
Percent of total revenues (in percent)	58.30%	55.30%	59.20%	54.30%
Unit-price contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 1,734,144	$ 1,633,701	$ 3,189,630	$ 3,061,208
Percent of total revenues (in percent)	25.60%	29.20%	24.50%	28.80%
Cost-plus contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 1,090,409	$ 868,226	$ 2,112,931	$ 1,800,223
Percent of total revenues (in percent)	16.10%	15.50%	16.30%	16.90%