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, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Revenues	$ 9,556,997	$ 6,773,007	$ 17,431,784	$ 13,006,341
Percent of total revenues (in percent)	100.00%	100.00%	100.00%	100.00%
United States
Disaggregation of Revenue [Line Items]
Revenues	$ 9,103,463	$ 6,279,010	$ 16,465,073	$ 12,067,063
Percent of total revenues (in percent)	95.20%	92.80%	94.50%	92.90%
Canada
Disaggregation of Revenue [Line Items]
Revenues	$ 215,750	$ 238,406	$ 491,774	$ 448,652
Percent of total revenues (in percent)	2.30%	3.50%	2.80%	3.40%
Australia
Disaggregation of Revenue [Line Items]
Revenues	$ 206,610	$ 198,104	$ 407,854	$ 369,191
Percent of total revenues (in percent)	2.20%	2.90%	2.30%	2.80%
Others
Disaggregation of Revenue [Line Items]
Revenues	$ 31,174	$ 57,487	$ 67,083	$ 121,435
Percent of total revenues (in percent)	0.30%	0.80%	0.40%	0.90%
Fixed price contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 6,083,463	$ 3,948,454	$ 10,857,267	$ 7,703,780
Percent of total revenues (in percent)	63.70%	58.30%	62.30%	59.20%
Unit-price contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 1,770,593	$ 1,734,144	$ 3,492,799	$ 3,189,630
Percent of total revenues (in percent)	18.50%	25.60%	20.00%	24.50%
Cost-plus contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 1,702,941	$ 1,090,409	$ 3,081,718	$ 2,112,931
Percent of total revenues (in percent)	17.80%	16.10%	17.70%	16.30%