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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		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Revenues	$ 7,631,408	$ 6,493,167	$ 20,637,749	$ 17,119,373
Percent of total revenues (in percent)	100.00%	100.00%	100.00%	100.00%
United States
Disaggregation of Revenue [Line Items]
Revenues	$ 7,112,960	$ 5,871,453	$ 19,180,023	$ 15,573,776
Percent of total revenues (in percent)	93.30%	90.40%	92.90%	91.10%
Canada
Disaggregation of Revenue [Line Items]
Revenues	$ 275,644	$ 329,066	$ 724,296	$ 778,578
Percent of total revenues (in percent)	3.60%	5.10%	3.50%	4.50%
Australia
Disaggregation of Revenue [Line Items]
Revenues	$ 202,031	$ 195,815	$ 571,222	$ 503,095
Percent of total revenues (in percent)	2.60%	3.00%	2.80%	2.90%
Others
Disaggregation of Revenue [Line Items]
Revenues	$ 40,773	$ 96,833	$ 162,208	$ 263,924
Percent of total revenues (in percent)	0.50%	1.50%	0.80%	1.50%
Fixed price contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 4,813,711	$ 3,725,174	$ 12,517,491	$ 9,489,949
Percent of total revenues (in percent)	63.10%	57.40%	60.70%	55.40%
Unit-price contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 1,692,949	$ 1,769,369	$ 4,882,579	$ 4,830,577
Percent of total revenues (in percent)	22.20%	27.20%	23.70%	28.20%
Cost-plus contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 1,124,748	$ 998,624	$ 3,237,679	$ 2,798,847
Percent of total revenues (in percent)	14.70%	15.40%	15.60%	16.40%