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, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Disaggregation of Revenue [Line Items]
Revenues	$ 12,014,877	$ 7,631,408	$ 29,446,661	$ 20,637,749
Percent of total revenues (in percent)	100.00%	100.00%	100.00%	100.00%
United States
Disaggregation of Revenue [Line Items]
Revenues	$ 11,428,787	$ 7,112,960	$ 27,893,860	$ 19,180,023
Percent of total revenues (in percent)	95.20%	93.30%	94.80%	92.90%
Canada
Disaggregation of Revenue [Line Items]
Revenues	$ 336,808	$ 275,644	$ 828,582	$ 724,296
Percent of total revenues (in percent)	2.80%	3.60%	2.80%	3.50%
Australia
Disaggregation of Revenue [Line Items]
Revenues	$ 221,329	$ 202,031	$ 629,183	$ 571,222
Percent of total revenues (in percent)	1.80%	2.60%	2.10%	2.80%
Others
Disaggregation of Revenue [Line Items]
Revenues	$ 27,953	$ 40,773	$ 95,036	$ 162,208
Percent of total revenues (in percent)	0.20%	0.50%	0.30%	0.80%
Fixed price contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 8,176,256	$ 4,813,711	$ 19,033,523	$ 12,517,491
Percent of total revenues (in percent)	68.10%	63.10%	64.60%	60.70%
Unit-price contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 1,840,389	$ 1,692,949	$ 5,333,188	$ 4,882,579
Percent of total revenues (in percent)	15.30%	22.20%	18.10%	23.70%
Cost-plus contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 1,998,232	$ 1,124,748	$ 5,079,950	$ 3,237,679
Percent of total revenues (in percent)	16.60%	14.70%	17.30%	15.60%