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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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 5,620,822	$ 4,459,757	$ 15,098,258	$ 12,657,285
Percent of total revenues (in percent)	100.00%	100.00%	100.00%	100.00%
United States
Disaggregation of Revenue [Line Items]
Revenues	$ 4,816,825	$ 3,760,019	$ 12,766,092	$ 10,751,325
Percent of total revenues (in percent)	85.80%	84.30%	84.60%	84.90%
Canada
Disaggregation of Revenue [Line Items]
Revenues	$ 574,536	$ 512,803	$ 1,640,154	$ 1,503,174
Percent of total revenues (in percent)	10.20%	11.50%	10.90%	11.90%
Australia
Disaggregation of Revenue [Line Items]
Revenues	$ 148,499	$ 130,851	$ 459,901	$ 275,421
Percent of total revenues (in percent)	2.60%	2.90%	3.00%	2.20%
Others
Disaggregation of Revenue [Line Items]
Revenues	$ 80,962	$ 56,084	$ 232,111	$ 127,365
Percent of total revenues (in percent)	1.40%	1.30%	1.50%	1.00%
Fixed price contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 2,718,921	$ 1,875,855	$ 6,950,697	$ 5,370,646
Percent of total revenues (in percent)	48.40%	42.10%	46.00%	42.40%
Unit-price contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 1,803,764	$ 1,597,640	$ 4,998,787	$ 4,407,147
Percent of total revenues (in percent)	32.10%	35.80%	33.10%	34.80%
Cost-plus contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 1,098,137	$ 986,262	$ 3,148,774	$ 2,879,492
Percent of total revenues (in percent)	19.50%	22.10%	20.90%	22.80%