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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		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 4,232,003	$ 2,999,816	$ 8,197,528	$ 5,703,397
Percent of total revenues	100.00%	100.00%	100.00%	100.00%
United States
Disaggregation of Revenue [Line Items]
Revenues	$ 3,667,337	$ 2,570,798	$ 6,991,306	$ 4,776,914
Percent of total revenues	86.70%	85.70%	85.20%	83.70%
Canada
Disaggregation of Revenue [Line Items]
Revenues	$ 439,466	$ 327,159	$ 990,371	$ 741,005
Percent of total revenues	10.40%	10.90%	12.10%	13.00%
Australia
Disaggregation of Revenue [Line Items]
Revenues	$ 89,369	$ 62,808	$ 144,570	$ 117,915
Percent of total revenues	2.10%	2.10%	1.80%	2.10%
Others
Disaggregation of Revenue [Line Items]
Revenues	$ 35,831	$ 39,051	$ 71,281	$ 67,563
Percent of total revenues	0.80%	1.30%	0.90%	1.20%
Unit-price contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 1,451,905	$ 1,217,724	$ 2,809,507	$ 2,194,286
Percent of total revenues	34.30%	40.60%	34.30%	38.50%
Cost-plus contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 974,942	$ 759,485	$ 1,893,230	$ 1,422,257
Percent of total revenues	23.00%	25.30%	23.10%	24.90%
Fixed price contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 1,805,156	$ 1,022,607	$ 3,494,791	$ 2,086,854
Percent of total revenues	42.70%	34.10%	42.60%	36.60%