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Revenue Recognition and Related Balance Sheet Accounts - Revenue Disaggregated by Geographic Location and Contract Type (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 20,882,206	$ 17,073,903	$ 12,980,213
Percentage of total revenues	100.00%	100.00%	100.00%
United States
Disaggregation of Revenue [Line Items]
Revenues	$ 17,910,892	$ 14,390,237	$ 11,068,493
Percentage of total revenues	85.80%	84.30%	85.30%
Canada
Disaggregation of Revenue [Line Items]
Revenues	$ 2,045,999	$ 2,020,853	$ 1,557,117
Percentage of total revenues	9.80%	11.80%	12.00%
Australia
Disaggregation of Revenue [Line Items]
Revenues	$ 612,497	$ 428,321	$ 221,038
Percentage of total revenues	2.90%	2.50%	1.70%
Others
Disaggregation of Revenue [Line Items]
Revenues	$ 312,818	$ 234,492	$ 133,565
Percentage of total revenues	1.50%	1.40%	1.00%
Fixed price contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 10,251,037	$ 7,282,537	$ 4,849,038
Percentage of total revenues	49.10%	42.70%	37.40%
Unit-price contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 6,586,982	$ 5,927,335	$ 5,029,100
Percentage of total revenues	31.50%	34.70%	38.70%
Cost-plus contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 4,044,187	$ 3,864,031	$ 3,102,075
Percentage of total revenues	19.40%	22.60%	23.90%