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Summary of Significant Accounting Policies - Revenue Disaggregated by Geographic Location and Contract Type (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 2,506,231 | $ 2,839,199 | $ 5,270,326 | $ 5,646,458
Percent of total revenues | 100.00% | 100.00% | 100.00% | 100.00%
Unit-price contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 918,416 | $ 1,020,650 | $ 1,893,067 | $ 1,915,694
Percent of total revenues | 36.60% | 35.90% | 36.00% | 33.90%
Cost-plus contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 567,928 | $ 1,103,135 | $ 1,256,012 | $ 2,061,490
Percent of total revenues | 22.70% | 38.90% | 23.80% | 36.50%
Fixed price contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 1,019,887 | $ 715,414 | $ 2,121,247 | $ 1,669,274
Percent of total revenues | 40.70% | 25.20% | 40.20% | 29.60%
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 2,207,876 | $ 2,561,924 | $ 4,475,962 | $ 4,762,539
Percent of total revenues | 88.10% | 90.30% | 85.00% | 84.30%
Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 212,820 | $ 202,221 | $ 597,045 | $ 687,651
Percent of total revenues | 8.50% | 7.10% | 11.30% | 12.20%
Australia |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 56,077 | $ 36,886 | $ 107,127 | $ 78,210
Percent of total revenues | 2.20% | 1.30% | 2.00% | 1.40%
Latin America and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 29,458 | $ 38,168 | $ 90,192 | $ 118,058
Percent of total revenues | 1.20% | 1.30% | 1.70% | 2.10%

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