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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 2,839,199 | $ 2,656,348 | $ 5,646,458 | $ 5,073,924
Percentage Of Total Revenues | 100.00% | 100.00% | 100.00% | 100.00%
Unit-price contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 1,020,650 | $ 1,018,145 | $ 1,915,694 | $ 1,631,583
Percentage Of Total Revenues | 35.90% | 38.30% | 33.90% | 32.20%
Cost-plus contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 1,103,135 | $ 605,212 | $ 2,061,490 | $ 1,184,261
Percentage Of Total Revenues | 38.90% | 22.80% | 36.50% | 23.30%
Fixed price contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 715,414 | $ 1,032,991 | $ 1,669,274 | $ 2,258,080
Percentage Of Total Revenues | 25.20% | 38.90% | 29.60% | 44.50%
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 2,561,924 | $ 2,193,437 | $ 4,762,539 | $ 3,905,864
Percentage Of Total Revenues | 90.30% | 82.50% | 84.30% | 77.00%
Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 202,221 | $ 315,173 | $ 687,651 | $ 853,531
Percentage Of Total Revenues | 7.10% | 11.90% | 12.20% | 16.80%
Australia |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 36,886 | $ 113,880 | $ 78,210 | $ 233,337
Percentage Of Total Revenues | 1.30% | 4.30% | 1.40% | 4.60%
Latin America and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 38,168 | $ 33,858 | $ 118,058 | $ 81,192
Percentage Of Total Revenues | 1.30% | 1.30% | 2.10% | 1.60%

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