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Summary of Significant Accounting Policies - Revenue Disaggregated by Geographic Location and Contract Type (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 2,807,259 | $ 2,417,576
Percentage Of Total Revenues | 100.00% | 100.00%
Unit-price contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 895,044 | $ 613,438
Percentage Of Total Revenues | 31.90% | 25.30%
Fixed price contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 953,860 | $ 1,225,089
Percentage Of Total Revenues | 34.00% | 50.70%
Cost-plus contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 958,355 | $ 579,049
Percentage Of Total Revenues | 34.10% | 24.00%
United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 2,200,615 | $ 1,712,427
Percentage Of Total Revenues | 78.40% | 70.80%
Canada |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 485,430 | $ 538,358
Percentage Of Total Revenues | 17.30% | 22.30%
Australia |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 41,324 | $ 119,457
Percentage Of Total Revenues | 1.50% | 4.90%
Latin America and Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 79,890 | $ 47,334
Percentage Of Total Revenues | 2.80% | 2.00%

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