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Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items] |
Total revenues | $ 2,417,576
United States |
Disaggregation of Revenue [Line Items] |
Total revenues | 1,712,427
Canada |
Disaggregation of Revenue [Line Items] |
Total revenues | 538,358
Australia |
Disaggregation of Revenue [Line Items] |
Total revenues | 119,457
Latin America and Other |
Disaggregation of Revenue [Line Items] |
Total revenues | 47,334
Unit-price contracts |
Disaggregation of Revenue [Line Items] |
Total revenues | 613,438
Fixed price contracts |
Disaggregation of Revenue [Line Items] |
Total revenues | 1,225,089
Cost-plus contracts |
Disaggregation of Revenue [Line Items] |
Total revenues | $ 579,049

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