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Acquisitions - 2015 Acquisitions (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 24, 2015 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisitions of businesses |  |  |  |  |  |  |  |  |  |  | $ 51,664 | $ 22,278 | $ 128,245
Operating revenues |  | $ 708,277 | $ 662,103 | $ 631,355 | $ 562,550 | $ 538,948 | $ 519,729 | $ 571,591 | $ 597,571 |  | 2,564,285 | 2,227,839 | 3,864,437
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 173,226 |  |  |  | 166,917 |  |  |  | $ 166,659 | 173,226 | 166,917 | 166,659
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ (116,344) | $ (148,532) | $ (132,951) | $ (148,984) | $ (335,587) | $ (111,211) | $ (184,650) | $ (398,294) |  | $ (546,811) | $ (1,029,742) | (372,675)
Joint Venture in Saudi Arabia |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisitions of businesses | $ 106,000 |  |  |  |  |  |  |  |  |  |  |  |
Remaining equity interest acquired (as a percent) | 49.00% |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage | 51.00% |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of equity method investment | $ 44,700 |  |  |  |  |  |  |  |  |  |  |  |
Excess of fair value over carrying value of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,300
Operating revenues |  |  |  |  |  |  |  |  |  | 248,900 |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 2 years |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ 48,058 |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable | 153,819 |  |  |  |  |  |  |  |  |  |  |  |
Other current assets | 58,021 |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net | 89,643 |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | 28,784 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 75,634 |  |  |  |  |  |  |  |  |  |  |  |
Other long-term assets | 7,709 |  |  |  |  |  |  |  |  |  |  |  |
Total assets | 461,668 |  |  |  |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable | 206,599 |  |  |  |  |  |  |  |  |  |  |  |
Accrued liabilities | 74,393 |  |  |  |  |  |  |  |  |  |  |  |
Intangible liability | 13,472 |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax liability | 4,823 |  |  |  |  |  |  |  |  |  |  |  |
Other long-term liabilities | 9,400 |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities | 308,687 |  |  |  |  |  |  |  |  |  |  |  |
Net assets acquired | $ 152,981 |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | $ 6,000 |  |  |

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