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Acquisitions (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
May 24, 2015 | Oct. 31, 2014 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisitions of businesses |  |  |  |  |  |  |  |  |  |  |  | $ 22,278 | $ 128,245 | $ 72,760
Operating revenues |  |  | $ 538,948 | $ 519,729 | $ 571,591 | $ 597,571 | $ 738,872 | $ 847,553 | $ 863,305 | $ 1,414,707 |  | $ 2,227,839 | 3,864,437 | 6,804,197
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 166,917 |  |  |  | 166,659 |  |  |  | $ 166,659 | $ 166,917 | 166,659 | 173,928
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued liabilities |  |  |  |  |  |  | 22,278 |  |  |  | 22,278 |  | 22,278 |
Net income (loss) |  |  | (335,587) | $ (111,211) | $ (184,650) | $ (398,294) | $ (163,654) | $ (295,834) | $ (36,821) | $ 123,634 |  | (1,029,742) | (372,675) | (670,659)
Joint Venture in Saudi Arabia |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |
Two T D Drilling |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisitions of businesses |  | $ 40,300 |  |  |  |  |  |  |  |  |  |  |  |
Additional Contingent payments |  |  | $ 13,900 |  |  |  |  |  |  |  |  | $ 13,900 |  |
Recorded intangible assets |  | 47,700 |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Asset, Total |  | 24,700 |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 28,100 |  |  |  |  |  |  |  |  |  |  |  |
Joint Venture in Saudi Arabia |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisitions of businesses | $ 106,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining equity interest acquired (as a percent) | 49.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | 248,900 |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  | 4,035,004 | 6,953,218
Net income (loss) |  |  |  |  |  |  |  |  |  |  | $ 6,000 |  |  |
Business Acquisition, Pro Forma Information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  | 4,035,004 | 6,953,218
Income (loss) from continuing operations, net of tax |  |  |  |  |  |  |  |  |  |  |  |  | $ (316,633) | $ (668,127)
Income (loss) from continuing operations per share - basic |  |  |  |  |  |  |  |  |  |  |  |  | $ (1.09) | $ (2.27)
Income (loss) from continuing operations per share - diluted |  |  |  |  |  |  |  |  |  |  |  |  | $ (1.09) | $ (2.27)

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