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Business Segments - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) Rigs Segment Customer | Dec. 31, 2015 USD ($) Customer | Dec. 31, 2014 USD ($) Customer
Segment Reporting Disclosure [Line Items] |  |  |
Number of reportable business segments | Segment | 2 |  |
Long-lived assets | $ 3,408,963 | $ 3,920,708 |
Major Customer |  |  |
Segment Reporting Disclosure [Line Items] |  |  |
Revenues | $ 124,000 | $ 244,000 |
Number of customers accounted for 10% or more of consolidated revenues | Customer | 1 | 1 | 0
Major Customer | Revenues | Customer Concentration Risk |  |  |
Segment Reporting Disclosure [Line Items] |  |  |
Percentage of sales revenues | 14.00% | 13.00% |
Contract Drilling |  |  |
Segment Reporting Disclosure [Line Items] |  |  |
Marketable land-based drilling rigs | Rigs | 202 |  |
Oil and gas services | $ 543,663 | $ 1,153,892 | $ 1,838,830
Contract Drilling | Canada |  |  |
Segment Reporting Disclosure [Line Items] |  |  |
Oil and gas services | 15,600 | 37,500 | $ 87,500
Long-lived assets | $ 44,000 | $ 53,400 |

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