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Business Segments - Additional Information (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) Rigs | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) Rigs Segment Customer | Dec. 31, 2017 USD ($) Customer | Dec. 31, 2016 USD ($) Customer
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reportable business segments | Segment |  |  |  |  |  |  |  |  | 3 |  |
Total operating revenues | $ 795,937 | $ 867,478 | $ 854,418 | $ 809,164 | $ 787,334 | $ 684,989 | $ 579,186 | $ 305,175 | $ 3,326,997 | $ 2,356,684 | $ 915,866
Long-lived assets | $ 4,002,549 |  |  |  | 4,254,730 |  |  |  | $ 4,002,549 | $ 4,254,730 |
Major Customer |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  |  |  | $ 124,000
Number of customers accounted for 10% or more of consolidated revenues | Customer |  |  |  |  |  |  |  |  | 0 | 0 | 1
Major Customer | Revenues | Customer Concentration Risk |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of sales revenues |  |  |  |  |  |  |  |  |  |  | 14.00%
Contract Drilling |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Marketable land-based drilling rigs | Rigs | 252 |  |  |  |  |  |  |  | 252 |  |
Total operating revenues |  |  |  |  |  |  |  |  | $ 1,430,492 | $ 1,040,033 | $ 543,663
Contract Drilling | Canada |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | 9,300 | 13,700 | $ 15,600
Long-lived assets | $ 26,200 |  |  |  | $ 52,000 |  |  |  | $ 26,200 | $ 52,000 |

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