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Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Basis Of Consolidation And Presentation [Line Items] |  |  |  |
Adjustment of loss before income tax | $ (326,232) | $ (91,559) | $ (421,025) | $ (144,789)
Contract Drilling |  |  |  |
Basis Of Consolidation And Presentation [Line Items] |  |  |  |
Adjustment of loss before income tax | $ (14,500) |  | $ (6,600) |

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