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Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2019
Basis Of Consolidation And Presentation [Line Items] |  |  |  |  |  |
Impairment charge of drilling equipment | $ 8,300 |  |  |  |  |
Reimbursement of workers compensation insurance claims included in other current assets |  |  | $ 36,100 | $ 39,000 |  |
Impairment expense related to oil and natural gas properties | $ 604 | $ 9,084 | 11,200 | 2,200 | $ 1,000 |
Right of use asset |  |  | 16,850 | 31,275 |  |
Operating lease liabilities |  |  | 26,214 |  |  |
Adjustment of loss before income tax |  |  | $ (931,018) | (530,378) | $ (367,408) |
Contract Drilling |  |  |  |  |  |
Basis Of Consolidation And Presentation [Line Items] |  |  |  |  |  |
Adjustment of loss before income tax |  |  |  | $ (6,600) |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |
Basis Of Consolidation And Presentation [Line Items] |  |  |  |  |  |
Right of use asset |  |  |  |  |  | $ 31,000
Operating lease liabilities |  |  |  |  |  | $ 35,800

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