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Revenues - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts receivable balances | $ 160,214 |  |  |  | $ 339,699 |  |  |  | $ 160,214 | $ 339,699 |
Amount amortized and recorded in drilling revenue | 220,801 | $ 207,141 | $ 250,380 | $ 445,927 | 492,297 | $ 598,452 | $ 675,765 | $ 704,171 | 1,124,249 | 2,470,685 | $ 3,326,997
Contract Drilling |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount amortized and recorded in drilling revenue |  |  |  |  |  |  |  |  | 669,126 | 1,308,350 | $ 1,430,492
ASC Topic 606 Revenue from Contracts with Customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts receivable balances | 158,000 |  |  |  | 336,000 |  |  |  | 158,000 | 336,000 |
ASC Topic 606 Revenue from Contracts with Customers | Accounts Payable |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total contract liability | $ 600 |  |  |  | $ 2,700 |  |  |  | 600 | 2,700 |
ASC Topic 606 Revenue from Contracts with Customers | Contract Drilling |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount amortized and recorded in drilling revenue |  |  |  |  |  |  |  |  | $ 100 | $ 1,000 |
Maximum |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts receivable payment terms |  |  |  |  |  |  |  |  | 60 days |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts receivable payment terms |  |  |  |  |  |  |  |  | 30 days |  |

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