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Revenues - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts receivable balances | $ 339,699 |  |  |  | $ 558,817 |  |  |  | $ 339,699 | $ 558,817 |
Amount amortized and recorded in drilling revenue | 492,297 | $ 598,452 | $ 675,765 | $ 704,171 | 795,937 | $ 867,478 | $ 854,418 | $ 809,164 | 2,470,685 | 3,326,997 | $ 2,356,684
Contract Drilling |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount amortized and recorded in drilling revenue |  |  |  |  |  |  |  |  | 1,308,350 | 1,430,492 | $ 1,040,033
ASC Topic 606 Revenue from Contracts with Customers |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts receivable balances | 336,000 |  |  |  | 554,000 |  |  |  | 336,000 | 554,000 |
ASC Topic 606 Revenue from Contracts with Customers | Accounts Payable |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total contract liability | $ 2,700 |  |  |  | $ 7,600 |  |  |  | 2,700 | 7,600 |
ASC Topic 606 Revenue from Contracts with Customers | Contract Drilling |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount amortized and recorded in drilling revenue |  |  |  |  |  |  |  |  | $ 1,000 | $ 1,600 |
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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