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Revenues - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Accounts receivable balances | $ 157,981 |  | $ 157,981 |  | $ 339,699
Amount amortized and recorded in drilling revenue | 250,380 | $ 675,765 | 696,307 | $ 1,379,936 |
Contract Drilling |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Amount amortized and recorded in drilling revenue | 171,134 | $ 348,138 | 438,498 | 720,530 |
ASC Topic 606 Revenue from Contracts with Customers |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Accounts receivable balances | 157,000 |  | 157,000 |  | 336,000
ASC Topic 606 Revenue from Contracts with Customers | Accounts Payable |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Total contract liability | $ 900 |  | 900 |  | $ 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 | $ 800 |
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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