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Revenues - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Accounts receivable balances | $ 411,145 |  | $ 411,145 |  | $ 558,817
Amount amortized and recorded in drilling revenue | 598,452 | $ 867,478 | 1,978,388 | $ 2,531,060 |
Contract Drilling |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Amount amortized and recorded in drilling revenue | 317,035 | $ 365,280 | 1,037,565 | 1,043,005 |
ASC Topic 606 Revenue from Contracts with Customers |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Accounts receivable balances | 407,000 |  | 407,000 |  | 554,000
ASC Topic 606 Revenue from Contracts with Customers | Accounts Payable |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Total contract liability | $ 6,600 |  | 6,600 |  | $ 7,600
ASC Topic 606 Revenue from Contracts with Customers | Contract Drilling |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Amount amortized and recorded in drilling revenue |  |  | $ 900 | $ 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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