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Revenues - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Accounts receivable balances | $ 196,654,000 |  | $ 196,654,000 |  |  | $ 160,214,000
Revenue | 291,774,000 | $ 250,380,000 | 532,703,000 |  | $ 696,307,000 |
ASC Topic 606 Revenue from Contracts with Customers |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Accounts receivable balances | 194,000,000 |  | 194,000,000 |  |  | 158,000,000
Revenue |  |  | 2,300,000 |  | 0 |
ASC Topic 606 Revenue from Contracts with Customers | Accounts Payable |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total contract liability | $ 500,000 |  | 500,000 |  |  | $ 600,000
ASC Topic 606 Revenue from Contracts with Customers | Contract Drilling |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Amortized revenue |  |  | $ 0 | [1] | $ 100,000 |
Maximum |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Accounts receivable payment terms |  |  | 60 days |  |  |
Minimum |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Accounts receivable payment terms |  |  | 30 days |  |  |
[1] | no

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