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Revenues - Additional Information (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Disaggregation Of Revenue [Line Items] |  |  |
Accounts receivable balances | $ 547,993,000 |  | $ 558,817,000
Amount amortized and recorded in drilling revenue | 704,171,000 | $ 809,164,000 |
Contract Drilling |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Amount amortized and recorded in drilling revenue | 372,392,000 | 327,803,000 |
ASC Topic 606 Revenue from Contracts with Customers |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Accounts receivable balances | 544,000,000 |  | 554,000,000
ASC Topic 606 Revenue from Contracts with Customers | Customer Prepayments |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Contract liability balances included in accounts payable and accrued liabilities | 6,800,000 |  | 3,000,000
ASC Topic 606 Revenue from Contracts with Customers | Deferred Mobilization Payments |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Contract liability balances included in accounts payable and accrued liabilities | 4,200,000 |  | $ 4,600,000
ASC Topic 606 Revenue from Contracts with Customers | Contract Drilling |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Amount amortized and recorded in drilling revenue | $ 402,000 | $ 405,000 |
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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