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Revenues - Additional Information (Detail) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Disaggregation Of Revenue [Line Items] |  |
Accounts receivable balances | $ 602,748,000 | $ 580,354,000
ASC Topic 606 Revenue from Contracts with Customers |  |
Disaggregation Of Revenue [Line Items] |  |
Accounts receivable balances | 598,000,000 | 577,000,000
ASC Topic 606 Revenue from Contracts with Customers | Contract Drilling |  |
Disaggregation Of Revenue [Line Items] |  |
Increase (decrease) in contract liabilities | (802,000) |
ASC Topic 606 Revenue from Contracts with Customers | Customer Payments |  |
Disaggregation Of Revenue [Line Items] |  |
Increase (decrease) in contract liabilities | 669,000 |
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 | 2,200,000 | 9,100,000
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 | $ 4,600,000 | $ 4,700,000
Maximum |  |
Disaggregation Of Revenue [Line Items] |  |
Accounts receivable payment terms | 60 days |
Performance obligation original expected duration | 1 year |
Minimum |  |
Disaggregation Of Revenue [Line Items] |  |
Accounts receivable payment terms | 30 days |

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