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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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