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Revenues - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Accounts receivable balances	$ 501,206		$ 501,206		$ 558,817
Amount amortized and recorded in drilling revenue	675,765	$ 854,418	1,379,936	$ 1,663,582
Contract Drilling
Disaggregation Of Revenue [Line Items]
Amount amortized and recorded in drilling revenue	348,138	$ 349,922	720,530	677,725
ASC Topic 606 Revenue from Contracts with Customers
Disaggregation Of Revenue [Line Items]
Accounts receivable balances	497,000		497,000		554,000
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	4,000		4,000		3,000
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	$ 3,900		3,900		$ 4,600
ASC Topic 606 Revenue from Contracts with Customers | Contract Drilling
Disaggregation Of Revenue [Line Items]
Amount amortized and recorded in drilling revenue			$ 800	$ 800
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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