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Revenues - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Accounts receivable balances	$ 131,329		$ 131,329		$ 339,699
Amount amortized and recorded in drilling revenue	207,141	$ 598,452	903,448	$ 1,978,388
Contract Drilling
Disaggregation Of Revenue [Line Items]
Amount amortized and recorded in drilling revenue	115,054	$ 317,035	553,552	1,037,565
ASC Topic 606 Revenue from Contracts with Customers
Disaggregation Of Revenue [Line Items]
Accounts receivable balances	129,000		129,000		336,000
ASC Topic 606 Revenue from Contracts with Customers | Accounts Payable
Disaggregation Of Revenue [Line Items]
Total contract liability	$ 600		600		$ 2,700
ASC Topic 606 Revenue from Contracts with Customers | Contract Drilling
Disaggregation Of Revenue [Line Items]
Amount amortized and recorded in drilling revenue			$ 100	$ 900
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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