General Information - Additional Information (Detail) $ in Thousands	1 Months Ended	4 Months Ended	8 Months Ended	12 Months Ended
	Feb. 28, 2022 USD ($)	Apr. 23, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) Rig	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Significant Accounting Policies [Line Items]
Number of offshore rigs owned | Rig				12
Survey Costs			$ 900
Net book value of assets			1,175,895	$ 1,175,895	$ 4,122,809	$ 5,152,828
Gain (loss) on disposition of assets		$ 5,486	1,024		7,375	$ (1,072)
Period considered to treat short-term, highly liquidity investments as cash equivalents				three months or less
Amount capitalized for asset replacements and betterments		59,900	22,000		$ 137,400
Minimum [Member]
Significant Accounting Policies [Line Items]
Deferral and amortization costs incurred period				2 years 6 months
Estimated useful life for drilling rigs and equipment				3 years
Maximum [Member]
Significant Accounting Policies [Line Items]
Deferral and amortization costs incurred period				5 years
Estimated useful life for drilling rigs and equipment				30 years
Contract Drilling [Member]
Significant Accounting Policies [Line Items]
Amortized deferred survey costs			200
Prepaid Expenses and Other Current Assets [Member]
Significant Accounting Policies [Line Items]
Survey Costs			500
Other Assets [Member]
Significant Accounting Policies [Line Items]
Survey Costs			200
Ultra-deepwater Drillship [Member]
Significant Accounting Policies [Line Items]
Number of offshore rigs owned | Rig				4
Semisubmersible Rigs [Member]
Significant Accounting Policies [Line Items]
Number of offshore rigs owned | Rig				8
Ocean Valor [Member]
Significant Accounting Policies [Line Items]
Net book value of assets			$ 1,000	$ 1,000
Ocean America and Ocean Rover [Member]
Significant Accounting Policies [Line Items]
Gain (loss) on disposition of assets		$ 4,400
Ocean America and Ocean Rover [Member] | Subsequent Event [Member]
Significant Accounting Policies [Line Items]
Gain (loss) on disposition of assets	$ 5,500