Drilling and Other Property and Equipment - Summary of Cost and Accumulated Depreciation of Drilling and Other Property and Equipment (Detail) - USD ($) $ in Thousands		Dec. 31, 2021	Apr. 23, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment		$ 1,244,397		$ 7,111,718
Less: accumulated depreciation		(68,502)		(2,988,909)
Drilling and other property and equipment, net		1,175,895	$ 1,354,650	4,122,809
Drilling Rigs and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment		1,057,739		6,987,631
Finance Lease Right of Use Asset [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	[1]	174,571
Land and Buildings [Member]
Property, Plant and Equipment [Line Items]
Property and equipment		9,823		41,072
Office Equipment and Other [Member]
Property, Plant and Equipment [Line Items]
Property and equipment		$ 2,264		$ 83,015

[1] Due to an amendment on the Effective Date, our BOP leases were recharacterized from operating to finance leases. See Note 3 "Fresh Start Accounting" and Note 13 "Leases and Lease Commitments."