General Information - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Restricted Cash And Cash Equivalents Items [Line Items]
Restricted cash	$ 27,747	$ 24,511
Restricted cash, nature of restriction, description	We maintain restricted cash bank accounts, of which $21.7 million is subject to restrictions pursuant to a court order, to settle certain professional fees incurred upon or prior to our emergence from bankruptcy, and $6.0 million is subject to restrictions pursuant to a management and marketing services agreement with an offshore drilling company.
Professional Fees [Member]
Restricted Cash And Cash Equivalents Items [Line Items]
Restricted cash	$ 21,700
Management and Marketing Services Agreement [Member]
Restricted Cash And Cash Equivalents Items [Line Items]
Restricted cash	$ 6,000