Supplemental Financial Information - Accrued Liabilities (Detail) - USD ($) $ in Thousands		Jun. 30, 2022	Dec. 31, 2021
Payables and Accruals [Abstract]
Rig operating costs		$ 40,250	$ 42,532
Payroll and benefits		32,074	29,268
Deferred revenue	[1]	22,442	38,506
Current operating lease liability		16,121	15,998
Contract advances		15,699,000
Personal injury and other claims		4,776	5,598
Shorebase and administrative costs		6,729	5,776
Accrued capital project/upgrade costs		2,234	2,219
Interest payable		2,462	2,986
Other		2,943	853
Change in accrued liabilities		$ 145,730	$ 143,736

[1] Contract assets and contract liabilities may reflect balances which have been netted together on a contract basis. Net current contract asset and liability balances are included in “Prepaid expenses and other current assets” and “Accrued liabilities,” respectively, and net noncurrent contract liability balances are included in “Other liabilities” in our unaudited Condensed Consolidated Balance Sheets.