Supplemental Financial Information - Accrued Liabilities (Detail) - USD ($) $ in Thousands		Mar. 31, 2022	Dec. 31, 2021
Payables And Accruals [Abstract]
Rig operating costs		$ 43,536	$ 42,532
Payroll and benefits		29,141	29,268
Deferred revenue	[1]	27,682	38,506
Current operating lease liability		13,417	15,998
Personal injury and other claims		6,466	5,598
Shorebase and administrative costs		6,262	5,776
Accrued capital project/upgrade costs		5,555	2,219
Interest payable		4,465	2,986
Other		989	853
Change in accrued liabilities		$ 137,513	$ 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.