Supplemental Financial Information - Accrued Liabilities (Detail) - USD ($) $ in Thousands		Jun. 30, 2023	Dec. 31, 2022
Payables and Accruals [Abstract]
Contract advances		$ 50,199	$ 52,743
Rig operating costs		42,686	39,288
Payroll and benefits		30,483	29,408
Accrued capital project/upgrade costs		12,209	8,419
Deferred revenue	[1]	9,293	11,513
Current operating lease liability		7,161	13,480
Personal injury and other claims		5,393	3,738
Shorebase and administrative costs		5,030	4,365
Interest payable		1,812	1,897
Deposit for equipment sale		1,788	1,670
Other		989	264
Change in accrued liabilities		$ 167,043	$ 166,785

[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.