Supplemental Financial Information - Accrued Liabilities (Detail) - USD ($) $ in Thousands		Sep. 30, 2023	Dec. 31, 2022
Payables and Accruals [Abstract]
Contract advances		$ 52,414	$ 52,743
Rig operating costs		36,692	39,288
Payroll and benefits		33,211	29,408
Accrued capital project/upgrade costs		13,764	8,419
Personal injury and other claims		6,198	3,738
Shorebase and administrative costs		5,457	4,365
Current operating lease liability		4,905	13,480
Deferred revenue	[1]	4,888	11,513
Interest payable		1,334	1,897
Deposit for equipment sale		1,207	1,670
Other		3,342	264
Change in accrued liabilities		$ 163,412	$ 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.