Supplemental Financial Information - Accrued Liabilities (Detail) - USD ($) $ in Thousands		Jun. 30, 2024	Dec. 31, 2023
Payables and Accruals [Abstract]
Rig operating costs		$ 47,364	$ 42,893
Contract advances		31,687	63,618
Payroll and benefits		29,972	35,215
Deferred revenue	[1]	18,592	12,634
Interest payable		11,700	13,013
Current operating lease liability		7,958	8,436
Accrued capital project/upgrade costs		6,221	10,766
Personal injury and other claims		5,487	7,391
Shorebase and administrative costs		4,890	5,699
Deposit for equipment sale		580	1,977
Other		276	1,694
Total		$ 164,727	$ 203,336

[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.