Supplemental Financial Information - Accrued Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Payables And Accruals [Abstract]
Deferred revenue	$ 56,404	$ 9,573
Payroll and benefits	29,330	42,494
Shorebase and administrative costs	25,126	5,275
Rig operating expenses	15,536	37,969
Accrued capital project/upgrade costs	10,069	56,603
Personal injury and other claims	6,363	7,074
Current operating lease liability	619	20,030
Interest payable		28,234
Other	2,010	3,528
Total	$ 145,457	$ 210,780