Supplemental Financial Information - Accrued Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Payables And Accruals [Abstract]
Deferred revenue	$ 45,389	$ 9,573
Payroll and benefits	31,652	42,494
Shorebase and administrative costs	19,890	5,275
Rig operating expenses	17,355	37,969
Personal injury and other claims	6,210	7,074
Accrued capital project/upgrade costs	4,772	56,603
Current operating lease liability	620	20,030
Interest payable		28,234
Other	1,628	3,528
Total	$ 127,516	$ 210,780