Supplemental Financial Information - Accrued Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Payables And Accruals [Abstract]
Deferred revenue	$ 57,185	$ 51,763
Accrued interest	35,329
Payroll and benefits	33,216	30,296
Shorebase and administrative costs	23,547	17,275
Current operating lease liability	22,548	5,072
Rig operating costs	20,673	21,123
Accrued capital project/upgrade costs	17,255	7,075
Deferred debt issuance costs and financing fees	10,140
Accrued backstop commitment premium	9,900
Personal injury and other claims	5,346	6,495
Other	1,510	1,689
Total	$ 236,649	$ 140,788