Supplemental Financial Information - Accrued Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Payables And Accruals [Abstract]
Accrued capital project/upgrade costs	$ 39,169	$ 37,379
Payroll and benefits	38,370	47,564
Interest payable	36,813	28,234
Rig operating expenses	35,422	42,323
Current operating lease liability	19,143
Personal injury and other claims	6,790	5,544
Deferred revenue	6,056	2,803
Shorebase and administrative costs	4,871	6,217
Other	3,570	2,164
Total	$ 190,204	$ 172,228