Supplemental Financial Information - Accrued Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Rig operating expenses	$ 35,612	$ 33,732
Payroll and benefits	42,275	45,619
Deferred revenue	8,911	9,522
Accrued capital project/upgrade costs	3,338	60,308
Interest payable	36,813	18,365
Personal injury and other claims	5,160	6,424
Other	8,124	8,189
Total	$ 140,233	$ 182,159