Other Liabilities Accrued and other liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule Other Liabilities [Line Items]
Accrued and other liabilities	$ 8,458	$ 8,916
Tax-related
Schedule Other Liabilities [Line Items]
Accrued and other liabilities	146	238
Accrued compensation and related taxes
Schedule Other Liabilities [Line Items]
Accrued and other liabilities	2,472	5,471
Deferred compensation
Schedule Other Liabilities [Line Items]
Accrued and other liabilities	3,546	0
Deferred revenue
Schedule Other Liabilities [Line Items]
Accrued and other liabilities	1,510	1,308
Professional services
Schedule Other Liabilities [Line Items]
Accrued and other liabilities	156	763
Accrued fuel and rig-related charges
Schedule Other Liabilities [Line Items]
Accrued and other liabilities	107	601
Other
Schedule Other Liabilities [Line Items]
Accrued and other liabilities	$ 521	$ 535