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Income Tax - Components of Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Current $ (2,646) $ (5,212) $ (1,482)
Deferred (76) (2,355) (3,674)
Income tax expense $ (2,722) $ (7,567) $ (5,156)