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Income Taxes - Significant Components of Deferred Income Tax Assets and Liabilities Classified (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]    
Deferred income taxes, current $ 6,448 $ 6,149
Deferred income taxes, non-current (21,303) (15,974)
Net deferred tax liability $ (14,855) $ (9,825)