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Income Taxes - Significant Components of Deferred Income Tax Assets and Liabilities Classified (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Deferred income taxes, current $ 1,744 $ 5,214
Deferred income taxes, non-current (6,165) (23,576)
Net deferred tax liability $ (4,421) $ (18,362)