XML 73 R58.htm IDEA: XBRL DOCUMENT v3.8.0.1
Income Taxes - Significant Components of Deferred Income Tax Assets and Liabilities Classified (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Deferred income taxes, current $ 5,214 $ 7,814
Deferred income taxes, non-current (23,576) (31,522)
Net deferred tax liability $ (18,362) $ (23,708)