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Significant Components of Net Deferred Income Tax Asset (Liability) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred income tax liabilities:    
Depreciation and amortization $ (1,268) $ (3,121)
Intangibles (9,815) (12,380)
Equity in earnings 24 (154)
Total deferred income tax liabilities (11,059) (15,655)
Net deferred income tax asset (liability) 5,189 (33)
Valuation allowance (2,396) (2,077)
Net deferred income tax liability   $ (2,110)
Net deferred income tax asset $ 2,793