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Significant Components of Net Deferred Income Tax Asset (Liability) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred income tax liabilities:    
Depreciation and amortization   $ (1,268)
Intangibles $ (8,732) (9,815)
Equity in earnings (56) 24
Total deferred income tax liabilities (8,788) (11,059)
Net deferred income tax asset 4,427 5,189
Valuation allowance (3,024) (2,396)
Net deferred income tax asset $ 1,403 $ 2,793