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Income Taxes - Components of Net Deferred Tax Liability (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Inventories $ 347 $ 507
Property and equipment (2,796) (4,468)
Accrued liabilities and other deductible differences 23 114
Accrued employee benefits 1,009 1,592
Goodwill (1,691) (2,625)
Other taxable differences (4) (7)
Total deferred tax liability $ (3,112) $ (4,887)