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Income Taxes - Components of Net Deferred Tax Liability (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]    
Inventories $ 538 $ 835
Property and equipment (4,650) (4,706)
Accrued liabilities and other deductible differences 45 46
Accrued employee benefits 1,695 1,577
Other deductible differences 4 4
Goodwill (2,625) (2,625)
Other taxable differences (8) (7)
Total deferred tax liability $ (5,001) $ (4,876)