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Income Taxes - Components of Net Deferred Tax Liability (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]    
Inventories $ 507 $ 538
Property and equipment (4,468) (4,650)
Accrued liabilities and other deductible differences 110 45
Accrued employee benefits 1,592 1,695
Other deductible differences 4 4
Goodwill (2,625) (2,625)
Other taxable differences (7) (8)
Total deferred tax liability $ (4,887) $ (5,001)