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Income Taxes - Components of Net Deferred Tax Liability (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Inventories $ 356 $ 347
Property and equipment (2,912) (2,796)
Accrued liabilities and other deductible differences 25 23
Accrued employee benefits 1,032 1,009
Goodwill (1,693) (1,691)
Other taxable differences (6) (4)
Total deferred tax liability $ (3,198) $ (3,112)