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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)

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