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Investments - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
MXN / $
Jun. 30, 2016
USD ($)
MXN / $
Jun. 30, 2017
USD ($)
MXN / $
Jun. 30, 2016
USD ($)
MXN / $
Dec. 31, 2016
USD ($)
MXN / $
Schedule of Equity Method Investments [Line Items]          
Equity in earnings (losses), net of taxes $ 458,000 $ 18,000 $ 998,000 $ (132,000)  
Grupo Vasconia S.A.B.          
Schedule of Equity Method Investments [Line Items]          
Percentage of ownership in equity method investment 30.00%   30.00%    
Exchange rate at period end - MXN to USD | MXN / $ 18.05   18.05   20.70
Increase decrease in equity method investment     $ 1,800,000 (1,700,000)  
Equity in earnings (losses), net of taxes $ 458,000 171,000 998,000 321,000  
Equity in earnings (losses), deferred taxes benefits (expenses) 100,000 $ 300,000 400,000 $ 500,000  
Fair value of investment 34,000,000   34,000,000   $ 29,000,000
Carrying value of investment 24,900,000   24,900,000   22,500,000
Grupo Vasconia S.A.B. | Prepaid expenses and other current assets          
Schedule of Equity Method Investments [Line Items]          
Due from related party 85,000   85,000   83,000
Grupo Vasconia S.A.B. | Accounts payable and accrued expenses          
Schedule of Equity Method Investments [Line Items]          
Due to related party $ 24,000   $ 24,000   $ 220,000
Grupo Vasconia S.A.B. | Transaction 02          
Schedule of Equity Method Investments [Line Items]          
Average daily exchange rate for period - MXN to USD | MXN / $ 18.54 18.09      
Grupo Vasconia S.A.B. | Transaction 02 | Minimum          
Schedule of Equity Method Investments [Line Items]          
Average daily exchange rate for period - MXN to USD | MXN / $     18.54 18.06  
Grupo Vasconia S.A.B. | Transaction 02 | Maximum          
Schedule of Equity Method Investments [Line Items]          
Average daily exchange rate for period - MXN to USD | MXN / $     20.30 18.07