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Investments - Additional Information (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
$ / $
Sep. 30, 2017
USD ($)
$ / $
Sep. 30, 2018
USD ($)
$ / $
Sep. 30, 2017
USD ($)
$ / $
Dec. 31, 2017
USD ($)
$ / $
Schedule of Equity Method Investments [Line Items]          
Equity in earnings (losses), net of taxes $ 185,000 $ (326,000) $ 417,000 $ 672,000  
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 | $ / $ 18.69   18.69   19.68
Increase (decrease) in equity method investment     $ 800,000 1,300,000  
Due to related party $ 0   0   $ 0
Equity in earnings (losses), net of taxes 185,000 (326,000) 417,000 672,000  
Equity in earnings, deferred taxes (580,000) $ 100,000 (274,000) $ (200,000)  
Fair value of investment 32,800,000   32,800,000   31,800,000
Carrying value of investment 24,800,000   24,800,000   23,800,000
Grupo Vasconia S.A.B. | Prepaid expenses and other current assets          
Schedule of Equity Method Investments [Line Items]          
Due from related party $ 147,000   $ 147,000   $ 64,000
Grupo Vasconia S.A.B. | Transaction 02          
Schedule of Equity Method Investments [Line Items]          
Average daily exchange rate for period - MXN to USD | $ / $ 18.94 17.81      
Grupo Vasconia S.A.B. | Minimum | Transaction 02          
Schedule of Equity Method Investments [Line Items]          
Average daily exchange rate for period - MXN to USD | $ / $     18.71 17.81  
Grupo Vasconia S.A.B. | Maximum | Transaction 02          
Schedule of Equity Method Investments [Line Items]          
Average daily exchange rate for period - MXN to USD | $ / $     19.38 20.30