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Investments - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
MXN / $
Jun. 30, 2014
USD ($)
MXN / $
Jun. 30, 2015
USD ($)
MXN / $
Jun. 30, 2014
USD ($)
MXN / $
Dec. 31, 2014
USD ($)
MXN / $
Schedule of Equity Method Investments [Line Items]          
Equity in earnings (losses), net of taxes $ 2,000 $ 41,000 $ 290,000 $ (167,000)  
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 / $ 15.68   15.68   14.74
Increase (decrease) in equity method investment     $ (800,000) 600,000  
Equity in earnings (losses), net of taxes $ 2,000.0 $ 300,000 300,000 $ 300,000  
Equity in earnings (losses), deferred taxes 600,000   600,000    
Fair value of investment 31,500,000   31,500,000   $ 30,800,000
Carrying value of investment 26,300,000   26,300,000   27,800,000
Grupo Vasconia S.A.B. | Prepaid expenses and other current assets          
Schedule of Equity Method Investments [Line Items]          
Due from related party         33,000
Grupo Vasconia S.A.B. | Accrued expense          
Schedule of Equity Method Investments [Line Items]          
Due to related party $ 35,000   $ 35,000    
Grupo Vasconia S.A.B. | Transaction 02          
Schedule of Equity Method Investments [Line Items]          
Average daily exchange rate for period - MXN to USD | MXN / $ 15.31 12.99      
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 / $     15.13 13.00  
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 / $     15.19 13.10  
GS Internacional S/A          
Schedule of Equity Method Investments [Line Items]          
Percentage of ownership in equity method investment 40.00%   40.00%    
Equity in earnings (losses), net of taxes   $ 234,000   $ 447,000  
Carrying value of investment $ 0   $ 0   $ 0