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Investments - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]          
Equity in earnings (losses), net of taxes $ 92,000 $ 523,000 $ 338,000 $ 921,000  
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 13.00   13.00   12.97
Increase (Decrease) in equity method investment     (100,000) 200,000  
Due from related party 63,000   63,000   71,000
Cash dividend received 571,000   571,000    
Equity in earnings (losses), net of taxes 400,000 600,000 600,000 1,100,000  
Grupo Vasconia S.A.B. | Transaction 01
         
Schedule of Equity Method Investments [Line Items]          
Average daily exchange rate for period - MXN to USD 12.46 13.51      
Grupo Vasconia S.A.B. | Transaction 02 | Minimum
         
Schedule of Equity Method Investments [Line Items]          
Average daily exchange rate for period - MXN to USD     12.57 13.24  
Grupo Vasconia S.A.B. | Transaction 02 | Maximum
         
Schedule of Equity Method Investments [Line Items]          
Average daily exchange rate for period - MXN to USD     12.79 13.29  
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 $ 243,000 $ 39,000 $ 266,000 $ 172,000