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Investments - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]          
Equity in earnings (losses), net of taxes $ (5,451,000) $ 695,000 $ (5,113,000) $ 1,616,000  
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 13.15   13.15   12.97
Increase (Decrease) in equity method investment     500,000 1,200,000  
Due from related party 73,000   73,000   71,000
Due to related party 98,000   98,000    
Equity in earnings (losses), net of taxes 5,300,000 800,000 (4,700,000) 1,900,000  
Decrease in equity method investment to fair value 5,000,000        
Carrying value of equity method investment 29,500,000   29,500,000    
Grupo Vasconia S.A.B. | Transaction 01
         
Schedule of Equity Method Investments [Line Items]          
Average daily exchange rate for period - MXN to USD 12.90 13.15      
Grupo Vasconia S.A.B. | Transaction 02 | Minimum
         
Schedule of Equity Method Investments [Line Items]          
Average daily exchange rate for period - MXN to USD     12.41 13.21  
Grupo Vasconia S.A.B. | Transaction 02 | Maximum
         
Schedule of Equity Method Investments [Line Items]          
Average daily exchange rate for period - MXN to USD     12.77 13.24  
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 $ 132,000 $ 45,000 $ 398,000 $ 217,000