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Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Significant Accounting Policies [Line Items]      
Foreign currency gain/loss $ (415,000) $ 28,000 $ 62,000
Shipping and handling revenue 1,400,000 1,400,000 1,900,000
Freight-out expenses 8,500,000 7,500,000 8,200,000
Advertising expenses $ 775,000 $ 702,000 $ 775,000
Wal Mart Stores Inc
      
Schedule Of Significant Accounting Policies [Line Items]      
Percentage of revenue from single customer 16.00% 15.00% 15.00%
Maximum
      
Schedule Of Significant Accounting Policies [Line Items]      
Highly liquid instruments which are considered cash and cash equivalent, maturity period 3 months    
Building And Improvement | Minimum
      
Schedule Of Significant Accounting Policies [Line Items]      
Property and equipment depreciated over estimated useful lives 30 years    
Machinery, Furniture and Equipment | Minimum
      
Schedule Of Significant Accounting Policies [Line Items]      
Property and equipment depreciated over estimated useful lives 3 years    
Machinery, Furniture and Equipment | Maximum
      
Schedule Of Significant Accounting Policies [Line Items]      
Property and equipment depreciated over estimated useful lives 10 years