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Basis of Presentation and Summary Accounting Policies - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Significant Accounting Policies [Line Items]        
Percentage of total annual net sales in the third and fourth quarters     58.00% 59.00%
Shipping and handling revenue $ 441,000 $ 353,000    
Derivative fair value adjustment, net of tax 13,000      
Fair Value, Observable inputs, Level Two
       
Schedule Of Significant Accounting Policies [Line Items]        
Fair value of derivative instruments, liability 432,000      
Interest Rate Swap Agreements
       
Schedule Of Significant Accounting Policies [Line Items]        
Notional amount 35,000,000      
Commencement date 2013-03      
Expiry date Jun. 30, 2018      
Derivative fair value adjustment, net of tax $ 13,000