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Basis of Presentation and Summary Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 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 $ 360,000 $ 234,000 $ 809,000 $ 587,000    
Derivative fair value adjustment, net of tax 231,000   244,000      
Restructuring Expenses 288,000   288,000      
Fair Value, Observable inputs, Level Two
            
Schedule Of Significant Accounting Policies [Line Items]            
Fair value of derivative instruments, liability 47,000   47,000      
Interest Rate Swap Agreements
            
Schedule Of Significant Accounting Policies [Line Items]            
Commencement date     2013-03      
Expiry date     Jun. 30, 2018      
Derivative fair value adjustment, net of tax 231,000   244,000      
Interest Rate Swap Agreements | Cash Flow Hedging
            
Schedule Of Significant Accounting Policies [Line Items]            
Notional amount $ 31,500,000   $ 31,500,000