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Basis of Presentation and Summary Accounting Policies - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Sep. 30, 2012
Fair Value, Observable inputs, Level Two
Aug. 20, 2012
Interest Rate Swap Agreements
Sep. 30, 2012
Interest Rate Swap Agreements
Sep. 30, 2012
Interest Rate Swap Agreements
Schedule Of Significant Accounting Policies [Line Items]                    
Percentage of total annual net sales in the third and fourth quarters         59.00% 60.00%        
Shipping and handling revenue $ 281,000 $ 254,000 $ 868,000 $ 983,000            
Notional amount               35,000,000    
Commencement date               2013-03    
Expiry date               2018-06    
Derivative fair value adjustment, net of tax (258,000)   (258,000)           (258,000) (258,000)
Fair value of derivative instruments, liability             $ 430,000