Basis of Presentation and Summary Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 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	$ 266,000	$ 281,000	$ 918,000	$ 868,000
Derivative fair value adjustment, net of tax	(48,000)	(258,000)	196,000	(258,000)
Restructuring expenses	79,000		367,000
Fair Value, Observable inputs, Level Two
Schedule Of Significant Accounting Policies [Line Items]
Fair value of derivative instruments, liability	127,000		127,000
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	48,000		196,000
Interest Rate Swap Agreements | Cash Flow Hedging
Schedule Of Significant Accounting Policies [Line Items]
Notional amount	$ 30,600,000		$ 30,600,000