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Amortization expense (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Expected Amortization Expense [Line Items]        
Amortization expense $ 118,000 $ 152,000 $ 379,000 $ 411,000
Customer lists
        
Expected Amortization Expense [Line Items]        
Amortization expense 7,000 20,000 22,000 60,000
Trademarks, patents and copyrights
        
Expected Amortization Expense [Line Items]        
Amortization expense $ 111,000 $ 132,000 $ 357,000 $ 351,000