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Amortization expense (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Amortization Expense [Line Items]      
Amortization Expense $ 428,000 $ 572,000 $ 456,000
Customer lists
      
Amortization Expense [Line Items]      
Amortization Expense 29,000 78,000 78,000
Trademarks, patents and copyrights
      
Amortization Expense [Line Items]      
Amortization Expense $ 399,000 $ 494,000 $ 378,000