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Intangible Assets and Related Amortization (Detail) (USD $)
6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 2,672,000 $ 2,675,000
Accumulated Amortization 1,931,000 1,672,000
Customer Lists
   
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 235,000 235,000
Accumulated Amortization 168,000 128,000
Weighted-Avg. Amortization Period 3 years  
Trademarks, Patents and Copyrights
   
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 2,437,000 2,440,000
Accumulated Amortization $ 1,763,000 $ 1,544,000
Weighted-Avg. Amortization Period 4 years