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Goodwill and Intangible Assets - Expected Amortization Expense for Acquisition-Related Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]    
Remainder of 2013 $ 34  
2014 135  
2015 135  
2016 130  
2017 98  
Thereafter 365  
Total / Net Carrying Value $ 897 $ 1,069