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Goodwill and Other Intangible Assets - Estimated Aggregate Future Amortization Expense for Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2013 $ 727  
2014 2,271  
2015 1,489  
2016 777  
2017 215  
Thereafter 280  
Future Amortization Expense, Total $ 5,759 $ 8,147