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Intangibles, Net - Future Amortization Expense of Intangible Assets (Detail) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]    
Remainder of 2013 $ 975,000  
2014 3,369,000  
2015 2,801,000  
2016 2,416,000  
2017 1,272,000  
2018 and thereafter 3,600,000  
Total future amortization expense $ 14,433,000 $ 17,357,000