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Intangible Assets, Net - 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 $ 717  
2014 2,688  
2015 2,578  
2016 2,577  
2017 2,557  
Thereafter 6,682  
Net $ 17,799 $ 20,240