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Goodwill and Intangible Assets, Net - Summary of Estimated Future Amortization Expense Related to Intangible Assets with Definite Lives (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]    
2013 (remaining three months) $ 1,462  
2014 4,631  
2015 2,713  
2016 2,213  
2017 2,052  
2018 2,052  
2019 and thereafter 5,584  
Intangible assets with definite lives, net $ 20,707 $ 7,890