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Goodwill and Intangible Assets, Net - Estimated Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]    
For the remainder of 2013 $ 7,639  
2014 18,903  
2015 14,938  
2016 11,710  
2017 10,469  
2018 9,373  
Thereafter 57,013  
Net Carrying Amount $ 130,045 $ 144,492