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Goodwill and Amortizable Intangible Assets - Estimated Amortization of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]    
For the remaining three months ending December 31, 2014 $ 1,503  
2015 4,735  
2016 4,160  
2017 2,886  
2018 2,500  
Thereafter 5,417  
Total amortizable intangible assets $ 21,201 $ 25,368