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Goodwill and Amortizable Intangible Assets - Estimated Amortization of Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]    
For the year ending December 31: $ 1,120  
2016 4,160  
2017 2,886  
2018 2,500  
2019 2,500  
Thereafter 2,917  
Total amortizable intangible assets $ 16,083 $ 19,698