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Goodwill and Amortizable Intangible Assets - Estimated Amortization of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]    
For the remaining six months ending December 31, 2013 $ 1,216  
2014 4,866  
2015 3,588  
2016 3,013  
2017 2,880  
Thereafter 11,021  
Total amortizable intangible assets $ 26,584 $ 30,333