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Goodwill and Intangible Assets - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Goodwill And Intangible Assets Disclosure [Abstract]        
Amortization expense of finite life intangible assets $ 2,017 $ 80 $ 3,590 $ 252
Amortization expense of finite life intangibles for 2013 2,482   2,482  
Amortization expense of finite life intangibles for 2014 7,017   7,017  
Amortization expense of finite life intangibles for 2015 7,059   7,059  
Amortization expense of finite life intangibles for 2016 6,067   6,067  
Amortization expense of finite life intangibles for 2017 $ 5,139   $ 5,139