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Goodwill and Intangible Assets, Net - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Jun. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]            
Goodwill $ 51,889,000     $ 51,889,000   $ 51,889,000
Goodwill, Impairment Loss     $ 0     $ 0
Weighted average remaining useful life       3 years 7 months 6 days    
Amortization of intangible assets $ 400,000 $ 400,000   $ 1,200,000 $ 1,200,000