Intangible Assets, Net and Goodwill - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense on intangible assets	$ 19.2	$ 8.3	$ 58.8	$ 25.9