Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense for finite-lived intangible asset	$ 68,500,000	$ 61,000,000	$ 53,300,000
Finite lived intangible assets life	20 years
Change in estimated intangible assets value	$ 1,900,000
Finite-Lived Intangible Assets Acquired	$ 271,923,000		$ 0