Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense for finite-lived intangible asset	$ 66.5	$ 68.5	$ 61.0
Finite lived intangible assets life	20 years
Change in estimated intangible assets value		$ 1.9