Goodwill and Other Intangible Assets, Net - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Line Items]
Amortization expense	$ 13.2	$ 13.2	$ 13.5
Expected amortization expense in 2017	13.2
Expected amortization expense in 2018	13.2
Expected amortization expense in 2019	13.1
Expected amortization expense in 2020	12.5
Expected amortization expense in 2021	$ 11.1