Goodwill and Identifiable Intangible Assets - Narrative (Detail) $ in Millions		12 Months Ended
	Oct. 01, 2016 report_unit	Dec. 31, 2016 USD ($) reporting_unit	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Finite-Lived Intangible Assets [Line Items]
Number of reporting units	4	5
Amortization expense		$ 7.2	$ 5.0	$ 3.6