Other Intangible Assets Textuals (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 4.1
Amortization expense related to finite-lived intangible assets		$ 20.1	$ 14.0	$ 11.1
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average period (in years)		12 years 8 months 12 days
Proprietary technology [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average period (in years)		13 years 7 months 6 days
Patents and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average period (in years)		9 years 3 months 18 days
Control Technologies [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)			$ 1.8