Other Intangible Assets Textuals (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization expense related to finite-lived intangible assets	$ 17.6	$ 18.9	$ 20.1
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average period (in years)	12 years 4 months 24 days
Proprietary technology [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average period (in years)	13 years 1 month 6 days
Patents and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average period (in years)	10 years