Stock-Based Compensation Plans (Weighted Average Assumptions Used To Determine The Options Fair Value) (Detail)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation [Abstract]
Expected dividend yield	0.90%	0.40%
Expected volatility	26.50%	30.80%
Risk-free rate	1.30%	0.70%
Expected option life (in years)	4 years 6 months	4 years 6 months