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Assumptions Used To Estimate Fair Value of Stock Option Grants (Detail) (Stock Options, USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock Options
     
Share Based Compensation [Line Items]      
Dividend yield 0.70% 0.80% 0.80%
Risk-free interest rate 1.60% 0.90% 1.03%
Expected option life in years 6 years 6 months 7 years 7 years
Expected volatility 21.00% 21.00% 23.00%
Option fair value $ 29.83 $ 20.22 $ 19.82