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Anti Dilutive Securities Not Included in Computation of Diluted EPS (Detail) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Earnings Per Share [Abstract]    
Antidilutive stock options excluded from diluted shares 1,555,015 3,794,002
Weighted average price of these options $ 58.97 $ 62.18