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Schedule of Weighted Average Remaining Contractual Life for Options Outstanding and Weighted Average Exercise Price Per Share for Exercisable Options (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Options Outstanding, Shares 7,620,958 7,436,238 7,558,945 6,594,950
Options Outstanding, Weighted Average Exercise Price Per Share $ 43.63 $ 36.31 $ 31.63 $ 25.16
Options Outstanding, Weighted Average Remaining Contractual Life (in Years) 2 years 10 months 24 days      
Exercisable Options, Shares 1,756,128      
Weighted average exercise price per share, Options Exercisable $ 35.60      
Expected to Vest Options , Shares 5,233,188 [1]      
Expected to Vest Options, Weighted Average Exercise Price Per Share $ 46.04 [1]      
Range One
        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Range, Low $ 30.32      
Range, High $ 36.95      
Options Outstanding, Shares 3,183,583      
Options Outstanding, Weighted Average Exercise Price Per Share $ 35.14      
Options Outstanding, Weighted Average Remaining Contractual Life (in Years) 2 years 4 months 24 days      
Exercisable Options, Shares 1,259,453      
Weighted average exercise price per share, Options Exercisable $ 32.45      
Expected to Vest Options , Shares 1,716,901 [1]      
Expected to Vest Options, Weighted Average Exercise Price Per Share $ 36.91 [1]      
Range Two
        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Range, Low $ 38.12      
Range, High $ 43.67      
Options Outstanding, Shares 1,685,350      
Options Outstanding, Weighted Average Exercise Price Per Share $ 43.56      
Options Outstanding, Weighted Average Remaining Contractual Life (in Years) 2 years 1 month 6 days      
Exercisable Options, Shares 496,175      
Weighted average exercise price per share, Options Exercisable $ 43.58      
Expected to Vest Options , Shares 1,061,101 [1]      
Expected to Vest Options, Weighted Average Exercise Price Per Share $ 43.55 [1]      
Range Three
        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Range, Low $ 44.83      
Range, High $ 53.38      
Options Outstanding, Shares 2,724,525      
Options Outstanding, Weighted Average Exercise Price Per Share $ 53.36      
Options Outstanding, Weighted Average Remaining Contractual Life (in Years) 4 years      
Exercisable Options, Shares 500      
Weighted average exercise price per share, Options Exercisable $ 46.97      
Expected to Vest Options , Shares 2,430,648 [1]      
Expected to Vest Options, Weighted Average Exercise Price Per Share $ 53.36 [1]      
Range Four
        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Range, Low $ 54.79      
Range, High $ 79.79      
Options Outstanding, Shares 27,500      
Options Outstanding, Weighted Average Exercise Price Per Share $ 67.64      
Options Outstanding, Weighted Average Remaining Contractual Life (in Years) 4 years      
Exercisable Options, Shares 0      
Expected to Vest Options , Shares 24,538 [1]      
Expected to Vest Options, Weighted Average Exercise Price Per Share $ 67.64 [1]      
[1] Assumes a weighted average forfeiture rate of 10.8%.