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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, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Options Outstanding, Shares 7,436,238 7,558,945 6,594,950 8,802,450
Options Outstanding, Weighted Average Exercise Price Per Share $ 36.31 $ 31.63 $ 25.16 $ 25.03
Options Outstanding, Weighted Average Remaining Contractual Life (in Years) 3 years      
Exercisable Options, Shares 2,185,312      
Weighted average exercise price per share, Options Exercisable $ 30.40      
Expected to Vest Options , Shares 4,728,984 [1]      
Expected to Vest Options, Weighted Average Exercise Price Per Share $ 38.78 [1]      
Range One
        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Range, Low $ 16.22      
Range, High $ 16.22      
Options Outstanding, Shares 586,000      
Options Outstanding, Weighted Average Exercise Price Per Share $ 16.22      
Options Outstanding, Weighted Average Remaining Contractual Life (in Years) 10 months 24 days      
Exercisable Options, Shares 586,000      
Weighted average exercise price per share, Options Exercisable $ 16.22      
Range Two
        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Range, Low $ 30.32      
Range, High $ 31.18      
Options Outstanding, Shares 1,616,000      
Options Outstanding, Weighted Average Exercise Price Per Share $ 31.16      
Options Outstanding, Weighted Average Remaining Contractual Life (in Years) 2 years      
Exercisable Options, Shares 1,032,750      
Weighted average exercise price per share, Options Exercisable $ 31.17      
Expected to Vest Options , Shares 525,275 [1]      
Expected to Vest Options, Weighted Average Exercise Price Per Share $ 31.14 [1]      
Range Three
        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Range, Low $ 36.95      
Range, High $ 43.46      
Options Outstanding, Shares 2,797,050      
Options Outstanding, Weighted Average Exercise Price Per Share $ 37.03      
Options Outstanding, Weighted Average Remaining Contractual Life (in Years) 2 years 10 months 24 days      
Exercisable Options, Shares 11,250      
Weighted average exercise price per share, Options Exercisable $ 39.09      
Expected to Vest Options , Shares 2,508,891 [1]      
Expected to Vest Options, Weighted Average Exercise Price Per Share $ 37.02 [1]      
Range Four
        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Range, Low $ 43.67      
Range, High $ 54.79      
Options Outstanding, Shares 2,437,188      
Options Outstanding, Weighted Average Exercise Price Per Share $ 43.75      
Options Outstanding, Weighted Average Remaining Contractual Life (in Years) 3 years 1 month 6 days      
Exercisable Options, Shares 555,312      
Weighted average exercise price per share, Options Exercisable $ 43.75      
Expected to Vest Options , Shares 1,694,818 [1]      
Expected to Vest Options, Weighted Average Exercise Price Per Share $ 43.75 [1]      
[1] Assumes a weighted average forfeiture rate of 9.94%.