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Additional Information Regarding Outstanding Exercisable and Vested and Exercisable Stock Options (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options Outstanding - Range of Exercise Prices, Lower Limit $ 0.30  
Options Outstanding - Range of Exercise Prices, Upper Limit $ 762.50  
Options Outstanding - Number of Shares 8,551,395 9,807,252
Options Outstanding - Weighted-Average Remaining Life 5 years 2 months 12 days  
Options Outstanding - Weighted-Average Exercise Price $ 405.98 $ 357.92
Options Exercisable - Number of Shares 6,027,202  
Options Exercisable - Weighted-Average Exercise Price $ 351.28  
Options Vested and Exercisable - Number of Shares 6,023,559  
Options Vested and Exercisable - Weighted-Average Exercise Price $ 351.44  
Range 1
   
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options Outstanding - Range of Exercise Prices, Lower Limit $ 0.30  
Options Outstanding - Range of Exercise Prices, Upper Limit $ 94.80  
Options Outstanding - Number of Shares 116,852  
Options Outstanding - Weighted-Average Remaining Life 1 year 8 months 12 days  
Options Outstanding - Weighted-Average Exercise Price $ 37.03  
Options Exercisable - Number of Shares 116,852  
Options Exercisable - Weighted-Average Exercise Price $ 37.03  
Options Vested and Exercisable - Number of Shares 113,209  
Options Vested and Exercisable - Weighted-Average Exercise Price $ 35.41  
Range 2
   
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options Outstanding - Range of Exercise Prices, Lower Limit $ 117.84  
Options Outstanding - Range of Exercise Prices, Upper Limit $ 198.41  
Options Outstanding - Number of Shares 248,831  
Options Outstanding - Weighted-Average Remaining Life 2 years  
Options Outstanding - Weighted-Average Exercise Price $ 178.65  
Options Exercisable - Number of Shares 248,831  
Options Exercisable - Weighted-Average Exercise Price $ 178.65  
Options Vested and Exercisable - Number of Shares 248,831  
Options Vested and Exercisable - Weighted-Average Exercise Price $ 178.65  
Range 3
   
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options Outstanding - Range of Exercise Prices, Lower Limit $ 205.96  
Options Outstanding - Range of Exercise Prices, Upper Limit $ 298.86  
Options Outstanding - Number of Shares 282,647  
Options Outstanding - Weighted-Average Remaining Life 2 years 4 months 24 days  
Options Outstanding - Weighted-Average Exercise Price $ 275.51  
Options Exercisable - Number of Shares 282,552  
Options Exercisable - Weighted-Average Exercise Price $ 275.51  
Options Vested and Exercisable - Number of Shares 282,552  
Options Vested and Exercisable - Weighted-Average Exercise Price $ 275.51  
Range 4
   
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options Outstanding - Range of Exercise Prices, Lower Limit $ 300.97  
Options Outstanding - Range of Exercise Prices, Upper Limit $ 399.00  
Options Outstanding - Number of Shares 3,998,815  
Options Outstanding - Weighted-Average Remaining Life 3 years 9 months 18 days  
Options Outstanding - Weighted-Average Exercise Price $ 309.39  
Options Exercisable - Number of Shares 3,642,248  
Options Exercisable - Weighted-Average Exercise Price $ 309.57  
Options Vested and Exercisable - Number of Shares 3,642,248  
Options Vested and Exercisable - Weighted-Average Exercise Price $ 309.57  
Range 5
   
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options Outstanding - Range of Exercise Prices, Lower Limit $ 401.78  
Options Outstanding - Range of Exercise Prices, Upper Limit $ 499.07  
Options Outstanding - Number of Shares 993,591  
Options Outstanding - Weighted-Average Remaining Life 5 years 10 months 24 days  
Options Outstanding - Weighted-Average Exercise Price $ 442.95  
Options Exercisable - Number of Shares 766,098  
Options Exercisable - Weighted-Average Exercise Price $ 441.55  
Options Vested and Exercisable - Number of Shares 766,098  
Options Vested and Exercisable - Weighted-Average Exercise Price $ 441.55  
Range 6
   
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options Outstanding - Range of Exercise Prices, Lower Limit $ 501.27  
Options Outstanding - Range of Exercise Prices, Upper Limit $ 595.35  
Options Outstanding - Number of Shares 1,803,839  
Options Outstanding - Weighted-Average Remaining Life 6 years 10 months 24 days  
Options Outstanding - Weighted-Average Exercise Price $ 536.31  
Options Exercisable - Number of Shares 848,574  
Options Exercisable - Weighted-Average Exercise Price $ 529.82  
Options Vested and Exercisable - Number of Shares 848,574  
Options Vested and Exercisable - Weighted-Average Exercise Price $ 529.82  
Range 7
   
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options Outstanding - Range of Exercise Prices, Lower Limit $ 601.17  
Options Outstanding - Range of Exercise Prices, Upper Limit $ 699.35  
Options Outstanding - Number of Shares 1,089,126  
Options Outstanding - Weighted-Average Remaining Life 8 years 10 months 24 days  
Options Outstanding - Weighted-Average Exercise Price $ 629.41  
Options Exercisable - Number of Shares 120,757  
Options Exercisable - Weighted-Average Exercise Price $ 614.76  
Options Vested and Exercisable - Number of Shares 120,757  
Options Vested and Exercisable - Weighted-Average Exercise Price $ 614.76  
Range 8
   
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options Outstanding - Range of Exercise Prices, Lower Limit $ 710.84  
Options Outstanding - Range of Exercise Prices, Upper Limit $ 762.50  
Options Outstanding - Number of Shares 17,694  
Options Outstanding - Weighted-Average Remaining Life 9 years 8 months 12 days  
Options Outstanding - Weighted-Average Exercise Price $ 762.27  
Options Exercisable - Number of Shares 1,290  
Options Exercisable - Weighted-Average Exercise Price $ 759.30  
Options Vested and Exercisable - Number of Shares 1,290  
Options Vested and Exercisable - Weighted-Average Exercise Price $ 759.30