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Common Stock - Summary of Information and Changes in Stock Options with Regard to Stock Option Plans (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Number of shares under stock option, Beginning of the year 10,881,133 11,535,566 10,274,477
Number of Shares Granted 5,746,153 3,389,547 3,072,086
Number of Shares Cancelled (886,356) (498,967) (329,002)
Number of Shares Exercised (310,623) (1,977,665) (1,481,995)
Number of shares under stock option, End of the year 15,430,307 10,881,133 11,535,566
Number of stock options, Vested or expected to vest 15,229,713    
Number of stock options, Exercisable 7,498,414 5,903,712 6,324,117
Weighted Average Exercise Price, Beginning of year $ 61.22 $ 58.36 $ 54.11
Weighted Average Exercise Price, Stock Options Granted 54.74 69.00 63.96
Weighted Average Exercise Price, Stock Options Cancelled 62.73 70.32 66.78
Weighted Average Exercise Price, Stock Options Exercised 22.56 53.56 38.75
Weighted Average Exercise Price, End of the year 59.50 61.22 58.36
Weighted Average Exercise Price, Stock options vested or expected to vest 59.50    
Weighted Average Exercise Price, Stock Options, Exercisable $ 60.30 $ 55.06 $ 49.29
Weighted Average Remaining Contractual Term, Outstanding 7 years 4 days 5 years 1 month 24 days  
Weighted Average Remaining Contractual Term, Vested 7 years 4 days    
Weighted Average Remaining Contractual Term, Exercisable 5 years 1 month 28 days    
Stock Options Aggregate Intrinsic Value, Beginning $ 85,503,217    
Stock Options Aggregate Intrinsic Value, Ending 5,894,977 $ 85,503,217  
Stock Options Average Aggregate Intrinsic Value, Vested or expected to Vest 5,814,216    
Stock Options Average Aggregate Intrinsic Value, Exercisable $ 5,894,977