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Common Stock - Summary of Stock Options (Detail) - $ / shares
 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 Spun-off   (1,567,348)  
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 and expected to be vest, 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 Spun off   70.56  
Weighted Average Exercise Price, Stock Options Canceled 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 Exercisable $ 60.30 $ 55.06 $ 49.29