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Common Stock - Summary of Stock Options (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Number of shares under stock option, Beginning of the year 15,430,307 10,881,133 11,535,566
Number of Shares Granted 3,672,411 5,746,153 3,389,547
Number of Shares Spun-off     (1,567,348)
Number of Shares Cancelled (1,517,065) (886,356) (498,967)
Number of Shares Exercised (146,593) (310,623) (1,977,665)
Number of shares under stock option, End of the year 17,439,060 15,430,307 10,881,133
Number of stock options vested and expected to be vest, exercisable 9,828,897 7,498,414 5,903,712
Weighted Average Exercise Price, Beginning of year $ 59.50 $ 61.22 $ 58.36
Weighted Average Exercise Price, Stock Options Granted 28.26 54.74 69.00
Weighted Average Exercise Price, Stock Options Spun off     70.56
Weighted Average Exercise Price, Stock Options Canceled 49.95 62.73 70.32
Weighted Average Exercise Price, Stock Options Exercised 28.53 22.56 53.56
Weighted Average Exercise Price, End of the year 54.08 59.50 61.22
Weighted Average Exercise Price, Stock Options Exercisable $ 61.56 $ 60.30 $ 55.06