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Common Stock - Summary of Stock Options (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Number of shares under stock option, Beginning of the year 22,472,047 17,439,060 15,430,307
Number of Shares Granted 1,610,599 6,961,041 3,672,411
Number of Shares Forfeited (1,318,380) (1,482,531) (1,517,065)
Number of Shares Exercised (1,754,758) (445,523) (146,593)
Number of shares under stock option, End of the year 21,009,508 22,472,047 17,439,060
Number of stock options vested and expected to be vest, exercisable 15,223,029 14,309,944 9,828,897
Weighted Average Exercise Price, Beginning of year $ 48.99 $ 54.08 $ 59.50
Weighted Average Exercise Price, Stock Options Granted 35.09 36.51 28.26
Weighted Average Exercise Price, Stock Options Forfeited 57.56 55.22 49.95
Weighted Average Exercise Price, Stock Options Exercised 44.12 29.83 28.53
Weighted Average Exercise Price, End of the year 48.88 48.99 54.08
Weighted Average Exercise Price, Stock Options Exercisable $ 54.13 $ 55.00 $ 61.56