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Common Stock - Summary of Stock Options (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of shares under stock option, Beginning of the year	21,009,508	22,472,047	17,439,060
Number of Shares Granted	1,493,576	1,610,599	6,961,041
Number of Shares Forfeited	(944,917)	(1,318,380)	(1,482,531)
Number of Shares Exercised	(248,068)	(1,754,758)	(445,523)
Number of shares under stock option, End of the year	21,310,099	21,009,508	22,472,047
Number of stock options vested and expected to be vest, exercisable	17,796,607	15,223,029	14,309,944
Weighted Average Exercise Price, Beginning of year	$ 48.88	$ 48.99	$ 54.08
Weighted Average Exercise Price, Stock Options Granted	28.72	35.09	36.51
Weighted Average Exercise Price, Stock Options Forfeited	50.57	57.56	55.22
Weighted Average Exercise Price, Stock Options Exercised	29.70	44.12	29.83
Weighted Average Exercise Price, End of the year	47.68	48.88	48.99
Weighted Average Exercise Price, Stock Options Exercisable	$ 50.49	$ 54.13	$ 55.00

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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