Share-Based Compensation - Stock Option Activity and Weighted Average Exercise Price (Detail) - Stock Option Plans	12 Months Ended
Dec. 31, 2020 $ / shares shares
Outstanding Shares
Beginning Balance \| shares	5,654,258
Granted \| shares	606,060
Exercised \| shares	(428,617)
Forfeited \| shares	(729,405)
Ending Balance \| shares	5,102,296
Options exercisable at end of period \| shares	3,398,589
Weighted-Average Exercise Price
Beginning Balance \| $ / shares	$ 96.83
Granted \| $ / shares	93.88
Exercised \| $ / shares	72.49
Forfeited \| $ / shares	95.62
Ending Balance \| $ / shares	98.70
Options exercisable at end of period \| $ / shares	$ 102.23

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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Net 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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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