- Stock Option Activity and Weighted Average Exercise Price (Detail) - Stock Option Plans	12 Months Ended
Dec. 31, 2019 $ / shares shares
Outstanding Shares
Beginning Balance \| shares	4,575,926
Granted \| shares	1,460,602
Exercised \| shares	(166,008)
Forfeited \| shares	(216,262)
Ending Balance \| shares	5,654,258
Vested or expected to vest at end of period \| shares	5,654,258
Options exercisable at end of period \| shares	2,802,466
Weighted-Average Exercise Price
Beginning Balance \| $ / shares	$ 99.53
Granted \| $ / shares	86.21
Exercised \| $ / shares	65.90
Forfeited \| $ / shares	105.95
Ending Balance \| $ / shares	96.83
Vested or expected to vest at end of period \| $ / shares	96.83
Options exercisable at end of period \| $ / shares	$ 103.08

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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- Definition

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.

+ References

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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-Topic 718
-SubTopic 10
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-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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- Definition

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

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- Definition

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

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- Definition

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

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- Definition

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

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-Name Accounting Standards Codification
-Topic 718
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