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Summary of Option Activities (Detail) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |
Outstanding Options, Number of shares, beginning balance | 8,133,176 |  |
Granted, Number of Shares | 2,589,966 |  |
Exercised, Number of Shares | (1,534,741) |  |
Expired, Number of Shares | (551,750) |  |
Cancelled, Number of Shares | (397,685) |  |
Outstanding Options, Number of shares, ending balance | 8,238,966 |  |
Outstanding options vested and exercisable, Number of Shares | 2,522,906 | 2,551,267 | 3,724,179
Outstanding Options, Average Option Price, beginning balance | $ 124.52 |  |
Granted, Average Option Price | 70.36 |  |
Exercised, Average Option Price | 118.99 |  |
Expired, Average Option Price | 117.30 |  |
Cancelled, Average Option Price | 114.79 |  |
Outstanding Options, Average Option Price, ending balance | 109.47 |  |
Outstanding options vested and exercisable, Average Option Price | $ 124.62 | $ 119.86 | $ 106.77

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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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