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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2021
Stock-Based Compensation [Abstract] |
Summary of Stock Option Activity |
|  |  |  | Weighted- |  | Weighted-Average |  |  |
|  |  |  | Average |  | Remaining |  |  |
|  | Number |  | Exercise Price |  | Contractual |  | Aggregate
|  | of Shares |  | Per Share |  | Life (in years) |  | Intrinsic Value
Outstanding at December 31, 2020 |  | 3,202 |  | $ | 143.01 |  |  |  |  |
Exercised |  | (70) |  | $ | 122.72 |  |  |  |  |
Forfeited/canceled |  | (7) |  | $ | 173.81 |  |  |  |  |
Outstanding at March 31, 2021 |  | 3,125 |  | $ | 143.39 |  | 3.5 |  | $ | 419,128
Exercisable at March 31, 2021 |  | 2,371 |  | $ | 132.98 |  | 3.2 |  | $ | 342,849
Unvested at March 31, 2021 |  | 754 |  | $ | 176.21 |  | 4.7 |  | $ | 76,279
Summary of Restricted Stock Unit and Performance Based Restricted Stock Unit Activity |
|  | RSUs |  | PSUs
|  |  |  | Weighted-Average |  |  |  | Weighted-Average
|  | Number of |  | Grant Date Fair |  | Number of |  | Grant Date Fair
|  | Shares |  | Value per Share |  | Shares |  | Value per Share
|  | (in thousands) |  |  |  |  | (in thousands) |  |  |
Outstanding at December 31, 2020 (1) |  | 274 |  | $ | 206.48 |  | 148 |  | $ | 376.48
Granted (1) |  | 101 |  | $ | 235.92 |  | 153 |  | $ | 236.48
Vested |  | (122) |  | $ | 185.34 |  | — |  | $ | —
Forfeited/canceled |  | (3) |  | $ | 224.37 |  | (1) |  | $ | 376.50
Outstanding at March 31, 2021 |  | 250 |  | $ | 228.47 |  | 300 |  | $ | 304.80
(1)PSUs represent the target number of shares granted that are issuable at the end of the three year performance period. Fair value for a portion of the PSUs was calculated using a Monte Carlo simulation model.

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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