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Stockholders' Equity - Narrative (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Oct. 31, 2020
Restricted stock units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock units, approved (in shares) | 750,583 |  |
Weighted-average grant date fair value (in dollars per share) | $ 665.53 |  |
Requisite service period (in years) | 3 years 6 months |  |
2020 ATM Program |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Sale of stock, equity offering agreement, authorized |  |  | $ 1,500,000,000
Issuance of common stock in offering (in shares) |  | 0 |
Equity Forward Amendment under the 2020 ATM Program |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Sale of stock, equity offering agreement, available for sale | $ 1,000,000,000 |  |

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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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