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Organization - Schedule of Secondary Offerings (Detail) - $ / shares | Dec. 31, 2020 | Aug. 28, 2020 | Dec. 31, 2019 | Nov. 15, 2019 | Sep. 06, 2019 | Aug. 08, 2019 | May 23, 2019 | Mar. 22, 2019 | Apr. 30, 2018
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Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |
Shares of Common Stock Sold | 148,571,412 |  | 144,386,618 |  |  |  |  |  | 24,150,000
Secondary Offering [Member] |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |
Shares of Common Stock Sold |  | 7,717,347 |  | 10,000,000 | 9,000,000 | 10,000,000 | 8,000,000 | 14,222,142 |
Public Offering Price (per share) |  | $ 72.18 |  | $ 53.08 | $ 56.30 | $ 49.75 | $ 50.50 | $ 50.50 |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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