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Capital Stock - Additional Information (Detail) - shares | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Class of Stock [Line Items] |  |  |
Common stock shares issued (in shares) | 100,259,182 | 100,259,182 | 96,241,596
Common stock shares outstanding (in shares) | 100,259,182 | 100,259,182 | 96,241,596
Shares Converted From Class B to Class A |  |  |
Class of Stock [Line Items] |  |  |
Conversion of stock, shares converted (in shares) | 13,630,921 | 45,404,934 |
Common Class A |  |  |
Class of Stock [Line Items] |  |  |
Common stock shares issued (in shares) | 70,394,686 | 70,394,686 |
Common stock shares outstanding (in shares) | 70,394,686 | 70,394,686 |
Common Class B |  |  |
Class of Stock [Line Items] |  |  |
Common stock shares issued (in shares) | 29,864,496 | 29,864,496 |
Common stock shares outstanding (in shares) | 29,864,496 | 29,864,496 |

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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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