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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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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.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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