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Shareholders' Equity - Additional Information (Detail)		3 Months Ended	6 Months Ended
	Feb. 17, 2021 USD ($)	Jun. 30, 2021 shares	Jun. 30, 2021 Vote shares	Dec. 31, 2020 shares
Class of Stock [Line Items]
Preferred stock, issued (in shares)		0	0	0
Preferred stock, outstanding (in shares)		0	0	0
Class A Common Stock
Class of Stock [Line Items]
Common stock holders voting right | Vote			1
Conversion of common stock conversion ratio			1
Class B Common Stock
Class of Stock [Line Items]
Common stock holders voting right | Vote			10
Class C Capital Stock | Equity Distribution Agreement
Class of Stock [Line Items]
Sale of stock, maximum consideration on transaction | $	$ 1,000,000,000.0
Shares of Class C capital stock sold (in shares)		0	3,163,502

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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-Name Accounting Standards Codification
-Topic 210
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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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Common stock voting rights held for each share.

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Sale of Stock, Maximum Consideration on Transaction

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