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Stock Transactions and Unit Redemptions - Changes in Shares of Class A Common Stock Outstanding Table Footnote (Detail) - shares shares in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Class A Common Stock
Class of Stock [Line Items]
Common stock, shares issued (in shares)	3.3	1.6
Limited Partnership
Class of Stock [Line Items]
Number of units redeemed and cancelled for exchange (in shares)	3.3	1.7

X

- Definition

Number of units redeemed and cancelled for exchange.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

The number of shares issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit).

+ References

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