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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		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Class A Common Stock
Class of Stock [Line Items]
Common stock, shares issued (in shares)	4.7	13.8	7.9	15.4
Limited Partnership
Class of Stock [Line Items]
Number of units redeemed and cancelled for exchange (in shares)	4.8	14.6	8.1	16.3

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Number of units redeemed and cancelled for exchange.

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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.

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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).

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