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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 | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Limited Partnership |  |
Class of Stock [Line Items] |  |
Number of units redeemed and cancelled for exchange (in shares) | 29.7 | 9.2
Class A Common Stock |  |
Class of Stock [Line Items] |  |
Common stock, shares issued (in shares) | 27.5 | 9.5

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