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Noncontrolling Interests - Noncontrolling Interest Summary (Parenthetical) (Detail) - shares shares in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Long Term Incentive Plan Units [Member] |  |
Noncontrolling Interest [Line Items] |  |
Vested LTIP Units | 4.7 | 3.9
Class A Common [Member] |  |
Noncontrolling Interest [Line Items] |  |
Outstanding limited partnership units, exchanged | 8.0 | 8.0
Units outstanding | 8.6 | 8.6
Common Unit [Member] |  |
Noncontrolling Interest [Line Items] |  |
Outstanding limited partnership units, exchanged | 8.2 | 8.2
Other Consolidated Entities [Member] |  |
Noncontrolling Interest [Line Items] |  |
Outstanding limited partnership units, exchanged | 0.3 | 0.3
Other Consolidated Entities [Member] | Common Stock [Member] |  |
Noncontrolling Interest [Line Items] |  |
Outstanding limited partnership units | 0.3 | 0.3

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