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Investments - Narrative (Details) ft² in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) ft² home investor loan community | Dec. 31, 2021 USD ($) ft² community | Dec. 31, 2020 USD ($) community ft² | Dec. 31, 2018 community ft² home
Schedule of Equity Method Investments [Line Items] |  |  |  |
Preferred interest obligation redemption and dividends | $ 860 | $ 1,340 | $ 1,000 |
Total principal outstanding | $ 8,377,827 | $ 8,170,431 |  |
Number of units in real estate property | home | 88,475 |  |  |
Commercial square feet | ft² | 16 | 90 | 0 |
Other commitment | $ 92,375 |  |  |
Number of mezzanine loans | loan | 3 |  |  |
Weighted average rate of return, commitments | 9.80% |  |  |
Outstanding funding, commitments | $ 29,352 |  |  |
US Fund |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage of equity method investment | 28.60% |  |  |
Number of apartment communities sold | community |  |  | 1 |
Proceeds from sale of real estate | $ 313,500 |  |  |
Income for promoted interest | (4,690) |  |  |
Equity method investments | $ 6,109 |  |  |
US Fund | Avalon Grosvenor Tower, Avalon Studio 4121 and Avalon Station 250 |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of apartment homes sold | home | 671 |  |  |
Realized gain (loss) on disposal of equity method investment | $ 38,144 |  |  |
US Fund | Avalon Venice on Rose |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Realized gain (loss) on disposal of equity method investment |  |  | $ 5,157 |
ACJV |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage of equity method investment | 20.00% |  |  |
ACJV | Avalon North Point and Avalon North Point Lofts |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Realized gain (loss) on disposal of equity method investment |  | $ 23,305 |  |
Legacy JV |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage of equity method investment | 40.00% |  |  |
Preferred interest obligation liquidation value | $ 34,159 |  |  |
NYC JV |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage of equity method investment | 20.00% |  |  |
Equity method investments | $ 58,157 |  |  |
Total principal outstanding | $ 395,189 |  |  |
MVPI LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage of equity method investment | 25.00% |  |  |
Total principal outstanding | $ 103,000 |  |  |
Number of units in real estate property | home | 313 |  |  |
Brandywine |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage of equity method investment | 28.70% |  |  |
Equity method investments | $ 15,213 |  |  |
Total principal outstanding | $ 19,731 |  |  |
Number of units in real estate property | home | 305 |  |  |
Number of members who hold various interests in joint venture | investor | 5 |  |  |
Avalon Alderwood Mall |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage of equity method investment | 50.00% |  |  |
Equity method investments | $ 54,938 |  |  |
Number of units in real estate property | home | 328 |  |  |
AVA Arts District |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage of equity method investment | 25.00% |  |  |
Equity method investments | $ 28,660 |  |  |
Number of units in real estate property | home | 475 |  |  |
Commercial square feet | ft² | 56 |  |  |
Long-term construction loan | $ 167,147 |  |  |
Percent of development funded by borrowing | 60.00% |  |  |
Proceeds from construction loans payable | $ 86,664 |  |  |
Property Technology Investments |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments and equity securities | 36,178 |  |  |
Other commitment | 34,299 |  |  |
Gain (loss) on equity securities | $ (8,315) | $ (15,908) |  |
NYC JV |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Retail square feet sold | ft² |  |  |  | 58
US Fund |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of apartment communities sold | community | 3 |  |  |
ACJV |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of apartment communities sold | community |  | 2 |  |
NYC JV |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of apartment communities sold | community |  |  |  | 5
Number of apartment homes sold | home |  |  |  | 1,301
Notes payable maturing in 2022 | Secured notes | Avalon Grosvenor Tower, Avalon Studio 4121 and Avalon Station 250 |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Repayments of secured debt | $ 115,213 |  |  |

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