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Investments - Narrative (Details) ft² in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) ft² home community investor | Dec. 31, 2020 USD ($) community | Dec. 31, 2019 USD ($) home community | Dec. 31, 2018 community ft² home
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of real estate properties | community | 278 |  |  |
Preferred interest obligation redemption and dividends | $ (1,340) | $ (1,000) | $ (1,400) |
Number of units in real estate property | home | 81,803 |  |  |
Number of communities acquired | community | 7 | 0 | 5 |
Gain on sale of communities | $ 602,235 | $ 340,444 | $ 166,105 |
Number of apartment homes acquired | home |  |  | 1,175 |
Payments to acquire other real estate | $ 771,692 | $ 0 | $ 420,517 |
AVA North Point |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Payments to acquire other real estate |  |  | 71,280 |
Avalon Arundel Crossing East |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of apartment homes acquired | home | 384 |  |  |
Payments to acquire other real estate | $ 119,000 |  |  |
Avalon Lakeside |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of apartment homes acquired | home | 425 |  |  |
Payments to acquire other real estate | $ 117,000 |  |  |
Commercial square feet | ft² | 18 |  |  |
Hub South End |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of apartment homes acquired | home | 265 |  |  |
Payments to acquire other real estate | $ 104,350 |  |  |
Commercial square feet | ft² | 23 |  |  |
Three30Five |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of apartment homes acquired | home | 164 |  |  |
Payments to acquire other real estate | $ 52,650 |  |  |
Avalon Fort Lauderdale |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of apartment homes acquired | home | 243 |  |  |
Payments to acquire other real estate | $ 150,000 |  |  |
Commercial square feet | ft² | 49 |  |  |
Avalon Miramar |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of apartment homes acquired | home | 380 |  |  |
Payments to acquire other real estate | $ 133,000 |  |  |
Hawk |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of apartment homes acquired | home | 71 |  |  |
Payments to acquire other real estate | $ 48,500 |  |  |
2019 Acquisitions |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Payments to acquire other real estate |  |  | $ 345,450 |
US Fund |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage of equity method investment | 28.60% |  |  |
Number of apartment communities sold | community |  | 1 | 1 |
Number of real estate properties | community | 3 |  |  |
Equity method investments | $ 18,706 |  |  |
US Fund | Avalon Venice on Rose |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Realized gain (loss) on disposal of equity method investment |  | $ 5,157 |  |
US Fund | Avalon Marina Bay |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Realized gain (loss) on disposal of equity method investment |  |  | $ 5,788 |
ACJV |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage of equity method investment | 20.00% |  |  |
Equity method investments | $ 2,579 |  |  |
Proceeds from sale of real estate | 325,000 |  |  |
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 |  |  |
Number of apartment homes sold | home | 529 |  |  |
Legacy JV |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage of equity method investment | 40.00% |  |  |
Preferred interest obligation liquidation value | $ 34,468 |  |  |
AVA North Point |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage of equity method investment |  |  | 55.00% |
Number of units in real estate property | home | 265 |  |  |
AVA North Point | Joint Venture Partner |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage of equity method investment |  |  | 45.00% |
NYC JV |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage of equity method investment | 20.00% |  |  |
Equity method investments | $ 61,307 |  |  |
MVPI LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage of equity method investment | 25.00% |  |  |
Number of units in real estate property | home | 313 |  |  |
Long-term debt, gross | $ 103,000 |  |  |
Brandywine |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage of equity method investment | 28.70% |  |  |
Equity method investments | $ 16,010 |  |  |
Number of units in real estate property | home | 305 |  |  |
Long-term debt, gross | $ 20,379 |  |  |
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 | $ 55,054 |  |  |
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 | $ 30,436 |  |  |
Number of units in real estate property | home | 475 |  |  |
Percent of development funded by borrowing | 60.00% |  |  |
Long-term construction loan | $ 167,147 |  |  |
Proceeds from construction loans payable | $ 11,581 |  |  |
Commercial square feet | ft² | 56 |  |  |
Property Technology Investments |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Other commitment | $ 39,890 |  |  |
Gain (loss) on equity securities | (15,908) |  |  |
Equity Method Investments and Equity Securities | $ 17,277 |  |  |
NYC JV |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Retail square feet sold | ft² |  |  |  | 58
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 Maturities 2021 | Secured notes | Avalon North Point and Avalon North Point Lofts |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Repayments of secured debt | $ 111,653 |  |  |

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