Investments - Narrative (Details) ft² in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) entity commitment home investor ft²	Dec. 31, 2022 USD ($) community	Dec. 31, 2021 USD ($) community	Dec. 31, 2018 community ft² home
Schedule of Equity Method Investments [Line Items]
Additional SIP commitments | commitment	4
Other commitment, new	$ 99,210
Other Commitments, Number of SIP Commitments | commitment	7
Other commitment	$ 191,585
Weighted average rate of return, commitments	11.50%
Outstanding funding, commitments	$ 96,461
Preferred interest obligation redemption and dividends	940	$ 860	$ 1,340
Total principal outstanding	$ 8,044,042	$ 8,377,827
Number of units in real estate property | home	90,669
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
Unconsolidated Real Estate Entity Under Development
Schedule of Equity Method Investments [Line Items]
Unconsolidated real estate entities | entity	1
Property and construction management roles
Schedule of Equity Method Investments [Line Items]
Unconsolidated real estate entities | entity	5
Property and construction management roles | Minimum
Schedule of Equity Method Investments [Line Items]
Ownership percentage of equity method investment	20.00%
Property and construction management roles | Maximum
Schedule of Equity Method Investments [Line Items]
Ownership percentage of equity method investment	50.00%
US Fund
Schedule of Equity Method Investments [Line Items]
Ownership percentage of equity method investment	28.60%
Income for promoted interest	$ 1,519	$ 4,690
US Fund | Avalon Grosvenor Tower, Avalon Studio 4121 and Avalon Station 250
Schedule of Equity Method Investments [Line Items]
Realized gain (loss) on disposal of equity method investment		38,144
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	$ 34,124
NYC JV
Schedule of Equity Method Investments [Line Items]
Ownership percentage of equity method investment	20.00%
Total principal outstanding	$ 394,734
Equity method investments	$ 55,695
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%
Total principal outstanding	$ 19,062
Equity method investments	$ 14,602
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	$ 53,638
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%
Proceeds from construction loans payable	$ 135,983
Equity method investments	$ 32,738
Number of units in real estate property | home	475
Commercial square feet | ft²	56
Long-term construction loan	$ 167,147
Property Technology Investments
Schedule of Equity Method Investments [Line Items]
Other commitment	73,892
Equity method investments and equity securities	46,926
Gain (loss) on equity securities	$ 4,161	$ 8,315	$ 15,908