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Real Estate Disposition Activities (Details) ft² in Thousands	3 Months Ended				9 Months Ended		21 Months Ended
	Sep. 30, 2021 USD ($) residential_condominium ft² community	Jun. 30, 2021 USD ($) home	Mar. 31, 2021 USD ($) home	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) residential_condominium ft² community	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) residential_condominium ft² community	Dec. 31, 2020 USD ($)
Summary of income from discontinued operations
Gains (Losses) on Sales of Investment Real Estate	$ 58,000			$ 31,607,000	$ 388,354,000	$ 91,338,000
Number Of Communities Held For Sale \| community	1				1		1
Number of Residential Condominium Units Sold \| residential_condominium	17				43		113
Gain (Loss) on Sale of Other Investments					$ 2,051,000	8,174,000
Number of Residential Condominiums Remaining to be Sold \| residential_condominium	59				59		59
Other Selling, General and Administrative Expense	$ 1,187,000			$ 1,373,000	$ 3,453,000	$ 4,012,000
For-sale condominium inventory	171,113,000				171,113,000		$ 171,113,000	$ 267,219,000
The Park Loggia
Summary of income from discontinued operations
Proceeds from Sale of Real Estate	$ 54,277,000				$ 107,278,000
Number Of Residential Condominium Units \| residential_condominium	172				172		172
Commercial Square Feet \| ft²	66				66		66
Gain (Loss) on Sale of Other Investments	$ 1,345,000				$ 2,051,000
eaves Stamford
Summary of income from discontinued operations
Number Of Apartment Homes Sold \| home			238
Proceeds from Sale of Real Estate			$ 72,000,000
Gains (Losses) on Sales of Investment Real Estate			$ 53,775,000
Avalon Norwalk
Summary of income from discontinued operations
Number Of Apartment Homes Sold \| home		311
Proceeds from Sale of Real Estate		$ 103,000,000
Gains (Losses) on Sales of Investment Real Estate		$ 48,912,000
AVA Cortez Hill
Summary of income from discontinued operations
Number Of Apartment Homes Sold \| home		299
Proceeds from Sale of Real Estate		$ 96,500,000
Gains (Losses) on Sales of Investment Real Estate		$ 75,716,000
Avalon Redmond Place
Summary of income from discontinued operations
Number Of Apartment Homes Sold \| home		222
Proceeds from Sale of Real Estate		$ 97,700,000
Gains (Losses) on Sales of Investment Real Estate		$ 72,929,000
Avalon Bronxville
Summary of income from discontinued operations
Number Of Apartment Homes Sold \| home		110
Proceeds from Sale of Real Estate		$ 89,000,000
Gains (Losses) on Sales of Investment Real Estate		$ 71,773,000
Avalon Glen Cove and Avalon Glen Cove North
Summary of income from discontinued operations
Number Of Apartment Homes Sold \| home		367
Proceeds from Sale of Real Estate		$ 126,000,000
Gains (Losses) on Sales of Investment Real Estate		$ 65,242,000