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Real Estate Disposition Activities (Details) ft² in Thousands	3 Months Ended			6 Months Ended		18 Months Ended
	Jun. 30, 2021 USD ($) home residential_condominium ft² community	Mar. 31, 2021 USD ($) home	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) residential_condominium ft² community	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) residential_condominium ft² community	Dec. 31, 2020 USD ($)
Summary of income from discontinued operations
Gains (Losses) on Sales of Investment Real Estate	$ 334,569,000		$ 35,295,000	$ 388,296,000	$ 59,731,000
Number Of Communities Held For Sale \| community	0			0		0
Number of Residential Condominium Units Sold \| residential_condominium	16			26		96
Gain (Loss) on Sale of Other Investments				$ 706,000	7,446,000
Number of Residential Condominiums Remaining to be Sold \| residential_condominium	76			76		76
Other Selling, General and Administrative Expense	$ 1,222,000		$ 1,196,000	$ 2,266,000	$ 2,639,000
For-sale condominium inventory	$ 220,022,000			220,022,000		$ 220,022,000	$ 267,219,000
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
The Park Loggia [Member]
Summary of income from discontinued operations
Proceeds from Sale of Real Estate	$ 38,392,000			$ 53,001,000
Number Of Residential Condominium Units \| residential_condominium	172			172		172
Commercial Square Feet \| ft²	66			66		66
Gain (Loss) on Sale of Other Investments	$ 575,000			$ 706,000