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Real Estate Disposition Activities (Details) ft² in Thousands	3 Months Ended			6 Months Ended		30 Months Ended
	Jun. 30, 2022 USD ($) community residential_condominium ft²	Mar. 31, 2022 USD ($) home	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) community residential_condominium ft²	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) community residential_condominium ft²	Dec. 31, 2021 USD ($)
Summary of income from discontinued operations
Gain on sale of communities	$ 404,000		$ 334,569,000	$ 149,204,000	$ 388,296,000
Number of communities held for sale \| community	3			3		3
Number of residential condominium units sold \| residential_condominium	13			28		151
Gain on for-sale condominiums				$ 1,469,000	706,000
Number of residential condominiums remaining to be sold \| residential_condominium	21			21		21
Other selling, general and administrative expense	$ 538,000		$ 1,222,000	$ 1,304,000	$ 2,266,000
For-sale condominium inventory	73,622,000			73,622,000		$ 73,622,000	$ 146,535,000
The Park Loggia
Summary of income from discontinued operations
Gross sales price	$ 41,002,000			$ 81,338,000
Number of residential condominium units \| residential_condominium	172			172		172
Square feet of commercial space \| ft²	66			66		66
Gain on for-sale condominiums	$ 467,000			$ 1,469,000
Avalon West Long Branch
Summary of income from discontinued operations
Number of apartment homes sold \| home		180
Gross sales price		$ 75,000,000
Gain on sale of communities		$ 56,434,000
Avalon Ossining
Summary of income from discontinued operations
Number of apartment homes sold \| home		168
Gross sales price		$ 70,000,000
Gain on sale of communities		$ 40,512,000
Avalon East Norwalk
Summary of income from discontinued operations
Number of apartment homes sold \| home		240
Gross sales price		$ 90,000,000
Gain on sale of communities		$ 51,762,000