Organization, Basis of Presentation and Significant Accounting Policies (Details) ft² in Thousands, $ in Thousands	3 Months Ended		9 Months Ended		21 Months Ended
	Sep. 30, 2021 USD ($) home residential_condominium ft² community state	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) home residential_condominium ft² community state	Sep. 30, 2020 USD ($)	Sep. 30, 2021 home residential_condominium ft² community state
Real Estate Properties [Line Items]
Number of operating apartment communities | community	276		276		276
Number of apartment homes included in operating apartment communities owned | home	81,968		81,968		81,968
Number of states where operating apartment communities owned are located | state	13		13		13
Number of owned communities under construction | community	17		17		17
Expected number of apartment homes under construction | home	5,448		5,448		5,448
Number of Residential Condominium Units Sold | residential_condominium	17		43		113
Communities under development rights | community	22		22		22
Estimated number of apartment homes in communities to be developed | home	7,376		7,376		7,376
Accounts Receivable, Credit Loss Expense (Reversal) | $	$ 8,586	$ 18,755	$ 42,295	$ 43,034
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Real Estate Properties [Line Items]
Number Of Residential Condominium Units | residential_condominium	172		172		172
Commercial Square Feet | ft²	66		66		66
Percent of Commercial Square Feet Leased	87.00%		87.00%		87.00%