Variable Interest Entities (Details) $ in Thousands	Oct. 31, 2021 Multi_family_apartment	Sep. 30, 2021 USD ($) ApartmentHome Property Unit Entity	Dec. 31, 2020 USD ($) Property Entity Unit	Sep. 30, 2020 ApartmentHome
Number of apartment homes in apartment communities	1,748	58		219
Net real estate		$ 4,715,853	$ 5,013,359
Cash and cash equivalents		73,687	44,214
Restricted cash		23,440	29,266
Other assets		588,668	576,026
Non-recourse property debt, net		3,013,913	3,628,236
Accrued liabilities and other		$ 610,217	$ 598,736
Variable Interest Entity, Primary Beneficiary [Member]
VIEs with interests in apartment communities | Entity		5	5
Number of owned and managed apartment communities in segments | Property		16	16
Number of apartment homes in apartment communities | Unit		5,369	5,369
Net real estate		$ 1,103,337	$ 1,125,315
Cash and cash equivalents		30,354	10,548
Restricted cash		2,184	8,818
Other assets		22,927	23,870
Non-recourse property debt, net		1,231,083	1,278,318
Accrued liabilities and other		$ 38,768	$ 34,038