Variable Interest Entities (Details) $ in Thousands	Dec. 31, 2020 USD ($) Property Entity Unit	Sep. 08, 2020 apartment_home Multi_family_apartment	Dec. 31, 2019 USD ($) Property Entity Unit
Number of apartment communities | Multi_family_apartment		12
Number of apartment homes in apartment communities | apartment_home		4,051
Net real estate	$ 5,013,359		$ 5,083,140
Cash and cash equivalents	44,214		136,458
Restricted cash	29,266		30,083
Other assets	576,026		604,593
Non-recourse property debt secured by AIR communities, net	3,628,236		3,737,805
Accrued liabilities and other	$ 598,736		$ 270,487
Variable Interest Entity, Primary Beneficiary [Member]
VIEs with interests in apartment communities | Entity	5		5
Number of apartment communities | Property	16		5
Number of apartment homes in apartment communities | Unit	5,369		2,016
Net real estate	$ 1,125,315		$ 201,425
Cash and cash equivalents	10,548		4,153
Restricted cash	8,818		2,047
Other assets	23,870		18,731
Non-recourse property debt secured by AIR communities, net	1,278,318		175,550
Accrued liabilities and other	$ 34,038		$ 23,780