Variable Interest Entities (Details) $ in Thousands	Sep. 30, 2020 USD ($) Property Entity Unit	Dec. 31, 2019 USD ($) Property Entity Unit
Net real estate	$ 6,039,984	$ 6,019,307
Cash and cash equivalents	228,368	142,902
Restricted cash	40,123	34,800
Other assets	383,298	351,472
Non-recourse property debt, net, secured by Aimco communities	4,058,295	4,230,590
Accrued liabilities and other	$ 356,538	$ 360,574
Variable Interest Entity, Primary Beneficiary [Member]
VIEs with interests in apartment communities | Entity	6	6
Number of apartment communities | Property	17	6
Number of apartment homes in apartment communities | Unit	5,409	2,056
Net real estate	$ 1,424,820	$ 501,272
Cash and cash equivalents	15,908	11,600
Restricted cash	8,648	2,063
Other assets	38,815	40,459
Non-recourse property debt, net, secured by Aimco communities	1,284,252	175,842
Deferred tax liability	136,968	147,722
Accrued liabilities and other	$ 42,845	$ 36,107