Earnings and Dividends per Share and Unit - Reconciliations of Numerator and Denominator in Calculations of Basic and Diluted Earnings per Share and per Unit (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Schedule of Earnings Per Share and Dividends Per Share [Line Items]
Net income attributable to Aimco common stockholders	$ 20,214	$ 4,427
Basic weighted-average Common Stock outstanding	148,914	148,549
Diluted share equivalents outstanding	132	20
Diluted weighted-average Common Stock outstanding	149,046	148,569
Net income attributable to Aimco per common share – basic	$ 0.14	$ 0.03
Net income attributable to Aimco per common share – diluted	$ 0.14	$ 0.03
Aimco OP L.P. [Member]
Schedule of Earnings Per Share and Dividends Per Share [Line Items]
Net income attributable to Aimco common stockholders	$ 21,295	$ 4,663
Basic weighted-average Common Stock outstanding	156,882	156,480
Diluted share equivalents outstanding	132	20
Diluted weighted-average Common Stock outstanding	157,014	156,500
Net income attributable to Aimco per common share – basic	$ 0.14	$ 0.03
Net income attributable to Aimco per common share – diluted	$ 0.14	$ 0.03