Earnings per Share and per Unit - Reconciliations of Numerator and Denominator in Calculations of Basic and Diluted Earnings (Loss) per Share and per Unit (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Basic and Diluted Earnings per Share:
Income from continuing operations attributable to AIR		$ 27,746		$ 10,735
Income from discontinued operations attributable to AIR		2,700		10,110
Net income (loss) attributable to AIR common stockholders	$ 9,289	$ (25,046)	$ 74,455	$ 20,845
Income from continuing operations attributable to AIR, Shares		119,967		119,957
Income from discontinued operations attributable to AIR, Shares		119,967		119,957
Net income attributable to AIR common stockholders, Shares	156,646	119,967	153,289	119,957
Income from continuing operations attributable to AIR, Per share amount		$ (0.23)		$ 0.09
Income from discontinued operations attributable to AIR, Per share amount		0.02		0.08
Net income (loss) attributable to AIR common stockholders per share - basic	$ 0.06	$ (0.21)	$ 0.49	$ 0.17
Diluted Earnings (loss) per Share:
Effect of dilutive securities	$ 0	$ 0	$ 0	$ 0
Net income attributable to AIR common stockholders	$ 9,289	$ (25,046)	$ 74,455	$ 20,845
Effect of dilutive securities, Shares	396	0	361	78
Net income attributable to AIR common stockholders, Shares	157,042	119,967	153,650	120,035
Effect of dilutive securities, Per share amount	$ 0	$ 0	$ (0.01)	$ 0
Net income (loss) attributable to AIR common stockholders per share - diluted	$ 0.06	$ (0.21)	$ 0.48	$ 0.17
Non-dilutive share equivalents outstanding	7,958	9,007	8,093	8,337
AIMCO Properties, LP [Member]
Basic and Diluted Earnings per Share:
Income from continuing operations attributable to AIR		$ 29,087		$ 11,869
Income from discontinued operations attributable to AIR		2,700		10,110
Net income (loss) attributable to AIR common stockholders	$ (9,764)	$ 26,387	$ 78,421	$ 21,979
Income from continuing operations attributable to AIR, Shares		126,399		126,440
Income from discontinued operations attributable to AIR, Shares		126,399		126,440
Net income attributable to AIR common stockholders, Shares	164,603	126,399	161,336	126,440
Income from continuing operations attributable to AIR, Per share amount		$ (0.23)		$ 0.09
Income from discontinued operations attributable to AIR, Per share amount		0.02		0.08
Net income (loss) attributable to AIR common stockholders per share - basic	$ 0.06	$ (0.21)	$ 0.49	$ 0.17
Diluted Earnings (loss) per Share:
Effect of dilutive securities		$ 0		$ 0
Net income attributable to AIR common stockholders	$ (9,764)	$ 26,387	$ 78,421	$ 21,979
Effect of dilutive securities, Shares	396	0	361	107
Net income attributable to AIR common stockholders, Shares	164,999	126,399	161,697	126,547
Effect of dilutive securities, Per share amount		$ 0		$ 0
Net income (loss) attributable to AIR common stockholders per share - diluted	$ 0.06	$ (0.21)	$ 0.48	$ 0.17
Non-dilutive share equivalents outstanding	45	2,220	615	1,596