Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
REVENUES
Rental and other property revenues	$ 215,455	$ 229,827	$ 658,815	$ 684,262
OPERATING EXPENSES
Property operating expenses	74,929	77,484	224,532	232,090
Depreciation and amortization	98,249	97,538	296,414	283,027
General and administrative expenses	8,118	10,595	27,922	31,922
Investment management expenses	2,819	1,581	5,124	4,319
Other expenses, net	17,571	4,002	23,452	12,759
Total operating expenses	201,686	191,200	577,444	564,117
Interest income	3,041	2,824	10,407	8,615
Interest expense	(50,519)	(42,011)	(140,657)	(122,961)
Gain on dispositions of real estate	0	1,146	47,204	356,929
Mezzanine / Unconsolidated partnerships investment income, net	6,870	0	20,553	0
(Loss) income before income tax benefit	(26,562)	874	19,507	363,319
Income tax benefit	1,747	3,096	7,859	1,942
Net (loss) income	(24,815)	3,970	27,366	365,261
Noncontrolling interests:
Net loss (income) attributable to noncontrolling interests in consolidated real estate partnerships	154	58	153	(103)
Net income attributable to preferred noncontrolling interests in Aimco Operating Partnership	(1,687)	(1,933)	(5,415)	(5,800)
Net income attributable to common noncontrolling interests in Aimco Operating Partnership	1,341	(116)	(1,134)	(18,787)
Net income attributable to noncontrolling interests	(192)	(1,991)	(6,396)	(24,690)
Net income attributable to the company	(25,007)	1,979	20,970	340,571
Net income attributable to the company's preferred equity holders	0	0	0	(7,335)
Net (income) loss attributable to participating securities	(39)	24	(125)	(431)
Net income attributable to the company's common equity holders	$ (25,046)	$ 2,003	$ 20,845	$ 332,805
Net income attributable to Aimco per common share – basic and diluted	$ (0.17)	$ 0.01	$ 0.14	$ 2.26
Weighted average common shares/units outstanding - basic	148,544	148,434	148,532	147,474
Weighted average common shares/units outstanding - diluted	148,544	148,636	148,628	147,692
AIMCO Properties, LP [Member]
REVENUES
Rental and other property revenues	$ 215,455	$ 229,827	$ 658,815	$ 684,262
OPERATING EXPENSES
Property operating expenses	74,929	77,484	224,532	232,090
Depreciation and amortization	98,249	97,538	296,414	283,027
General and administrative expenses	8,118	10,595	27,922	31,922
Investment management expenses	2,819	1,581	5,124	4,319
Other expenses, net	17,571	4,002	23,452	12,759
Total operating expenses	201,686	191,200	577,444	564,117
Interest income	3,041	2,824	10,407	8,615
Interest expense	(50,519)	(42,011)	(140,657)	(122,961)
Gain on dispositions of real estate	0	1,146	47,204	356,929
Mezzanine / Unconsolidated partnerships investment income, net	6,870	0	20,553	0
(Loss) income before income tax benefit	(26,562)	874	19,507	363,319
Income tax benefit	1,747	3,096	7,859	1,942
Net (loss) income	(24,815)	3,970	27,366	365,261
Noncontrolling interests:
Net loss (income) attributable to noncontrolling interests in consolidated real estate partnerships	154	58	153	(103)
Net income attributable to preferred noncontrolling interests in Aimco Operating Partnership	(1,687)	(1,933)	(5,415)	(13,135)
Net income attributable to the company	(24,661)	4,028	27,519	365,158
Net (income) loss attributable to participating securities	(39)	43	(125)	(429)
Net income attributable to the company's common equity holders	$ (26,387)	$ 2,138	$ 21,979	$ 351,594
Net income attributable to Aimco per common share – basic and diluted	$ (0.17)	$ 0.01	$ 0.14	$ 2.26
Weighted average common shares/units outstanding - basic	156,508	156,618	156,559	155,644
Weighted average common shares/units outstanding - diluted	156,508	156,879	156,692	155,971
Unconsolidated Real Estate Partnerships [Member]
OPERATING EXPENSES
Mezzanine / Unconsolidated partnerships investment income, net	$ 277	$ 288	$ 629	$ 591
Unconsolidated Real Estate Partnerships [Member] | AIMCO Properties, LP [Member]
OPERATING EXPENSES
Mezzanine / Unconsolidated partnerships investment income, net	$ 277	$ 288	$ 629	$ 591