Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
REVENUES
Rental and other property revenues	$ 40,418	$ 37,165	$ 80,222	$ 75,474
OPERATING EXPENSES
Property operating expenses	16,403	15,322	33,345	30,671
Depreciation and amortization	20,639	19,030	41,356	38,377
General and administrative expenses	7,383	1,625	13,694	3,387
Total operating expenses	44,425	35,977	88,395	72,435
Interest expense	(12,638)	(5,809)	(25,315)	(11,460)
Mezzanine investment income, net	7,551	6,936	15,018	13,683
Unrealized gains (losses) on interest rate options	(16,970)	(1,080)	8,377	(1,080)
Other expenses, net	2,918	(154)	3,281	(569)
(Loss) income before income tax benefit	(23,146)	1,081	(6,812)	3,613
Income tax benefit	2,760	2,032	7,860	4,055
Net (loss) income	(20,386)	3,113	1,048	7,668
Noncontrolling interests:
Net (income) loss attributable to redeemable noncontrolling interest in consolidated real estate partnership	(66)	125	86	228
Net (income) attributable to noncontrolling interests in consolidated real estate partnerships	(275)	(10)	(566)	(5)
Net (income) loss attributable to common noncontrolling interests in Aimco Operating Partnership	1,037	(165)	(44)	(400)
Net (loss) income attributable to Aimco common stockholders	$ (19,690)	$ 3,063	$ 524	$ 7,491
Net (loss) income attributable to Aimco per common share – basic	$ (0.13)	$ 0.02	$ 0.00	$ 0.05
Net (loss) income attributable to Aimco per common share – diluted	$ (0.13)	$ 0.02	$ 0.00	$ 0.05
Weighted average common shares/units outstanding - basic	149,166	148,549	149,082	148,549
Weighted average common shares/units outstanding - diluted	149,166	148,569	149,442	148,569
Aimco OP L.P. [Member]
REVENUES
Rental and other property revenues	$ 40,418	$ 37,165	$ 80,222	$ 75,474
OPERATING EXPENSES
Property operating expenses	16,403	15,322	33,345	30,671
Depreciation and amortization	20,639	19,030	41,356	38,377
General and administrative expenses	7,383	1,625	13,694	3,387
Total operating expenses	44,425	35,977	88,395	72,435
Interest expense	(12,638)	(5,809)	(25,315)	(11,460)
Mezzanine investment income, net	7,551	6,936	15,018	13,683
Unrealized gains (losses) on interest rate options	(16,970)	(1,080)	8,377	(1,080)
Other expenses, net	2,918	(154)	3,281	(569)
(Loss) income before income tax benefit	(23,146)	1,081	(6,812)	3,613
Income tax benefit	2,760	2,032	7,860	4,055
Net (loss) income	(20,386)	3,113	1,048	7,668
Noncontrolling interests:
Net (income) loss attributable to redeemable noncontrolling interest in consolidated real estate partnership	(66)	125	86	228
Net (income) attributable to noncontrolling interests in consolidated real estate partnerships	(275)	(10)	(566)	(5)
Net (loss) income attributable to Aimco common stockholders	$ (20,727)	$ 3,228	$ 568	$ 7,891
Net (loss) income attributable to Aimco per common share – basic	$ (0.13)	$ 0.02	$ 0.00	$ 0.05
Net (loss) income attributable to Aimco per common share – diluted	$ (0.13)	$ 0.02	$ 0.00	$ 0.05
Weighted average common shares/units outstanding - basic	157,134	156,480	157,093	156,480
Weighted average common shares/units outstanding - diluted	157,134	156,500	157,453	156,500