Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
REVENUES
Total revenues	$ 224,200	$ 250,187	$ 454,435	$ 497,907
OPERATING EXPENSES
Depreciation and amortization	91,924	97,485	185,489	190,033
General and administrative expenses	12,124	13,882	22,493	25,237
Other expenses, net	4,209	4,366	9,912	7,324
Total operating expenses	184,096	200,826	372,917	395,169
Interest income	3,065	2,884	5,791	5,056
Interest expense	(39,541)	(49,906)	(80,950)	(97,701)
Gain on dispositions of real estate	64,310	310	355,783	53,505
Other, net	231	200	303	424
Income before income tax benefit (expense)	68,169	2,849	362,445	64,022
Income tax benefit (expense)	1,827	4,307	(1,154)	38,824
Net income	69,996	7,156	361,291	102,846
Noncontrolling interests:
Net income attributable to noncontrolling interests in consolidated real estate partnerships	(70)	(45)	(161)	(6,251)
Net income attributable to preferred noncontrolling interests in Aimco Operating Partnership	(1,933)	(1,934)	(3,867)	(3,871)
Net income attributable to common noncontrolling interests in Aimco Operating Partnership	(3,534)	(140)	(18,671)	(3,895)
Net income attributable to noncontrolling interests	(5,537)	(2,119)	(22,699)	(14,017)
Net income attributable to the company	64,459	5,037	338,592	88,829
Net income attributable to the company's preferred equity holders	(5,187)	(2,149)	(7,335)	(4,297)
Net income attributable to participating securities	(38)	(71)	(455)	(190)
Net income attributable to the company's common equity holders	$ 59,234	$ 2,817	$ 330,802	$ 84,342
Net income attributable to the company per common share/unit - basic	$ 0.40	$ 0.02	$ 2.25	$ 0.56
Net income attributable to the company per common share/unit - diluted	$ 0.40	$ 0.02	$ 2.25	$ 0.55
Weighted average common shares/units outstanding - basic	148,367	151,963	146,994	151,918
Weighted average common shares/units outstanding - diluted	148,599	152,093	147,220	152,048
AIMCO Properties, LP [Member]
REVENUES
Total revenues	$ 224,200	$ 250,187	$ 454,435	$ 497,907
OPERATING EXPENSES
Depreciation and amortization	91,924	97,485	185,489	190,033
General and administrative expenses	12,124	13,882	22,493	25,237
Other expenses, net	4,209	4,366	9,912	7,324
Total operating expenses	184,096	200,826	372,917	395,169
Interest income	3,065	2,884	5,791	5,056
Interest expense	(39,541)	(49,906)	(80,950)	(97,701)
Gain on dispositions of real estate	64,310	310	355,783	53,505
Other, net	231	200	303	424
Income before income tax benefit (expense)	68,169	2,849	362,445	64,022
Income tax benefit (expense)	1,827	4,307	(1,154)	38,824
Net income	69,996	7,156	361,291	102,846
Noncontrolling interests:
Net income attributable to noncontrolling interests in consolidated real estate partnerships	(70)	(45)	(161)	(6,251)
Net income attributable to the company	69,926	7,111	361,130	96,595
Net income attributable to the company's preferred equity holders	(7,120)	(4,083)	(11,202)	(8,168)
Net income attributable to participating securities	11	(79)	(472)	(204)
Net income attributable to the company's common equity holders	$ 62,817	$ 2,949	$ 349,456	$ 88,223
Net income attributable to the company per common share/unit - basic and diluted	$ 0.40	$ 0.02	$ 2.25	$ 0.55
Weighted average common shares/units outstanding - basic	156,637	159,709	155,158	159,289
Weighted average common shares/units outstanding - diluted	157,018	159,835	155,517	159,418
Real Estate [Member]
REVENUES
Total revenues	$ 224,200	$ 231,130	$ 454,435	$ 456,523
OPERATING EXPENSES
Property operating expenses	75,839	76,031	155,023	154,318
Real Estate [Member] | AIMCO Properties, LP [Member]
REVENUES
Total revenues	224,200	231,130	454,435	456,523
OPERATING EXPENSES
Property operating expenses	75,839	76,031	155,023	154,318
Asset Management Business [Member]
REVENUES
Total revenues	0	19,057	0	41,384
OPERATING EXPENSES
Property operating expenses	0	9,062	0	18,257
Asset Management Business [Member] | AIMCO Properties, LP [Member]
REVENUES
Total revenues	0	19,057	0	41,384
OPERATING EXPENSES
Property operating expenses	$ 0	$ 9,062	$ 0	$ 18,257