Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
REVENUES
Tax credit and transaction revenues	$ 57	$ 2,856	$ 3,576	$ 5,547
Total revenues	250,187	249,092	497,907	495,573
OPERATING EXPENSES
Depreciation and amortization	97,485	89,155	190,033	176,323
General and administrative expenses	13,882	10,108	25,237	21,071
Other expenses, net	4,366	2,650	7,324	4,389
Total operating expenses	200,826	189,386	395,169	378,078
Operating income	49,361	59,706	102,738	117,495
Interest income	2,884	2,012	5,056	4,204
Interest expense	(49,906)	(46,858)	(97,701)	(94,740)
Other, net	200	200	424	665
Income before income taxes and gain on dispositions	2,539	15,060	10,517	27,624
Income tax benefit	4,395	5,023	41,783	10,008
Income before gain on dispositions	6,934	20,083	52,300	37,632
Gain on dispositions of real estate, inclusive of related income tax	222	1,508	50,546	1,114
Net income	7,156	21,591	102,846	38,746
Noncontrolling interests:
Net income attributable to noncontrolling interests in consolidated real estate partnerships	(45)	(813)	(6,251)	(1,764)
Net income attributable to preferred noncontrolling interests in Aimco Operating Partnership	(1,934)	(1,939)	(3,871)	(3,888)
Net income attributable to common noncontrolling interests in Aimco Operating Partnership	(140)	(787)	(3,895)	(1,344)
Net income attributable to noncontrolling interests	(2,119)	(3,539)	(14,017)	(6,996)
Net income attributable to the company	5,037	18,052	88,829	31,750
Net income attributable to the company's preferred equity holders	(2,149)	(2,149)	(4,297)	(4,297)
Net income attributable to participating securities	(71)	(60)	(190)	(119)
Net income attributable to the company's common equity holders	$ 2,817	$ 15,843	$ 84,342	$ 27,334
Earnings attributable to the company per common share/unit
Net income attributable to the company per common share/unit - basic and diluted (in dollars per share/unit)	$ 0.02	$ 0.10	$ 0.54	$ 0.17
Dividends declared per common share/unit	$ 0.38	$ 0.36	$ 0.76	$ 0.72
Weighted average number of shares outstanding - basic	156,703	156,305	156,656	156,282
Weighted average number of shares outstanding - diluted	156,833	156,715	156,786	156,735
Asset Management [Member]
REVENUES
Rental and other property revenues	$ 19,000	$ 18,533	$ 37,808	$ 37,095
OPERATING EXPENSES
Property operating expenses	9,062	8,391	18,257	17,587
Aimco Real Estate [Member]
REVENUES
Rental and other property revenues	231,130	227,703	456,523	452,931
OPERATING EXPENSES
Property operating expenses	76,031	79,082	154,318	158,708
AIMCO Properties, LP [Member]
REVENUES
Tax credit and transaction revenues	57	2,856	3,576	5,547
Total revenues	250,187	249,092	497,907	495,573
OPERATING EXPENSES
Depreciation and amortization	97,485	89,155	190,033	176,323
General and administrative expenses	13,882	10,108	25,237	21,071
Other expenses, net	4,366	2,650	7,324	4,389
Total operating expenses	200,826	189,386	395,169	378,078
Operating income	49,361	59,706	102,738	117,495
Interest income	2,884	2,012	5,056	4,204
Interest expense	(49,906)	(46,858)	(97,701)	(94,740)
Other, net	200	200	424	665
Income before income taxes and gain on dispositions	2,539	15,060	10,517	27,624
Income tax benefit	4,395	5,023	41,783	10,008
Income before gain on dispositions	6,934	20,083	52,300	37,632
Gain on dispositions of real estate, inclusive of related income tax	222	1,508	50,546	1,114
Net income	7,156	21,591	102,846	38,746
Noncontrolling interests:
Net income attributable to noncontrolling interests in consolidated real estate partnerships	(45)	(813)	(6,251)	(1,764)
Net income attributable to the company	7,111	20,778	96,595	36,982
Net income attributable to the company's preferred equity holders	(4,083)	(4,088)	(8,168)	(8,185)
Net income attributable to participating securities	(79)	(63)	(204)	(123)
Net income attributable to the company's common equity holders	$ 2,949	$ 16,627	$ 88,223	$ 28,674
Earnings attributable to the company per common share/unit
Net income attributable to the company per common share/unit - basic (in dollars per share/unit)	$ 0.02	$ 0.10	$ 0.54	$ 0.18
Net income attributable to the company per common share/unit - diluted (in dollars per share/unit)	0.02	0.10	0.54	0.17
Dividends declared per common share/unit	$ 0.38	$ 0.36	$ 0.76	$ 0.72
Weighted average number of shares outstanding - basic	164,685	163,740	164,138	163,777
Weighted average number of shares outstanding - diluted	164,815	164,150	164,268	164,230
AIMCO Properties, LP [Member] | Asset Management [Member]
REVENUES
Rental and other property revenues	$ 19,000	$ 18,533	$ 37,808	$ 37,095
OPERATING EXPENSES
Property operating expenses	9,062	8,391	18,257	17,601
AIMCO Properties, LP [Member] | Aimco Real Estate [Member]
REVENUES
Rental and other property revenues	231,130	227,703	456,523	452,931
OPERATING EXPENSES
Property operating expenses	$ 76,031	$ 79,082	$ 154,318	$ 158,694