Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
ASSETS
Total assets	$ 6,544,356	$ 6,079,040
LIABILITIES AND EQUITY
Total liabilities	4,788,239	4,321,750
Preferred noncontrolling interests/Redeemable Preferred Units	101,332	101,537
Commitments and contingencies (Note 4)
Equity/Partners' Capital:
Perpetual Preferred Stock	125,000	125,000
Common Stock, $0.01 par value, 500,787,260 shares authorized, 157,351,428 and 157,189,447 shares issued/outstanding at June 30, 2018 and December 31, 2017, respectively	1,574	1,572
Additional paid-in capital	3,887,260	3,900,042
Accumulated other comprehensive income	3,208	3,603
Distributions in excess of earnings	(2,402,101)	(2,367,073)
Total Aimco equity	1,614,941	1,663,144
Noncontrolling interests in consolidated real estate partnerships	(2,984)	(1,716)
Common noncontrolling interests in Aimco Operating Partnership	42,828	(5,675)
Total equity	1,654,785	1,655,753
Total liabilities and equity	6,544,356	6,079,040
Aimco Real Estate [Member]
ASSETS
Buildings and improvements	6,407,863	6,174,149
Land	1,763,788	1,753,604
Total real estate	8,171,651	7,927,753
Accumulated depreciation	(2,452,947)	(2,522,358)
Net real estate	5,718,704	5,405,395
Cash and cash equivalents	46,703	60,498
Restricted cash	41,117	34,827
Other assets	365,564	272,739
Assets held for sale	94,314	17,959
LIABILITIES AND EQUITY
Non-recourse property debt, net	3,791,238	3,545,109
Term loan, net	249,801	249,501
Revolving credit facility borrowings	220,170	67,160
Total indebtedness associated with Real Estate portfolio	4,261,209	3,861,770
Accrued liabilities and other	216,789	213,027
Liabilities related to assets held for sale	68,610	0
AIMCO Properties, LP [Member]
ASSETS
Total assets	6,544,356	6,079,040
LIABILITIES AND EQUITY
Total liabilities	4,788,239	4,321,750
Preferred noncontrolling interests/Redeemable Preferred Units	101,332	101,537
Commitments and contingencies (Note 4)
Equity/Partners' Capital:
Preferred units	125,000	125,000
General Partner and Special Limited Partner	1,489,941	1,538,144
Limited Partners	42,828	(5,675)
Partners’ capital attributable to the Aimco Operating Partnership	1,657,769	1,657,469
Noncontrolling interests in consolidated real estate partnerships	(2,984)	(1,716)
Total partners’ capital	1,654,785	1,655,753
Total liabilities and equity	6,544,356	6,079,040
AIMCO Properties, LP [Member] | Aimco Real Estate [Member]
ASSETS
Buildings and improvements	6,407,863	6,174,149
Land	1,763,788	1,753,604
Total real estate	8,171,651	7,927,753
Accumulated depreciation	(2,452,947)	(2,522,358)
Net real estate	5,718,704	5,405,395
Cash and cash equivalents	46,703	60,498
Restricted cash	41,117	34,827
Other assets	365,564	272,739
Assets held for sale	94,314	17,959
LIABILITIES AND EQUITY
Non-recourse property debt, net	3,791,238	3,545,109
Term loan, net	249,801	249,501
Revolving credit facility borrowings	220,170	67,160
Total indebtedness associated with Real Estate portfolio	4,261,209	3,861,770
Accrued liabilities and other	216,789	213,027
Liabilities related to assets held for sale	68,610	0
Assets Held-for-sale [Member] | Asset Management [Member]
ASSETS
Net real estate	216,875	224,873
Cash and cash equivalents	20,696	16,288
Restricted cash	30,055	30,928
Other assets	10,328	15,533
LIABILITIES AND EQUITY
Non-recourse property debt, net	224,112	227,141
Accrued liabilities and other	17,519	19,812
Assets Held-for-sale [Member] | AIMCO Properties, LP [Member] | Asset Management [Member]
ASSETS
Net real estate	216,875	224,873
Cash and cash equivalents	20,696	16,288
Restricted cash	30,055	30,928
Other assets	10,328	15,533
LIABILITIES AND EQUITY
Non-recourse property debt, net	224,112	227,141
Accrued liabilities and other	$ 17,519	$ 19,812