Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
ASSETS
Total assets	$ 6,255,290	$ 6,079,040
LIABILITIES AND EQUITY
Total liabilities	4,491,265	4,321,750
Preferred noncontrolling interests/Redeemable Preferred Units	101,378	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, 157,326,117 and 157,189,447 shares issued/outstanding at March 31, 2018 and December 31, 2017, respectively	1,573	1,572
Additional paid-in capital	3,885,279	3,900,042
Accumulated other comprehensive income	3,544	3,603
Distributions in excess of earnings	(2,345,206)	(2,367,073)
Total Aimco equity	1,670,190	1,663,144
Noncontrolling interests in consolidated real estate partnerships	(2,755)	(1,716)
Common noncontrolling interests in Aimco Operating Partnership	(4,788)	(5,675)
Total equity	1,662,647	1,655,753
Total liabilities and equity	6,255,290	6,079,040
Asset Management [Member]
ASSETS
Net real estate	220,408	224,873
Cash and cash equivalents	18,374	16,288
Restricted cash	29,764	30,928
Other assets	10,369	15,533
LIABILITIES AND EQUITY
Non-recourse property debt, net	225,502	227,141
Accrued liabilities and other	17,404	19,812
Deferred income	11,814	12,487
Aimco Real Estate [Member]
ASSETS
Buildings and improvements	6,349,549	6,174,149
Land	1,761,238	1,753,604
Total real estate	8,110,787	7,927,753
Accumulated depreciation	(2,596,457)	(2,522,358)
Net real estate	5,514,330	5,405,395
Cash and cash equivalents	51,894	60,498
Restricted cash	38,999	34,827
Other assets	371,152	272,739
Disposal Group, Including Discontinued Operation, Assets	0	17,959
LIABILITIES AND EQUITY
Non-recourse property debt, net	3,700,979	3,545,109
Term loan, net	249,729	249,501
Revolving credit facility borrowings	78,635	67,160
Total indebtedness associated with Real Estate portfolio	4,029,343	3,861,770
Accrued liabilities and other	207,202	200,540
AIMCO Properties, LP [Member]
ASSETS
Total assets	6,255,290	6,079,040
LIABILITIES AND EQUITY
Total liabilities	4,491,265	4,321,750
Preferred noncontrolling interests/Redeemable Preferred Units	101,378	101,537
Commitments and contingencies (Note 4)
Equity/Partners' Capital:
Preferred units	125,000	125,000
General Partner and Special Limited Partner	1,545,190	1,538,144
Limited Partners	(4,788)	(5,675)
Partners’ capital attributable to the Aimco Operating Partnership	1,665,402	1,657,469
Noncontrolling interests in consolidated real estate partnerships	(2,755)	(1,716)
Total partners’ capital	1,662,647	1,655,753
Total liabilities and equity	6,255,290	6,079,040
AIMCO Properties, LP [Member] | Asset Management [Member]
ASSETS
Net real estate	220,408	224,873
Cash and cash equivalents	18,374	16,288
Restricted cash	29,764	30,928
Other assets	10,369	15,533
LIABILITIES AND EQUITY
Non-recourse property debt, net	225,502	227,141
Accrued liabilities and other	17,404	19,812
Deferred income	11,814	12,487
AIMCO Properties, LP [Member] | Aimco Real Estate [Member]
ASSETS
Buildings and improvements	6,349,549	6,174,149
Land	1,761,238	1,753,604
Total real estate	8,110,787	7,927,753
Accumulated depreciation	(2,596,457)	(2,522,358)
Net real estate	5,514,330	5,405,395
Cash and cash equivalents	51,894	60,498
Restricted cash	38,999	34,827
Other assets	371,152	272,739
Disposal Group, Including Discontinued Operation, Assets	0	17,959
LIABILITIES AND EQUITY
Non-recourse property debt, net	3,700,979	3,545,109
Term loan, net	249,729	249,501
Revolving credit facility borrowings	78,635	67,160
Total indebtedness associated with Real Estate portfolio	4,029,343	3,861,770
Accrued liabilities and other	$ 207,202	$ 200,540