Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
ASSETS
Buildings and improvements	$ 1,107,929	$ 995,116
Land	518,954	505,153
Total real estate	1,626,883	1,500,269
Accumulated depreciation	(527,976)	(495,010)
Net real estate	1,098,907	1,005,259
Cash and cash equivalents	286,066	289,582
Restricted cash	9,167	9,153
Mezzanine investment	322,380	307,362
Right-of-use lease assets	443,460	98,280
Other assets, net	152,159	130,856
Total assets	2,312,139	1,840,492
LIABILITIES AND EQUITY
Non-recourse property debt and term loan, net	542,190	447,967
Construction loans, net	114,309	0
Notes payable to AIR	534,127	534,127
Total indebtedness	1,076,317	982,094
Deferred tax liabilities	128,279	131,560
Lease liabilities	450,648	100,496
Accrued liabilities and other	91,496	62,988
Total liabilities	1,746,740	1,277,138
Redeemable noncontrolling interest in consolidated real estate partnership	4,177	4,263
Commitments and contingencies (Note 4)	0	0
Equity/Partners' Capital:
Common Stock, $0.01 par value, 510,587,500 shares authorized, 149,208,479 and 149,036,263 shares issued/outstanding at March 31, 2021 and December 31, 2020, respectively	1,496	1,490
Additional paid-in capital	517,540	515,127
Accumulated deficit	(16,315)	(16,839)
Total Aimco equity	502,721	499,778
Noncontrolling interests in consolidated real estate partnerships	31,847	31,877
Common noncontrolling interests in Aimco Operating Partnership	26,654	27,436
Total equity	561,222	559,091
Total liabilities and equity	2,312,139	1,840,492
Aimco OP L.P. [Member]
ASSETS
Buildings and improvements	1,107,929	995,116
Land	518,954	505,153
Total real estate	1,626,883	1,500,269
Accumulated depreciation	(527,976)	(495,010)
Net real estate	1,098,907	1,005,259
Cash and cash equivalents	286,066	289,582
Restricted cash	9,167	9,153
Mezzanine investment	322,380	307,362
Right-of-use lease assets	443,460	98,280
Other assets, net	152,159	130,856
Total assets	2,312,139	1,840,492
LIABILITIES AND EQUITY
Non-recourse property debt and term loan, net	427,881	447,967
Notes payable to AIR	534,127	534,127
Total indebtedness	1,076,317	982,094
Deferred tax liabilities	128,279	131,560
Lease liabilities	450,648	100,496
Accrued liabilities and other	91,496	62,988
Total liabilities	1,746,740	1,277,138
Redeemable noncontrolling interest in consolidated real estate partnership	4,177	4,263
Commitments and contingencies (Note 4)
Equity/Partners' Capital:
General Partner and Special Limited Partner	502,721	499,778
Limited Partners	26,654	27,436
Partners’ capital attributable to Aimco Operating Partnership	529,375	527,214
Noncontrolling interests in consolidated real estate partnerships	31,847	31,877
Total partners’ capital	561,222	559,091
Total liabilities and equity	2,312,139	1,840,492
Construction loans, net	114,309
Operating Segments | Operating Portfolio And Other Segment
LIABILITIES AND EQUITY
Non-recourse property debt and term loan, net	$ 427,881	$ 447,967