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Significant Transactions (Details Textual)
$ in Thousands
12 Months Ended
Sep. 08, 2020
USD ($)
apartment_home
Multi_family_apartment
$ / Home
Aug. 25, 2020
USD ($)
Dec. 31, 2020
USD ($)
Property
apartment_home
Dec. 31, 2019
USD ($)
Property
apartment_home
Dec. 31, 2018
USD ($)
Property
apartment_home
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]          
Number of apartment communities | Multi_family_apartment 12        
Number of apartment homes in apartment communities | apartment_home 4,051        
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures $ 2,400,000        
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | $ / Home 592,000        
Secured term loan $ 1,220,000        
Implied equity value contributed by communities 1,180,000        
Investment owned amount $ 461,000        
Gain on dispositions of real estate and the Asset Management business     $ 119,215 $ 503,168 $ 677,463
Wholly And Partially Owned Consolidated Properties | Disposal Group, Disposed of by Sale, Not Discontinued Operations          
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]          
Number of apartment communities | Property     2 12 4
Number of apartment homes in apartment communities | apartment_home     485 3,596 1,334
Payments to acquire businesses   $ 89,600      
Gross proceeds from the sale of real estate         $ 590,000
Gain on dispositions of real estate and the Asset Management business [1]     $ 119,215 $ 503,168 175,213
Net proceeds to Aimco from the sale of real estate         512,200
Wholly And Partially Owned Consolidated Properties | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Asset Management Business [Member]          
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]          
Gain on dispositions of real estate and the Asset Management business         500,300
Wholly And Partially Owned Consolidated Properties | Disposal Group, Disposed of by Sale, Not Discontinued Operations | La Jolla Cove [Member]          
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]          
Stated value of seller financing provided         48,600
Net cash proceeds received         $ 5,000
Ownership Exchanged          
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]          
Joint venture ownership percentage 39.00%        
Ownership Retained          
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]          
Joint venture ownership percentage retained 61.00%        
[1]

(1)

During the year ended December 31, 2019, gain on dispositions of real estate includes the gain recognized upon the expiration of indemnification liabilities related to the sale of our Asset Management business.