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Real Estate- Narrative (Details)
3 Months Ended 9 Months Ended
Aug. 20, 2021
USD ($)
Aug. 18, 2021
USD ($)
property_unit
May 26, 2021
USD ($)
Sep. 30, 2021
USD ($)
property_unit
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
property_unit
Sep. 30, 2020
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Oct. 01, 2021
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property_unit
Dec. 31, 2020
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Real Estate Properties [Line Items]                  
Number of units in real estate property | property_unit       2,010   2,010      
Sale price       $ 258,600,000   $ 258,600,000     $ 191,029,000
Real estate investment property, net       224,620,000   224,620,000     160,192,000
Gain on sale of real estate       414,000 $ 0 7,693,000 $ 0    
Level 3 | Measurement Input, Market Capitalization Rate | Valuation, Income Approach                  
Real Estate Properties [Line Items]                  
Tangible assets measurement input   0.0475              
Unconsolidated Joint Ventures                  
Real Estate Properties [Line Items]                  
Sale price       968,923,000   968,923,000     1,220,778,000
Real estate investment property, net       824,624,000   824,624,000     $ 1,075,178,000
Gain on sale of real estate       $ 83,984,000 $ 0 $ 83,984,000 $ 0    
Bells Bluff, West Nashville, TN | Unconsolidated Joint Ventures                  
Real Estate Properties [Line Items]                  
Outstanding principal balance   $ 52,000,000              
Bells Bluff, West Nashville, TN | Unconsolidated Joint Ventures | Construction Loans                  
Real Estate Properties [Line Items]                  
Outstanding principal balance   47,043,000              
Bells Bluff, West Nashville, TN | Unconsolidated Joint Ventures | Mortgages payable                  
Real Estate Properties [Line Items]                  
Outstanding principal balance   $ 52,000,000              
Interest rate   3.48%   3.48%   3.48%      
Bells Bluff, West Nashville, TN | VIE | Unconsolidated Joint Ventures | Property Acquisition                  
Real Estate Properties [Line Items]                  
Purchase price   $ 27,860,000              
Bells Bluff, West Nashville, TN | VIE | Unconsolidated Joint Ventures | Property Acquisition | Mortgages payable                  
Real Estate Properties [Line Items]                  
Interest rate   3.48%              
Long-term debt term   10 years              
Bells Bluff, West Nashville, TN | Multi-family | VIE | Unconsolidated Joint Ventures | Property Acquisition                  
Real Estate Properties [Line Items]                  
Additional interest acquired   41.95%              
Interest rate, fixed rate term   20 years              
Number of units in real estate property | property_unit   402              
Crestmont at Thornblade, Greenville, SC | VIE | Unconsolidated Joint Ventures | Property Acquisition | Subsequent Event                  
Real Estate Properties [Line Items]                  
Purchase price               $ 1,570,000  
Crestmont at Thornblade, Greenville, SC | Multi-family | VIE | Unconsolidated Joint Ventures | Property Acquisition | Subsequent Event                  
Real Estate Properties [Line Items]                  
Additional interest acquired               10.00%  
Number of units in real estate property | property_unit               266  
Kendall Manor Houston Texas                  
Real Estate Properties [Line Items]                  
Sale price     $ 16,842,000,000            
Real estate investment property, net     24,500,000,000            
Gain on sale of real estate     7,279,000,000            
Outstanding principal balance     $ 14,260,000,000            
NEW YORK | Cooperative Apartments Unit                  
Real Estate Properties [Line Items]                  
Sale price $ 545,000,000                
Gain on sale of real estate $ 414,000,000