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Investments in Real Estate Entities - Narrative of Investment in Real Estate Entities (Details)
6 Months Ended
Jun. 30, 2019
USD ($)
community
home
entity
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Equity method investment      
Equity method investment, difference between carrying amount and underlying equity $ 30,544,000   $ 31,188,000
Number of Communities Acquired | community 2    
Payments to Acquire Other Real Estate $ 152,260,000 $ 0  
Unconsolidated real estate entities      
Equity method investment      
Number of unconsolidated real estate entities | entity 6    
Avalon Brooklyn Bay      
Equity method investment      
Variable interest entity, qualitative or quantitative information, ownership percentage 70.00%    
Variable interest entity, ownership interest by partner 30.00%    
Due from related parties $ 12,272,000   $ 12,819,000
Avalon Brooklyn Bay Rental Apartments [Member]      
Equity method investment      
Variable interest entity, qualitative or quantitative information, ownership percentage 100.00%    
Avalon Brooklyn Bay Condominiums [Member]      
Equity method investment      
Variable interest entity, ownership interest by partner 100.00%    
Minimum | Unconsolidated real estate entities      
Equity method investment      
Equity Method Investment, Ownership Percentage 20.00%    
Maximum | Unconsolidated real estate entities      
Equity method investment      
Equity Method Investment, Ownership Percentage 55.00%    
Avalon Southlands [Member]      
Equity method investment      
Number of Apartment Homes Acquired | home 338    
Payments to Acquire Other Real Estate $ 91,250,000    
Avalon Cerritos [Member]      
Equity method investment      
Number of Apartment Homes Acquired | home 132    
Payments to Acquire Other Real Estate $ 60,500,000