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Investments in Real Estate Entities - Narrative of Investment in Real Estate Entities (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
entity
home
Sep. 30, 2018
USD ($)
entity
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
entity
home
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Equity method investment            
Equity Method Investment, Realized Gain (Loss) on Disposal   $ 30,597 $ 107,067 $ 30,597 $ 136,514  
Equity method investment, difference between carrying amount and underlying equity $ 34,225 34,225   34,225   $ 35,402
Payments to Acquire Other Real Estate       84,088 228,011  
Gain (Loss) on Extinguishment of Debt   $ (1,678) 0 $ (2,717) (24,162)  
Unconsolidated real estate entities            
Equity method investment            
Number of unconsolidated real estate entities | entity 6 6   6    
Avalon Bay Value Added Fund II LP            
Equity method investment            
Equity Method Investment, Ownership Percentage 31.30% 31.30%   31.30%    
Percentage of right of distribution 40.00% 40.00%   40.00%    
Percentage of right of remaining distribution 60.00% 60.00%   60.00%    
Proceeds from equity method investment, dividends or distributions       $ 925    
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 $ 14,001 $ 14,001   $ 14,001   $ 44,831
Avalon Brooklyn Bay Condominiums [Member]            
Equity method investment            
Variable interest entity, ownership interest by partner       100.00%    
Avalon Brooklyn Bay Rental Apartments [Member]            
Equity method investment            
Variable interest entity, qualitative or quantitative information, ownership percentage       100.00%    
Minimum | Unconsolidated real estate entities            
Equity method investment            
Equity Method Investment, Ownership Percentage 20.00% 20.00%   20.00%    
Maximum [Member] | Unconsolidated real estate entities            
Equity method investment            
Equity Method Investment, Ownership Percentage 55.00% 55.00%   55.00%    
Archstone Toscano [Member]            
Equity method investment            
Proceeds from Legal Settlements   $ (554)        
Avalon Arundel Crossing [Member]            
Equity method investment            
Number of Apartment Homes Acquired | home 310          
Payments to Acquire Other Real Estate $ 83,000          
Avalon Kirkland at Carillon [Member] | US Fund [Member]            
Equity method investment            
Equity Method Investment, Realized Gain (Loss) on Disposal       $ 8,636    
Repayments of secured mortgages       27,928    
Gain (Loss) on Extinguishment of Debt       $ 89    
Number of Apartment Homes Sold | home       131    
Proceeds from sale of real estate       $ 85,500    
Avalon Maplewood [Member]            
Equity method investment            
Gain on Business Interruption Insurance Recovery     3,495   3,495  
Insurance Recoveries     $ 19,696   $ 17,143