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Investments in Real Estate Entities (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
entity
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
community
entity
home
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Investment in Real Estate Entities          
Number of Apartment Communities Sold | community     5    
Gain on sale of communities $ 0 $ 66,410 $ 180,256 $ 98,899  
Gains (Losses) on Extinguishment of Debt 0 18,987 (2,461) 26,736  
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity 38,485   38,485   $ 40,978
Other than Temporary Impairment Losses, Investments $ 0 $ 0 $ 0 $ 0  
Unconsolidated real estate entities          
Investment in Real Estate Entities          
Number of unconsolidated real estate entities | entity 5   5    
Unconsolidated real estate entities | Minimum          
Investment in Real Estate Entities          
Equity Method Investment, Ownership Percentage 20.00%   20.00%    
Unconsolidated real estate entities | Maximum          
Investment in Real Estate Entities          
Equity Method Investment, Ownership Percentage 31.30%   31.30%    
Avalon Bay Value Added Fund II LP [Member]          
Investment in Real Estate Entities          
Equity Method Investment, Ownership Percentage 31.30%   31.30%    
Number of Apartment Communities Sold | community     2    
Repayments of secured mortgages     $ 127,191    
Gains (Losses) on Extinguishment of Debt     $ 1,670    
Percentage of Right of Distribution 20.00%   20.00%    
Percentage of Right of Remaining Distribution 80.00%   80.00%    
Proceeds from Equity Method Investment, Dividends or Distributions $ 3,447        
Avalon Bay Value Added Fund II LP [Member] | Eaves Rancho San Diego [Member]          
Investment in Real Estate Entities          
Number of apartment homes sold | home     676    
Proceeds from sale of real estate     $ 158,000    
Gain on sale of communities     $ 13,057    
Avalon Bay Value Added Fund II LP [Member] | Eaves Tustin [Member]          
Investment in Real Estate Entities          
Number of apartment homes sold | home     628    
Proceeds from sale of real estate     $ 163,550    
Gain on sale of communities     $ 23,547    
US Fund [Member]          
Investment in Real Estate Entities          
Number of Apartment Communities Sold | community     2    
Repayments of secured mortgages     $ 94,822    
Gains (Losses) on Extinguishment of Debt     $ 2,003    
US Fund [Member] | Archstone Boca Town Center [Member]          
Investment in Real Estate Entities          
Number of apartment homes sold | home     252    
Proceeds from sale of real estate     $ 56,300    
Gain on sale of communities     $ 4,120    
US Fund [Member] | Avalon Kips Bay [Member]          
Investment in Real Estate Entities          
Number of apartment homes sold | home     209    
Proceeds from sale of real estate     $ 173,000    
Gain on sale of communities     12,448    
Funds [Member]          
Investment in Real Estate Entities          
Gains (Losses) on Extinguishment of Debt     $ 12,344