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Investments in Real Estate Entities (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
community
entity
home
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Investment in Real Estate Entities      
Number of Apartment Communities Sold | community 1    
Gain on sale of communities $ 103,321 $ 32,490  
Long-term Debt $ 6,528,834   $ 6,481,291
Unconsolidated real estate entities      
Investment in Real Estate Entities      
Number of unconsolidated real estate entities | entity 5    
Unconsolidated real estate entities | Minimum      
Investment in Real Estate Entities      
Ownership interest percentage 20.00%    
Unconsolidated real estate entities | Maximum      
Investment in Real Estate Entities      
Ownership interest percentage 31.30%    
Avalon Bay Value Added Fund II LP [Member]      
Investment in Real Estate Entities      
Repayments of secured mortgages $ 68,091    
Gains (Losses) on Extinguishment of Debt $ 1,207    
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    
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