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Investments in Real Estate Entities (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
entity
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
community
home
entity
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Investment in Real Estate Entities          
Number of Apartment Communities Sold | community     2    
Gain on sale of communities $ 66,410,000 $ 327,539,000 $ 98,899,000 $ 333,221,000  
Gains (Losses) on Extinguishment of Debt 18,987,000 $ 0 26,736,000 $ (412,000)  
Long-term Debt $ 6,288,982,000   $ 6,288,982,000   $ 6,448,138,000
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          
Ownership interest percentage 20.00%   20.00%    
Unconsolidated real estate entities | Maximum          
Investment in Real Estate Entities          
Ownership interest percentage 31.30%   31.30%    
Avalon Bay Value Added Fund II LP [Member]          
Investment in Real Estate Entities          
Number of Apartment Communities Sold | community     4    
Repayments of secured mortgages     $ 69,036,000    
Gains (Losses) on Extinguishment of Debt     $ 1,400,000    
Avalon Bay Value Added Fund II LP [Member] | Eaves Plainsboro [Member]          
Investment in Real Estate Entities          
Number of apartment homes sold | home     776    
Proceeds from sale of real estate     $ 117,000,000    
Gain on sale of communities     $ 9,660,000    
Avalon Bay Value Added Fund II LP [Member] | Eaves Los Alisos [Member]          
Investment in Real Estate Entities          
Number of apartment homes sold | home     140    
Proceeds from sale of real estate     $ 39,500,000    
Gain on sale of communities     $ 4,551,000    
Avalon Bay Value Added Fund II LP [Member] | Captain Parker Arms [Member]          
Investment in Real Estate Entities          
Number of apartment homes sold | home     94    
Proceeds from sale of real estate     $ 31,600,000    
Gain on sale of communities     $ 3,385,000    
Avalon Bay Value Added Fund II LP [Member] | Eaves Carlsbad [Member]          
Investment in Real Estate Entities          
Number of apartment homes sold | home     450    
Proceeds from sale of real estate     $ 112,000,000    
Gain on sale of communities     12,130,000    
MVPI LLC [Member]          
Investment in Real Estate Entities          
Payments for (Proceeds from) Other Real Estate Partnerships     $ 20,680,000    
Noncontrolling Interest, Ownership Percentage by Parent 25.00%   25.00%    
Long-term Debt $ 103,000,000   $ 103,000,000    
Fixed rate (as a percent) 3.24%   3.24%    
Secured notes | MVPI LLC [Member]          
Investment in Real Estate Entities          
Repayments of secured mortgages $ 105,000,000