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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, 2017
USD ($)
community
entity
home
ft²
Sep. 30, 2017
USD ($)
entity
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
community
entity
home
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Equity method investment            
Gain on sale of communities   $ 107,067 $ 0 $ 136,514 $ 180,256  
Gain (Loss) on Extinguishment of Debt   0 $ 0 (24,162) (2,461)  
Equity method investment, difference between carrying amount and underlying equity $ 35,752 $ 35,752   35,752   $ 38,015
Number of communities acquired | community 2          
Payments to Acquire Other Real Estate       $ 228,011 $ 393,916  
Sudbury            
Equity method investment            
Equity method investment, ownership percentage 60.00% 60.00%   60.00%    
Land $ 19,200 $ 19,200   $ 19,200    
Unconsolidated real estate entities            
Equity method investment            
Number of unconsolidated real estate entities | entity 5 5   5    
Avalon Bay Value Added Fund II LP            
Equity method investment            
Equity method investment, ownership percentage 31.30% 31.30%   31.30%    
Number of Apartment Communities Sold | community       3    
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   $ 19,977   $ 26,742    
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 $ 41,485 $ 41,485   $ 41,485    
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 31.30% 31.30%   31.30%    
The Lodge Denver West            
Equity method investment            
Number of apartment homes, acquired | home 252          
Payments to Acquire Other Real Estate $ 76,750          
Avalon Dunn Loring            
Equity method investment            
Number of apartment homes, acquired | home 440          
Retail square feet acquired | ft² 27,000          
Payments to Acquire Other Real Estate $ 151,000          
Eaves Gaithersburg | Avalon Bay Value Added Fund II LP            
Equity method investment            
Number of Apartment Homes Sold | home       684    
Proceeds from Sale of Real Estate       $ 117,000    
Gain on sale of communities       8,697    
Repayments of secured mortgages       $ 127,179    
Briarwood Apartments | Avalon Bay Value Added Fund II LP            
Equity method investment            
Number of Apartment Homes Sold | home       348    
Proceeds from Sale of Real Estate       $ 64,750    
Gain on sale of communities       $ 7,873    
Avalon Watchung | Avalon Bay Value Added Fund II LP            
Equity method investment            
Number of Apartment Homes Sold | home       334    
Proceeds from Sale of Real Estate       $ 90,300    
Gain on sale of communities       $ 9,752    
Eaves Sunnyvale | US Fund            
Equity method investment            
Number of Apartment Homes Sold | home       192    
Proceeds from Sale of Real Estate       $ 107,000    
Gain on sale of communities       13,788    
Repayments of secured mortgages       32,542    
Gain (Loss) on Extinguishment of Debt       $ 406