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Real Estate Owned (UNITED DOMINION REALTY, L.P.) (Details Textual)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Communities
Dec. 31, 2015
Communities
Dec. 31, 2015
USD ($)
Communities
Dec. 31, 2015
Communities
Apartment_Homes
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Communities
Apartment_Homes
Dec. 31, 2015
Dec. 31, 2015
USD ($)
Dec. 31, 2015
Apartment_Homes
Dec. 31, 2015
States
Real Estate Properties [Line Items]                    
Number of Real Estate Properties 133 133 133 133     2      
Number of States in which Entity Operates             10      
Real Estate Owned (Textual) [Abstract]                    
Number of apartments owned | Apartment_Homes                 40,728  
Number of apartment homes acquired   358                
Development costs excluding direct costs and capitalized interest     $ 6,300   $ 9,000 $ 11,100        
Capitalized Interest Costs, Including Allowance for Funds Used During Construction     16,100   20,200 29,400        
Other Cost and Expense, Operating     9,708   8,271 $ 7,136        
Communities Sold 12 9                
Apartment Homes Sold   2,500   2,735   914        
Proceeds from Sale of Property, Plant, and Equipment     408,700   328,400 $ 81,100        
Gain (Loss) on Disposition of Property Plant Equipment     138,600              
Payments for (Proceeds from) Investments     (387,650)   (383,886) (250,043)        
Gain/(loss) on sales of real estate owned     $ 251,677   143,572 0        
Deferred Gain on Sale of Property         24,700     $ 6,800    
United Dominion Reality L.P.                    
Real Estate Properties [Line Items]                    
Number of Communities Deconsolidated   7                
Number of Real Estate Properties | Communities 57 57 57 57            
Number of States in which Entity Operates | States                   8
Real Estate Owned (Textual) [Abstract]                    
Number of apartments owned | Apartment_Homes                 16,974  
Number of communities acquired apartment homes are within | Communities 1                  
Number of apartment homes acquired   421                
Property, Plant and Equipment, Additions     $ 142,000              
Development costs excluding direct costs and capitalized interest     700   2,000 2,500        
Capitalized Interest Costs, Including Allowance for Funds Used During Construction     200   2,900 5,900        
Other Cost and Expense, Operating     5,923   $ 5,172 $ 5,728        
Communities Sold   5     1 2        
Apartment Homes Sold | Apartment_Homes       1,149   914        
Proceeds from Sale of Property, Plant, and Equipment     250,900   $ 48,700 $ 81,100        
Gain (Loss) on Disposition of Property Plant Equipment         24,400          
Payments for (Proceeds from) Investments     (232,400)   (47,900)          
Gain/(loss) on sales of real estate owned     158,123   63,635 $ 0        
Deferred Gain on Sale of Property         $ 24,622     0    
Unconsolidated Joint Venture Four Texas [Member] | United Dominion Reality L.P.                    
Real Estate Owned (Textual) [Abstract]                    
Communities Sold         2          
Gain (Loss) on Disposition of Property Plant Equipment         $ 39,200          
UDR Lighthouse DownREIT L.P. [Member] | United Dominion Reality L.P.                    
Real Estate Properties [Line Items]                    
Number of Real Estate Properties             13      
Real Estate Owned (Textual) [Abstract]                    
Deferred Gain on Sale of Property               $ 296,400    
UDR Lighthouse DownREIT L.P. [Member] | United Dominion Reality L.P.                    
Real Estate Owned (Textual) [Abstract]                    
Gain/(loss) on sales of real estate owned     $ 133,500