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Real Estate Owned (UNITED DOMINION REALTY, L.P.) (Details Textual)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Communities
Apartment_Homes
States
$ / shares
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Communities
Apartment_Homes
States
$ / shares
Jun. 30, 2014
USD ($)
Jun. 30, 2013
USD ($)
Dec. 31, 2014
USD ($)
Real Estate Owned (Textual) [Abstract]            
Number of communities owned (in communities) | Communities 136   136      
Number of states operating within (in states) 10   10      
Number of apartments owned (in apartments homes) | Apartment_Homes 39,404   39,404      
Number of communities acquired apartment homes are within | Communities 0          
Development costs excluding direct costs and capitlized interest $ 1,600 $ 2,100 $ 3,800 $ 5,500    
Interest capitalized during period 3,800 4,900 8,600 10,200    
Other Cost and Expense, Operating 1,769 2,162 3,535 4,088    
Proceeds from Sale of Property, Plant, and Equipment     109,900      
Gains/(loss) on sales of real estate, net of tax 79,042 26,709 79,042 51,003    
Deferred profit from the sale of properties 6,800   6,800     $ 28,500
Casualty-related (recoveries)/charges, net (843) 0 (1,839) (500)    
Casualty (Recoveries)/Charges $ (843) 0 (1,839) (500)    
Payments for (Proceeds from) Investments     90,543 47,922    
Acquisition of real estate     $ 24,067 0    
Communities Sold | Communities     3      
Apartment Homes Sold | Apartment_Homes     812      
United Dominion Reality L.P. [Member]            
Real Estate Owned (Textual) [Abstract]            
Number of communities owned (in communities) | Communities 67   67      
Number of states operating within (in states) | States 9   9      
Number of apartments owned (in apartments homes) | Apartment_Homes 20,569   20,569      
Development costs excluding direct costs and capitlized interest $ 195 542 $ 328 1,300    
Interest capitalized during period 0 1,000 100 2,000    
Other Cost and Expense, Operating 1,496 1,451 2,986 2,887    
Proceeds from Sale of Property, Plant, and Equipment     45,300      
Gains/(loss) on sales of real estate, net of tax 32,375 16,285 56,998 40,687    
Deferred profit from the sale of properties 0   0     $ 24,622
Casualty-related (recoveries)/charges, net 280 0 873   $ 500  
Casualty (Recoveries)/Charges (280) $ 0 (873) $ (500)    
Payments for (Proceeds from) Investments     $ 27,700      
Communities Sold | Communities     1      
Apartment Homes Sold | Apartment_Homes     240      
Home Acquisition [Member]            
Real Estate Owned (Textual) [Abstract]            
Fair Value of Assets Acquired $ 908,000          
Business Acquisition, Share Price | $ / shares $ 35   $ 35      
Acquisition of real estate $ 90,000          
Cash Acquired from Acquisition $ 65,000          
Number of Properties Purchased 6          
UDR DownREIT Unit [Member] | Home Acquisition [Member]            
Real Estate Owned (Textual) [Abstract]            
Stock Issued During Period, Value, Acquisitions $ 753,000