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Real Estate Owned (UNITED DOMINION REALTY, L.P.) (Details Textual) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Apartment_Homes
Communities
States
Sep. 30, 2013
Communities
Apartment_Homes
Sep. 30, 2014
Communities
States
Apartment_Homes
Sep. 30, 2013
Apartment_Homes
Dec. 31, 2013
Dec. 31, 2012
Communities
Real Estate Owned (Textual) [Abstract]            
Number of communities owned (in communities) 141   141      
Number of states operating within (in states) 10   10      
Number of apartments owned (in apartments homes) 40,477   40,477      
Number of communities acquired apartment homes are within 0 0 0     0
Number of Apartment Homes Acquired 0 0   0    
Development costs excluding direct costs and capitlized interest 1,720,000 $ 2,400,000 $ 7,230,000 $ 8,500,000    
Interest capitalized during period 5,200,000 6,600,000 15,400,000 23,200,000    
Other Cost and Expense, Operating 2,009,000 1,775,000 6,097,000 5,211,000    
Proceeds from Sale of Property, Plant, and Equipment     237,700,000      
Gains/(loss) on sales of real estate, net of tax 31,302,000 0 82,305,000 0    
Communities Sold     6 0 2  
Casualty (Recoveries)/Charges 0 6,460,000 (500,000) 12,253,000   (12,253,000)
Gain (Loss) on Disposition of Property Plant Equipment 100,000   82,400,000      
Payments for (Proceeds from) Investments     233,913,000 140,834,000    
United Dominion Reality L.P. [Member]
            
Real Estate Owned (Textual) [Abstract]            
Number of communities owned (in communities) 67   67      
Number of states operating within (in states) 9   9      
Number of apartments owned (in apartments homes) 20,753   20,753      
Development costs excluding direct costs and capitlized interest 496,000 618,000 1,793,000 2,000,000    
Interest capitalized during period 800,000 1,700,000 2,800,000 4,400,000    
Other Cost and Expense, Operating 1,484,000 1,405,000 4,371,000 4,215,000    
Proceeds from Sale of Property, Plant, and Equipment     48,700,000      
Gains/(loss) on sales of real estate, net of tax 0 0 40,687,000 0    
Communities Sold     1 0 2  
Casualty-related (recoveries)/charges, net 0 (3,807,000)        
Casualty (Recoveries)/Charges 0 3,807,000 (500,000) 8,083,000   (8,083,000)
Gain (Loss) on Disposition of Property Plant Equipment     24,400,000      
Payments for (Proceeds from) Investments     47,922,000 0    
New York Properties [Member]
            
Real Estate Owned (Textual) [Abstract]            
Impairment of Long-Lived Assets Held-for-use 0          
New York Properties [Member] | United Dominion Reality L.P. [Member]
            
Real Estate Owned (Textual) [Abstract]            
Impairment of Long-Lived Assets Held-for-use $ 0