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Real Estate Owned (Details Textual) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2014
Apartment_Homes
States
Communities
Sep. 30, 2014
States
Communities
Apartment_Homes
Sep. 30, 2013
Apartment_Homes
Sep. 30, 2014
States
Communities
Apartment_Homes
Sep. 30, 2013
Apartment_Homes
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
New York Properties [Member]
Sep. 30, 2014
United Dominion Reality L.P. [Member]
Apartment_Homes
States
Communities
Sep. 30, 2013
United Dominion Reality L.P. [Member]
Sep. 30, 2014
United Dominion Reality L.P. [Member]
Apartment_Homes
States
Communities
Sep. 30, 2013
United Dominion Reality L.P. [Member]
Sep. 30, 2013
United Dominion Reality L.P. [Member]
Dec. 31, 2013
United Dominion Reality L.P. [Member]
Dec. 31, 2012
United Dominion Reality L.P. [Member]
Sep. 30, 2014
United Dominion Reality L.P. [Member]
New York Properties [Member]
Sep. 30, 2014
Operating Community [Member]
Sep. 30, 2014
Operating Community [Member]
Sep. 30, 2014
Operating Community [Member]
Unconsolidated Joint Venture Four Texas [Member]
Communities
Sep. 30, 2014
Operating Community [Member]
United Dominion Reality L.P. [Member]
Sep. 30, 2014
Development Community [Member]
Unconsolidated Joint Venture Vitruvian Park [Member]
Communities
Mar. 31, 2014
Land [Member]
Sep. 30, 2014
Land [Member]
Sep. 30, 2014
Land [Member]
Unconsolidated Joint Venture Vitruvian Park [Member]
Sep. 30, 2014
Lightbox [Member]
Sep. 30, 2014
Land [Member]
Sep. 30, 2014
Waterscape [Member]
Sep. 30, 2014
Grandview [Member]
Real Estate Properties [Line Items]                                                        
Communities Held For Sale 1 1   1                                                
Real Estate Owned (Textual) [Abstract]                                                        
Number of states in which there are owned and consolidated communities 10 10   10         9   9                                  
Number of apartment homes owned and consolidated by the Company 40,477 40,477   40,477         20,753   20,753                                  
Joint Venture and Partnership Number of Operating Communities Owned 141 141   141         67   67               8   1     6        
Development costs excluding direct costs and capitlized interest   $ 1,720,000 $ 2,400,000 $ 7,230,000 $ 8,500,000       $ 496,000 $ 618,000 $ 1,793,000   $ 2,000,000                              
Interest capitalized during period   5,200,000 6,600,000 15,400,000 23,200,000       800,000 1,700,000 2,800,000   4,400,000                              
Number of Apartments Owned       1,904   914               914                            
Impairment of Long-Lived Assets Held-for-use               0               0                        
Other Cost and Expense, Operating   2,009,000 1,775,000 6,097,000 5,211,000       1,484,000 1,405,000 4,371,000   4,215,000                              
Property, Plant and Equipment, Additions       129,400,000                                         45,500,000 77,800,000 75,200,000  
Proceeds from Sale of Property, Plant, and Equipment       237,700,000             48,700,000                                  
Payments for (Proceeds from) Investments       233,913,000 140,834,000           47,922,000   0                              
Gains/(loss) on sales of real estate, net of tax   31,302,000 0 82,305,000 0       0 0 40,687,000   0                              
Gain (Loss) on Disposition of Property Plant Equipment   100,000   82,400,000             24,400,000           31,300,000 81,200,000   39,600,000   1,100,000 1,100,000         100,000
Communities Sold       6 0 2         1 0 0 2       1                   1
Number of Communities Acquired 2 2                                                    
Number of Apartment Homes Acquired 0 358 0   0                                              
Casualty-related (recoveries)/charges, net                 0 (3,807,000)                                    
Casualty (Recoveries)/Charges   $ 0 $ 6,460,000 $ (500,000) $ 12,253,000   $ (12,253,000)   $ 0 $ 3,807,000 $ (500,000)   $ 8,083,000   $ (8,083,000)