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Property Acquisitions, Discontinued Operations, And Assets Held For Sale (Narrative) (Details) (USD $)
 0 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended
Nov. 02, 2012
acre
Oct. 31, 2012
Jan. 31, 2012
Dec. 31, 2011
Sep. 30, 2012
acre
Jun. 30, 2012
acre
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Property Acquisitions, Discontinued Operations, And Assets Held For Sale [Abstract]                      
Acres of land acquired 2.4       12.0 4.7          
Purchase price of land acquired $ 9,000,000       $ 3,300,000 $ 13,400,000          
Statement [Line Items]                      
Number of apartment units in wholly owned property acquired     4,034   253            
Equity method investment ownership percentage       20.00% 25.00%     20.00%   25.00%  
Number of unconsolidated equity method investments acquired     12                
Percentage of voting interests acquired     80.00%   75.00%         75.00%  
Cash consideration     99,500,000                
Debt assumed     272,600,000                
Gain on acquisition of controlling interest in joint ventures     40,200,000   0       0 40,191,000 0
Pro Forma Property Revenues of Acquiree since Acquisition Date, Actual                   35,300,000  
Pro Forma Property Expenses of Acquiree since Acquisition Date, Actual                   14,300,000  
Amount payable for purchase of noncontrolling interest         10,200,000         10,241,000 0
Number of operating properties sold       2 1   3 4      
Number of apartment homes in operating properties sold   473   788 253   1,033        
Number of assets classified as held for sale         2         2  
Sales price of assets held for sale sold subsequent to the period end   26,600,000                  
Dallas Texas [Member]
                      
Statement [Line Items]                      
Number of apartment units in wholly owned property acquired         106 477          
Purchase price of operating properties acquired         19,200,000 76,000,000          
Atlanta Georgia [Member]
                      
Statement [Line Items]                      
Number of apartment units in wholly owned property acquired         223            
Purchase price of operating properties acquired         25,300,000            
Ontario California [Member]
                      
Statement [Line Items]                      
Number of apartment units in wholly owned property acquired         469            
Purchase price of operating properties acquired         $ 90,500,000