XML 20 R37.htm IDEA: XBRL DOCUMENT v2.4.0.6
Property Acquisitions, Discontinued Operations, And Assets Held For Sale (Narrative) (Details) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2013
Mar. 31, 2013
acre
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2012
Property Acquisitions, Discontinued Operations, And Assets Held For Sale [Abstract]          
Number of operating properties acquired 1        
Number of apartment units in wholly owned property acquired 356        
Purchase price of operating properties acquired $ 108,500,000        
Number of operating properties sold   1   7 11
Number of apartment homes in operating properties sold 526 770     3,213
Number of assets classified as held for sale   1      
Sales price of assets held for sale sold subsequent to the period end 40,500,000        
Acres of land   3.7      
Sales price of land parcels   6,600,000      
Gain on sale of land   $ 698,000 $ 0