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Discontinued Operations (UNITED DOMINION REALTY, L.P.) (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Communities
Mar. 31, 2012
Communities
Apartment_Homes
Discontinued Operations (Textual) [Abstract]    
Communities sold (in communities) 0 6
Communities held for sale (in communities) 0  
Summary of income from discontinued operations    
Rental income $ 0 $ 17,101,000
Rental expenses 0 5,929,000
Property management fee 0 470,000
Real estate depreciation 0 6,340,000
Total expenses 0 12,739,000
Income before net gain on the sale of property 0 4,362,000
Net (loss)/gain on the sale of property 0 80,525,000
Income from discontinued operations 0 84,887,000
Discontinued operations, communities sold (in communities)   14
Discontinued operations, apartment homes sold (in apartment homes)   4,918
United Dominion Reality L.P. [Member]
    
Discontinued Operations (Textual) [Abstract]    
Communities sold (in communities) 0 0
Communities held for sale (in communities) 0  
Summary of income from discontinued operations    
Rental income 0 3,373,000
Rental expenses 0 1,069,000
Property management fee 0 93,000
Real estate depreciation 0 1,205,000
Total expenses 0 2,367,000
Income before net gain on the sale of property 0 1,006,000
Net (loss)/gain on the sale of property 0 (84,000)
Income from discontinued operations $ 0 $ 922,000
Discontinued operations, communities sold (in communities)   4
Discontinued operations, apartment homes sold (in apartment homes)   1,314