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Significant Accounting Policies (UNITED DOMINION REALTY, L.P.) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Accounting Policies [Line Items]      
Deferred Finance Costs, Net   $ 0  
Minimum Percentage of Carrying Value Of Real Estate Portfolio Held By Company 0.1    
Development costs excluding direct costs and capitalized interest $ 6,300 9,000 $ 11,100
Interest capitalized during period 16,100 20,200 29,400
Advertising expense 6,400 6,000 5,700
Secured debt, net $ 1,376,945 1,354,321  
Minimum | Buildings      
Accounting Policies [Line Items]      
Estimated useful lives 35 years    
Minimum | Building improvements      
Accounting Policies [Line Items]      
Estimated useful lives 10 years    
Minimum | Furniture, fixtures, equipment, and other assets      
Accounting Policies [Line Items]      
Estimated useful lives 3 years    
Maximum | Buildings      
Accounting Policies [Line Items]      
Estimated useful lives 55 years    
Maximum | Building improvements      
Accounting Policies [Line Items]      
Estimated useful lives 35 years    
Maximum | Furniture, fixtures, equipment, and other assets      
Accounting Policies [Line Items]      
Estimated useful lives 10 years    
United Dominion Reality L.P.      
Accounting Policies [Line Items]      
Deferred Finance Costs, Net $ (2,199) (4,500)  
Cumulative Adjustment to Net Income Attributable to Noncontrolling Interest   3,300  
Minimum Percentage of Carrying Value Of Real Estate Portfolio Held By Company 0.10    
Development costs excluding direct costs and capitalized interest $ 700 2,000 2,500
Interest capitalized during period 200 2,900 5,900
Advertising expense 2,400 2,500 $ 2,500
Secured debt, net $ 475,964 927,484  
United Dominion Reality L.P. | Minimum | Buildings      
Accounting Policies [Line Items]      
Estimated useful lives 35 years    
United Dominion Reality L.P. | Minimum | Building improvements      
Accounting Policies [Line Items]      
Estimated useful lives 10 years    
United Dominion Reality L.P. | Minimum | Furniture, fixtures, equipment, and other assets      
Accounting Policies [Line Items]      
Estimated useful lives 3 years    
United Dominion Reality L.P. | Maximum | Buildings      
Accounting Policies [Line Items]      
Estimated useful lives 55 years    
United Dominion Reality L.P. | Maximum | Building improvements      
Accounting Policies [Line Items]      
Estimated useful lives 35 years    
United Dominion Reality L.P. | Maximum | Furniture, fixtures, equipment, and other assets      
Accounting Policies [Line Items]      
Estimated useful lives 10 years    
Scenario, Previously Reported [Member]      
Accounting Policies [Line Items]      
Deferred Finance Costs, Net   22,686  
Secured debt, net   1,361,529  
Scenario, Previously Reported [Member] | United Dominion Reality L.P.      
Accounting Policies [Line Items]      
Secured debt, net   $ 931,959