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Commitments and Contingencies (UNITED DOMINION REALTY, L.P.) Commitments and Contingencies (Details) (USD $)
 9 Months Ended
Sep. 30, 2014
property
Loss Contingencies [Line Items]  
Number of communities owned (in communities) 141
Cost Incurred to Date $ 605,034,000
United Dominion Reality L.P. [Member]
  
Loss Contingencies [Line Items]  
Number of communities owned (in communities) 67
Wholly owned — redevelopment [Member]
  
Loss Contingencies [Line Items]  
Capital Expenditures Incurred but Not yet Paid 2,100,000
Number of communities owned (in communities) 1
Cost Incurred to Date 80,619,000
Wholly owned — under development [Member]
  
Loss Contingencies [Line Items]  
Capital Expenditures Incurred but Not yet Paid 26,800,000
Number of communities owned (in communities) 3
Cost Incurred to Date 321,607,000
Wholly owned — under development [Member] | United Dominion Reality L.P. [Member]
  
Loss Contingencies [Line Items]  
Capital Expenditures Incurred but Not yet Paid 7,000,000
Number of communities owned (in communities) 1
Cost Incurred to Date 119,828,000
Expected Costs to Complete $ 12,172,000