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Commitments and Contingencies (UNITED DOMINION REALTY, L.P.) Commitments and Contingencies (Details) - Jun. 30, 2015
$ in Thousands
USD ($)
Communities
Loss Contingencies [Line Items]  
Number of communities owned (in communities) | Communities 136
Cost Incurred to Date $ 647,838
Expected Costs to Complete $ 436,828
United Dominion Reality L.P. [Member]  
Loss Contingencies [Line Items]  
Number of communities owned (in communities) | Communities 67
Wholly owned — redevelopment [Member]  
Loss Contingencies [Line Items]  
Capital Expenditures Incurred but Not yet Paid $ 1,300
Number of communities owned (in communities) 1
Cost Incurred to Date $ 4,854
Expected Costs to Complete 10,146
Wholly owned — redevelopment [Member] | United Dominion Reality L.P. [Member]  
Loss Contingencies [Line Items]  
Capital Expenditures Incurred but Not yet Paid $ 1,300
Number of communities owned (in communities) 1
Cost Incurred to Date $ 4,854
Expected Costs to Complete 10,146
Wholly owned — under development [Member]  
Loss Contingencies [Line Items]  
Capital Expenditures Incurred but Not yet Paid $ 100
Number of communities owned (in communities) 1
Cost Incurred to Date $ 92,645
Expected Costs to Complete $ 249,355