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Commitments and Contingencies (UNITED DOMINION REALTY, L.P.) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
Communities
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2015
Dec. 31, 2015
USD ($)
Real Estate Properties [Line Items]          
Number of Real Estate Properties 133     2  
Costs Incurred to Date         $ 859,798
Expected Costs to Complete [1]         319,316
United Dominion Reality L.P.          
Real Estate Properties [Line Items]          
Development costs and capital expenditures Incurred but not yet paid $ 3,118 $ 7,254 $ 6,371    
Number of Real Estate Properties | Communities 57        
Ground Leases [Member]          
Real Estate Properties [Line Items]          
Number of Real Estate Properties | Communities 6        
2015         5,444
2016         5,444
2017         4,486
2018         5,444
2019         5,444
Thereafter         311,858
Rent expense $ 5,500 5,400 5,200    
Ground Leases [Member] | United Dominion Reality L.P.          
Real Estate Properties [Line Items]          
Number of Real Estate Properties | Communities 5        
2015         5,400
2016         5,400
2017         4,500
2018         5,400
2019         5,400
Thereafter         311,900
Rent expense $ 5,400 $ 5,300 $ 5,100    
Wholly-owned — redevelopment          
Real Estate Properties [Line Items]          
Development costs and capital expenditures Incurred but not yet paid 1,200        
Number of Real Estate Properties       3  
Costs Incurred to Date         11,302
Purchase Commitment, Remaining Minimum Amount Committed         16,698
Wholly-owned — redevelopment | United Dominion Reality L.P.          
Real Estate Properties [Line Items]          
Development costs and capital expenditures Incurred but not yet paid $ 700        
Number of Real Estate Properties       2  
Costs Incurred to Date         10,093
Purchase Commitment, Remaining Minimum Amount Committed         $ 13,907
[1] Represents 100% of project costs incurred to date.