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Debt (UNITED DOMINION REALTY, L.P.) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) Communities | Dec. 31, 2014 USD ($)
Debt Instrument [Line Items] |  |  |
Weighted average interest rate | 3.58% |  |
Debt Instrument Weighted Average Years to Maturity |  | 4 years 29 days |
Fixed Rate Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal outstanding | $ 975,024 | $ 975,024 | $ 969,296
Weighted average interest rate | 5.28% |  |
Debt Instrument Weighted Average Years to Maturity |  | 2 years 6 months 10 days |
Number of Communities Encumbered (in communities) | 28 |  |
Fixed Rate Debt [Member] | Mortgages Notes Payable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate | 5.50% |  |
Debt Instrument Weighted Average Years to Maturity |  | 1 year 20 days |
Number of Communities Encumbered (in communities) | 7 |  |
Fixed Rate Debt [Member] | Fannie Mae credit facilities [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument Weighted Average Years to Maturity |  | 3 years 6 months 14 days |
Number of Communities Encumbered (in communities) | 21 |  |
Variable Rate Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal outstanding | $ 375,415 | $ 375,415 | 392,233
Weighted average interest rate | 1.45% |  |
Debt Instrument Weighted Average Years to Maturity |  | 5 years 3 months |
Number of Communities Encumbered (in communities) | 10 |  |
Variable Rate Debt [Member] | Mortgages Notes Payable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate | 1.94% |  |
Debt Instrument Weighted Average Years to Maturity |  | 1 year 6 months 25 days |
Number of Communities Encumbered (in communities) | 1 |  |
Variable Rate Debt [Member] | Fannie Mae credit facilities [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument Weighted Average Years to Maturity |  | 4 years 9 months 10 days |
Number of Communities Encumbered (in communities) | 7 |  |
Variable Rate Debt [Member] | Tax Exempt Notes Payable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate | 0.84% |  |
Debt Instrument Weighted Average Years to Maturity |  | 7 years 8 months 8 days |
Number of Communities Encumbered (in communities) | 2 |  |
United Dominion Reality L.P. [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal outstanding | $ 912,567 | $ 912,567 | 931,959
Weighted average interest rate |  | 4.43% |
Debt Instrument Weighted Average Years to Maturity |  | 3 years 6 months 14 days |
Number of Communities Encumbered (in communities) | Communities |  | 20 |
United Dominion Reality L.P. [Member] | Fixed Rate Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal outstanding | 708,058 | $ 708,058 | 712,199
Weighted average interest rate |  | 5.21% |
Debt Instrument Weighted Average Years to Maturity |  | 2 years 6 months |
Number of Communities Encumbered (in communities) | Communities |  | 14 |
United Dominion Reality L.P. [Member] | Fixed Rate Debt [Member] | Mortgages Notes Payable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal outstanding | 374,056 | $ 374,056 | 378,371
Weighted average interest rate |  | 5.49% |
Debt Instrument Weighted Average Years to Maturity |  | 1 year 1 month 6 days |
Number of Communities Encumbered (in communities) | Communities |  | 5 |
United Dominion Reality L.P. [Member] | Fixed Rate Debt [Member] | Fannie Mae credit facilities [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate |  | 4.90% |
Debt Instrument Weighted Average Years to Maturity |  | 4 years 25 days |
Number of Communities Encumbered (in communities) | Communities |  | 9 |
United Dominion Reality L.P. [Member] | Variable Rate Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal outstanding | 204,509 | $ 204,509 | 219,760
Weighted average interest rate |  | 1.74% |
Debt Instrument Weighted Average Years to Maturity |  | 7 years 1 month 17 days |
Number of Communities Encumbered (in communities) | Communities |  | 6 |
United Dominion Reality L.P. [Member] | Variable Rate Debt [Member] | Fannie Mae credit facilities [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate |  | 1.88% |
Debt Instrument Weighted Average Years to Maturity |  | 5 years 8 months 1 day |
Number of Communities Encumbered (in communities) | Communities |  | 5 |
United Dominion Reality L.P. [Member] | Variable Rate Debt [Member] | Tax Exempt Notes Payable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal outstanding | 27,000 | $ 27,000 | 27,000
Weighted average interest rate |  | 0.85% |
Debt Instrument Weighted Average Years to Maturity |  | 16 years 8 months 19 days |
Number of Communities Encumbered (in communities) | Communities |  | 1 |
Fannie Mae credit facilities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Rate Debt [Member] | Fannie Mae credit facilities [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal outstanding | 566,288 | $ 566,288 | 568,086
Fannie Mae credit facilities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Variable Rate Debt [Member] | Fannie Mae credit facilities [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal outstanding | 249,378 | 249,378 | 266,196
Fannie Mae credit facilities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | United Dominion Reality L.P. [Member] | Fixed Rate Debt [Member] | Fannie Mae credit facilities [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal outstanding | 334,002 | 334,002 | 333,828
Fannie Mae credit facilities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | United Dominion Reality L.P. [Member] | Variable Rate Debt [Member] | Fannie Mae credit facilities [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal outstanding | $ 177,509 | $ 177,509 | $ 192,760

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