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Debt (UNITED DOMINION REALTY, L.P.) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  |  |  |  |
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Sep. 30, 2014 | Sep. 30, 2014 Fixed Rate Debt [Member] Communities | Dec. 31, 2013 Fixed Rate Debt [Member] | Sep. 30, 2014 Fixed Rate Debt [Member] Mortgages Notes Payable [Member] Communities | Dec. 31, 2013 Fixed Rate Debt [Member] Mortgages Notes Payable [Member] | Sep. 30, 2014 Fixed Rate Debt [Member] Fannie Mae credit facilities [Member] Communities | Dec. 31, 2013 Fixed Rate Debt [Member] Fannie Mae credit facilities [Member] | Sep. 30, 2014 Variable Rate Debt [Member] Communities | Dec. 31, 2013 Variable Rate Debt [Member] | Sep. 30, 2014 Variable Rate Debt [Member] Mortgages Notes Payable [Member] Communities | Dec. 31, 2013 Variable Rate Debt [Member] Mortgages Notes Payable [Member] | Sep. 30, 2014 Variable Rate Debt [Member] Fannie Mae credit facilities [Member] Communities | Dec. 31, 2013 Variable Rate Debt [Member] Fannie Mae credit facilities [Member] | Sep. 30, 2014 Variable Rate Debt [Member] Tax Exempt Notes Payable [Member] Communities | Dec. 31, 2013 Variable Rate Debt [Member] Tax Exempt Notes Payable [Member] | Sep. 30, 2014 United Dominion Reality L.P. [Member] Communities | Dec. 31, 2013 United Dominion Reality L.P. [Member] | Sep. 30, 2014 United Dominion Reality L.P. [Member] Fixed Rate Debt [Member] Communities | Dec. 31, 2013 United Dominion Reality L.P. [Member] Fixed Rate Debt [Member] | Sep. 30, 2014 United Dominion Reality L.P. [Member] Fixed Rate Debt [Member] Mortgages Notes Payable [Member] Communities | Dec. 31, 2013 United Dominion Reality L.P. [Member] Fixed Rate Debt [Member] Mortgages Notes Payable [Member] | Sep. 30, 2014 United Dominion Reality L.P. [Member] Fixed Rate Debt [Member] Fannie Mae credit facilities [Member] Communities | Sep. 30, 2014 United Dominion Reality L.P. [Member] Variable Rate Debt [Member] Communities | Dec. 31, 2013 United Dominion Reality L.P. [Member] Variable Rate Debt [Member] | Sep. 30, 2014 United Dominion Reality L.P. [Member] Variable Rate Debt [Member] Fannie Mae credit facilities [Member] Communities | Sep. 30, 2014 United Dominion Reality L.P. [Member] Variable Rate Debt [Member] Tax Exempt Notes Payable [Member] Communities | Dec. 31, 2013 United Dominion Reality L.P. [Member] Variable Rate Debt [Member] Tax Exempt Notes Payable [Member] | Sep. 30, 2014 Line of Credit [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] Fair Value, Measurements, Recurring [Member] Variable Rate Debt [Member] Fannie Mae credit facilities [Member] | Sep. 30, 2014 Line of Credit [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] | Dec. 31, 2013 Line of Credit [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] | Sep. 30, 2014 Line of Credit [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] | Dec. 31, 2013 Line of Credit [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 |  | $ 1,061,926 | $ 1,072,373 | $ 438,172 | $ 445,706 |  | $ 626,667 | $ 337,446 | $ 369,704 | $ 31,337 | $ 63,595 | $ 211,409 | $ 211,409 | $ 94,700 | $ 94,700 | $ 928,273 | $ 934,865 | $ 759,215 | $ 765,806 | $ 380,506 | $ 386,803 |  | $ 169,058 | $ 169,059 |  | $ 27,000 | $ 27,000 | $ 211,409 | $ 378,709 | $ 379,003 | $ 142,058 | $ 142,059
Weighted average interest rate | 3.98% | 5.19% |  | 5.47% |  |  |  | 1.39% |  | 1.94% |  |  |  | 0.77% |  | 4.47% |  | 5.09% |  | 5.46% |  |  | 1.70% |  |  |  |  |  |  |  |  |
Number of Communities Encumbered (in communities) |  | 30 |  | 8 |  | 22 |  | 10 |  | 1 |  | 7 |  | 2 |  | 21 |  | 15 |  | 5 |  | 10 | 6 |  | 5 | 1 |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  |  |  | 4.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.71% |  |  | 1.88% |  |  |  |  |  |  |
Debt Instrument, Interest Rate at Period End |  |  |  |  |  |  |  |  |  |  |  | 1.58% |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.74% |  |  |  |  |  |

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