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Debt (UNITED DOMINION REALTY, L.P.) (Details 1) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011
Debt Instrument [Line Items] |  |
Borrowings outstanding | $ 800,000 |
Fannie Mae [Member] |  |
Debt Instrument [Line Items] |  |
Borrowings outstanding | 843,980 | 1,054,960
Weighted average daily borrowings during the period ended | 964,520 | 1,139,588
Maximum daily borrowings during the period ended | 1,054,735 | 1,157,557
Weighted average interest rate during the period ended | 4.30% | 4.40%
Interest rate at the end of the period | 4.40% | 4.10%
United Dominion Reality L.P. [Member] | Fannie Mae [Member] |  |
Debt Instrument [Line Items] |  |
Borrowings outstanding | 507,976 | 667,507
Weighted average daily borrowings during the period ended | 580,527 | 721,054
Maximum daily borrowings during the period ended | $ 634,826 | $ 732,423
Weighted average interest rate during the period ended |  | 4.40%
Interest rate at the end of the period |  | 4.10%

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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