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Debt (UNITED DOMINION REALTY, L.P.) (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011
Debt Instrument [Line Items] |  |
Principal outstanding | $ 1,442,361 | $ 1,891,553
Weighted Average Interest Rate | 4.35% |
Weighted Average Years to Maturity (in years) | 5.6 |
Number of Communities Encumbered (in communities) | 43 |
Fixed Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Principal outstanding | 1,098,837 | 1,334,717
Weighted Average Interest Rate | 5.20% |
Weighted Average Years to Maturity (in years) | 5.2 |
Number of Communities Encumbered (in communities) | 32 |
Fixed Rate Debt [Member] | Mortgage notes payable [Member] |  |
Debt Instrument [Line Items] |  |
Principal outstanding | 466,266 | 590,208
Weighted Average Interest Rate | 5.31% |
Weighted Average Years to Maturity (in years) | 3.8 |
Number of Communities Encumbered (in communities) | 9 |
Fixed Rate Debt [Member] | Fannie Mae credit facilities [Member] |  |
Debt Instrument [Line Items] |  |
Principal outstanding | 632,571 | 744,509
Weighted Average Interest Rate | 5.12% |
Weighted Average Years to Maturity (in years) | 6.3 |
Number of Communities Encumbered (in communities) | 23 |
Variable Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Principal outstanding | 343,524 | 556,836
Weighted Average Interest Rate | 1.63% |
Weighted Average Years to Maturity (in years) | 6.6 |
Number of Communities Encumbered (in communities) | 11 |
Variable Rate Debt [Member] | Mortgage notes payable [Member] |  |
Debt Instrument [Line Items] |  |
Principal outstanding | 37,415 | 151,685
Weighted Average Interest Rate | 1.06% |
Weighted Average Years to Maturity (in years) | 1.0 |
Number of Communities Encumbered (in communities) | 2 |
Variable Rate Debt [Member] | Fannie Mae credit facilities [Member] |  |
Debt Instrument [Line Items] |  |
Principal outstanding | 211,409 | 310,451
Weighted Average Interest Rate | 2.08% |
Weighted Average Years to Maturity (in years) | 6.1 |
Number of Communities Encumbered (in communities) | 7 |
Variable Rate Debt [Member] | Tax Exempt Notes Payable [Member] |  |
Debt Instrument [Line Items] |  |
Principal outstanding | 94,700 | 94,700
Weighted Average Interest Rate | 0.85% |
Weighted Average Years to Maturity (in years) | 10.1 |
Number of Communities Encumbered (in communities) | 2 |
United Dominion Reality L.P. [Member] |  |
Debt Instrument [Line Items] |  |
Principal outstanding | 970,255 | 1,189,645
Weighted Average Interest Rate | 4.47% |
Weighted Average Years to Maturity (in years) | 5.6 |
Number of Communities Encumbered (in communities) | 23,000 |
United Dominion Reality L.P. [Member] | Fannie Mae credit facilities [Member] |  |
Debt Instrument [Line Items] |  |
Principal outstanding | 508,000 |
United Dominion Reality L.P. [Member] | Fixed Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Principal outstanding | 768,653 | 902,622
Weighted Average Interest Rate | 5.11% |
Weighted Average Years to Maturity (in years) | 5.2 |
Number of Communities Encumbered (in communities) | 15,000 |
United Dominion Reality L.P. [Member] | Fixed Rate Debt [Member] | Mortgage notes payable [Member] |  |
Debt Instrument [Line Items] |  |
Principal outstanding | 397,864 | 457,723
Weighted Average Interest Rate | 5.31% |
Weighted Average Years to Maturity (in years) | 4.0 |
Number of Communities Encumbered (in communities) | 5,000 |
United Dominion Reality L.P. [Member] | Fixed Rate Debt [Member] | Fannie Mae credit facilities [Member] |  |
Debt Instrument [Line Items] |  |
Principal outstanding | 370,789 | 444,899
Weighted Average Interest Rate | 4.90% |
Weighted Average Years to Maturity (in years) | 6.7 |
Number of Communities Encumbered (in communities) | 10,000 |
United Dominion Reality L.P. [Member] | Variable Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Principal outstanding | 201,602 | 287,023
Weighted Average Interest Rate | 2.03% |
Weighted Average Years to Maturity (in years) | 7.3 |
Number of Communities Encumbered (in communities) | 8,000 |
United Dominion Reality L.P. [Member] | Variable Rate Debt [Member] | Mortgage notes payable [Member] |  |
Debt Instrument [Line Items] |  |
Principal outstanding | 37,415 | 37,415
Weighted Average Interest Rate | 1.06% |
Weighted Average Years to Maturity (in years) | 1.0 |
Number of Communities Encumbered (in communities) | 2,000 |
United Dominion Reality L.P. [Member] | Variable Rate Debt [Member] | Fannie Mae credit facilities [Member] |  |
Debt Instrument [Line Items] |  |
Principal outstanding | 137,187 | 222,608
Weighted Average Interest Rate | 2.55% |
Weighted Average Years to Maturity (in years) | 6.6 |
Number of Communities Encumbered (in communities) | 5,000 |
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
Weighted Average Interest Rate | 0.71% |
Weighted Average Years to Maturity (in years) | 17.7 |
Number of Communities Encumbered (in communities) | 1,000 |

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- Definition Number of Communities Encumbered. + References No definition available. + Details
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- Definition Secured debt including debt on real estate held for sale. + References No definition available. + Details
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- Definition The average effective interest rate during 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 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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