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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

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- Definition

Average amount borrowed under the credit facility during the period.

+ References

No definition available.

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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

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- Definition

The 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 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

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Maximum amount borrowed under the credit facility at any time during the period.

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