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Debt (UNITED DOMINION REALTY, L.P.) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 Communities	Dec. 31, 2012
Debt Instrument [Line Items]
Weighted Average Interest Rate	4.34%
Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 1,082,139	$ 1,086,611
Weighted Average Interest Rate	5.24%
Number of Communities Encumbered (in communities)	31
Fixed Rate Debt [Member] | Mortgages Notes Payable [Member]
Debt Instrument [Line Items]
Principal outstanding	453,076	455,533
Weighted Average Interest Rate	5.41%
Number of Communities Encumbered (in communities)	8
Fixed Rate Debt [Member] | Fannie Mae credit facilities [Member]
Debt Instrument [Line Items]
Principal outstanding		631,078
Number of Communities Encumbered (in communities)	23
Debt, Weighted Average Interest Rate	5.11%
Variable Rate Debt [Member]
Debt Instrument [Line Items]
Principal outstanding	343,524	343,524
Weighted Average Interest Rate	1.63%
Number of Communities Encumbered (in communities)	11
Variable Rate Debt [Member] | Mortgages Notes Payable [Member]
Debt Instrument [Line Items]
Principal outstanding	37,415	37,415
Weighted Average Interest Rate	1.09%
Number of Communities Encumbered (in communities)	2
Variable Rate Debt [Member] | Fannie Mae credit facilities [Member]
Debt Instrument [Line Items]
Principal outstanding	211,409	211,409
Number of Communities Encumbered (in communities)	7
Debt Instrument, Interest Rate at Period End	2.06%
Variable Rate Debt [Member] | Tax Exempt Notes Payable [Member]
Debt Instrument [Line Items]
Principal outstanding	94,700	94,700
Weighted Average Interest Rate	0.87%
Number of Communities Encumbered (in communities)	2
United Dominion Reality L.P. [Member]
Debt Instrument [Line Items]
Principal outstanding	964,989	967,239
Weighted Average Interest Rate	4.51%
Number of Communities Encumbered (in communities)	23
United Dominion Reality L.P. [Member] | Fannie Mae credit facilities [Member]
Debt Instrument [Line Items]
Principal outstanding	507,600
United Dominion Reality L.P. [Member] | Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Principal outstanding	763,387	765,637
Weighted Average Interest Rate	5.16%
Number of Communities Encumbered (in communities)	15
United Dominion Reality L.P. [Member] | Fixed Rate Debt [Member] | Mortgages Notes Payable [Member]
Debt Instrument [Line Items]
Principal outstanding	392,953	394,999
Weighted Average Interest Rate	5.41%
Number of Communities Encumbered (in communities)	5
United Dominion Reality L.P. [Member] | Fixed Rate Debt [Member] | Fannie Mae credit facilities [Member]
Debt Instrument [Line Items]
Number of Communities Encumbered (in communities)	10
Debt, Weighted Average Interest Rate	4.90%
United Dominion Reality L.P. [Member] | Variable Rate Debt [Member]
Debt Instrument [Line Items]
Principal outstanding	201,602	201,602
Weighted Average Interest Rate	2.04%
Number of Communities Encumbered (in communities)	8
United Dominion Reality L.P. [Member] | Variable Rate Debt [Member] | Mortgages Notes Payable [Member]
Debt Instrument [Line Items]
Principal outstanding	37,415	37,415
Number of Communities Encumbered (in communities)	2
Debt Instrument, Interest Rate at Period End	1.09%
United Dominion Reality L.P. [Member] | Variable Rate Debt [Member] | Fannie Mae credit facilities [Member]
Debt Instrument [Line Items]
Number of Communities Encumbered (in communities)	5
Debt, Weighted Average Interest Rate	2.52%
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
Number of Communities Encumbered (in communities)	1
Debt Instrument, Interest Rate at Period End	0.90%
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]
Debt Instrument [Line Items]
Principal outstanding	211,409
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]
Debt Instrument [Line Items]
Principal outstanding	370,434	370,638
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	$ 137,187	$ 137,187

X

- Definition

Number of Communities Encumbered.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Secured debt including debt on real estate held for sale.

+ References

No definition available.

+ Details

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Namespace Prefix:	udr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The effective interest rate at the end of the reporting period.

+ References

Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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

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X

- Definition

The average effective interest rate during the reporting period.

+ References

Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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

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- Definition

Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time.

+ References

No definition available.

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