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Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details) (Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 instruments
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Interest rate swaps [Member] |
Derivative [Line Items] |
Number instruments | 14
Notional | $ 419,787
Interest rate caps [Member] |
Derivative [Line Items] |
Number instruments | 6
Notional | 339,488
United Dominion Reality L.P. [Member] | Interest rate swaps [Member] |
Derivative [Line Items] |
Number instruments | 2
Notional | 96,974
United Dominion Reality L.P. [Member] | Interest rate caps [Member] |
Derivative [Line Items] |
Number instruments | 5
Notional | $ 255,561

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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Namespace Prefix: | invest_
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Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration

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- Definition Number of interest rate derivative instruments held by the entity at the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 + Details
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Namespace Prefix: | us-gaap_
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