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Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details) $ in Thousands	Dec. 31, 2015 USD ($) instruments
Designated as Hedging Instrument | Interest rate swaps
Derivative [Line Items]
Number of Instruments	5
Derivative, Notional Amount	$ 315,000
Designated as Hedging Instrument | Interest rate caps
Derivative [Line Items]
Number of Instruments	2
Derivative, Notional Amount	$ 203,166
Not Designated as Hedging Instrument | Interest rate caps
Derivative [Line Items]
Number of Instruments | instruments	3
Derivative, Notional Amount	$ 133,107
United Dominion Reality L.P. | Designated as Hedging Instrument | Interest rate caps
Derivative [Line Items]
Number of Instruments	1
Derivative, Notional Amount	$ 96,327
United Dominion Reality L.P. | Not Designated as Hedging Instrument | Interest rate caps
Derivative [Line Items]
Number of Instruments | instruments	3
Derivative, Notional Amount	$ 98,932

X

- 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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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- 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

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- Details

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- Details

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- Details

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- Details

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- Details

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