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Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details Textual) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2012 | Dec. 31, 2013
Entity Information [Line Items] |  |  |  |  |  |
Cash flow hedge ineffectiveness in earnings materiality | $3,000 | less than a $1,000 | 3000 | less than $1,000 |  |
Estimated additional accumulated other comprehensive Income/(Loss) transferred to interest expense | $ 4,400,000 |  | $ 4,400,000 |  |  |
Losses in the fair value of derivatives not designated in hedging relationships | 0 | (280,000) | 0 |  | (275,000) |
Fair value of derivatives in a net liability position | 2,400,000 |  | 2,400,000 |  |  |
Payment required to pay for contract termination | 2,400,000 |  | 2,400,000 |  |  |
Derivative, Collateral, Obligation to Return Cash | 0 |  | 0 |  |  | 0
United Dominion Reality L.P. [Member] |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Cash flow hedge ineffectiveness in earnings materiality | less than a $1,000 loss | less than a $1,000 loss | 0 | less than $1,000 | less than a $1,000 loss |
Estimated additional accumulated other comprehensive Income/(Loss) transferred to interest expense | 1,300,000 |  | 1,300,000 |  |  |
Losses in the fair value of derivatives not designated in hedging relationships | 0 | 0 | 0 | 5,000 | 5,000 |
Fair value of derivatives in a net liability position | 1,500,000 |  | 1,500,000 |  |  |
Payment required to pay for contract termination | 1,500,000 |  | 1,500,000 |  |  |
Derivative, Collateral, Obligation to Return Cash | $ 0 |  | $ 0 |  |  | $ 0

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- Definition The aggregate fair value of assets needed to immediately settle the derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624258-113959 + Details
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- Definition Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226016-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41678-113959 + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624258-113959 + Details
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- Definition Assertion that the amount of fair value hedge ineffectiveness is immaterial. + References No definition available. + Details
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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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