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Capital Structure (UNITED DOMINION REALTY, L.P.) (Details) - shares | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Limited Partners' Capital Account [Line Items] |  |  |
Balance | 183,278,698 | 183,278,698 | 184,281,254
Partners' Capital Account, Units, Redeemed | 0 | 0 | 0
OP Units issued for acquisitions of real estate |  |  | (1,002,556)
Balance | 183,278,698 | 183,278,698 | 183,278,698
UDR, Inc. |  |  |
Limited Partners' Capital Account [Line Items] |  |  |
Balance | 174,002,342 |  |
Balance | 174,114,516 | 174,002,342 |
Class A Limited Partner |  |  |
Limited Partners' Capital Account [Line Items] |  |  |
Balance | 1,751,671 |  |
Limited Partner |  |  |
Limited Partners' Capital Account [Line Items] |  |  |
Balance | 7,413,802 | 7,567,253 | 7,643,548
Partners' Capital Account, Units, Redeemed | (112,174) | (153,451) | (76,295)
OP Units issued for acquisitions of real estate |  |  | 0
Balance | 7,301,628 | 7,413,802 | 7,567,253
Limited Partner | UDR, Inc. |  |  |
Limited Partners' Capital Account [Line Items] |  |  |
Limited Partners' Capital Account, Units Redeemed |  | 1,002,556 |
Balance | 174,002,342 | 173,848,891 | 174,775,152
Partners' Capital Account, Units, Redeemed | (112,174) | (153,451) | (76,295)
OP Units issued for acquisitions of real estate |  |  | (1,002,556)
Balance | 174,114,516 | 174,002,342 | 173,848,891
Limited Partner | Class A Limited Partner |  |  |
Limited Partners' Capital Account [Line Items] |  |  |
Balance | 1,751,671 | 1,751,671 | 1,751,671
Partners' Capital Account, Units, Redeemed | 0 | 0 | 0
OP Units issued for acquisitions of real estate |  |  | 0
Balance | 1,751,671 | 1,751,671 | 1,751,671
General Partner | UDR, Inc. |  |  |
Limited Partners' Capital Account [Line Items] |  |  |
Balance | 110,883 | 110,883 | 110,883
Partners' Capital Account, Units, Redeemed | 0 | 0 | 0
OP Units issued for acquisitions of real estate |  |  | 0
Balance | 110,883 | 110,883 | 110,883

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- Definition Limited Partners' Capital Account, Units Redeemed for Cash + References No definition available. + Details
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- 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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- Definition The number of limited partner units outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section F + Details
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