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Capital Structure (UNITED DOMINION REALTY, L.P.) (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Limited Partners' Capital Account [Line Items] |  |  |  |
Limited partnership units owned | 183,278,698 | 183,278,698 | 183,278,698 | 184,281,254
Redeemable non-controlling interests in the Operating Partnership and DownREIT Partnership | $ 946,436 | $ 282,480 | $ 217,597 |
United Dominion Reality L.P. |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
General Partners' Capital Account, Units Outstanding | 110,883 | 110,883 |  |
Limited partnership units owned | 183,167,815 | 183,167,815 |  |
Required period to be outstanding before unit is redeemable | 1 year |  |  |
Redeemable non-controlling interests in the Operating Partnership and DownREIT Partnership | $ 340,100 |  |  |
UDR, Inc. |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Limited partnership units owned | 174,114,516 | 174,002,342 |  |
Percentage of units | 95.10% | 95.00% |  |
Non-affiliated Partners |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Limited partnership units owned | 9,053,299 | 9,165,473 |  |
Percentage of units | 4.90% | 5.00% |  |
Class A Limited Partner |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Limited partnership units owned | 1,751,671 |  |  |
Cumulative, annual, non-compounded preferred return on Class A Partnership units | 8.00% |  |  |
Value of Class A Partnership units (in dollars per share) | $ 16.61 |  |  |
Class A Limited Partner | United Dominion Reality L.P. |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Limited partnership units owned | 1,873,332 | 1,751,671 |  |
Limited Partner [Member] |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Limited partnership units owned | 7,301,628 | 7,413,802 | 7,567,253 | 7,643,548
Limited Partner [Member] | UDR, Inc. |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Limited Partners' Capital Account, Units Redeemed |  | 1,002,556 |  |
Limited partnership units owned | 174,114,516 | 174,002,342 | 173,848,891 | 174,775,152
Limited Partner [Member] | Class A Limited Partner |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
Limited partnership units owned | 1,751,671 | 1,751,671 | 1,751,671 | 1,751,671
Partnership Capital [Member] | United Dominion Reality L.P. |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |
OP Units issued for real estate |  | $ 23,300 |  |

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