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Consolidation and Basis of Presentation (UNITED DOMINION REALTY, L.P.) (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 Communities | Dec. 31, 2014 shares | Dec. 31, 2013 shares | Dec. 31, 2015 | Dec. 31, 2015 USD ($) | Dec. 31, 2015 Apartment_Homes | Dec. 31, 2015 shares | Dec. 31, 2015 Markets | Dec. 31, 2012 shares
Consolidation and Basis of Presentation [Line Items] |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | 133 |  |  | 2 |  |  |  |  |
Number of markets operating within | $ |  |  |  |  | 18 |  |  |  |
Number of apartments owned | Apartment_Homes |  |  |  |  |  | 40,728 |  |  |
Operating Partnership outstanding units |  | 183,278,698 |  |  |  |  | 183,278,698 |  |
OP units outstanding related to limited partner |  | 183,278,698 | 183,278,698 |  |  |  | 183,278,698 |  | 184,281,254
Limited Partner [Member] |  |  |  |  |  |  |  |  |
Consolidation and Basis of Presentation [Line Items] |  |  |  |  |  |  |  |  |
Percentage of units outstanding owned by limited partners |  |  |  | 95.10% |  |  |  |  |
United Dominion Reality L.P. |  |  |  |  |  |  |  |  |
Consolidation and Basis of Presentation [Line Items] |  |  |  |  |  |  |  |  |
Rental revenues percent of General Partner's consolidated rental revenues | 51.00% | 52.00% | 54.00% |  |  |  |  |  |
Number of Real Estate Properties | Communities | 57 |  |  |  |  |  |  |  |
Number of markets operating within | Markets |  |  |  |  |  |  |  | 14 |
Number of apartments owned | Apartment_Homes |  |  |  |  |  | 16,974 |  |  |
OP units outstanding related to general partner |  | 110,883 |  |  |  |  | 110,883 |  |
Percentage of total outstanding Operating Partnership units represented by General Partnership units outstanding |  |  |  | 0.10% |  |  |  |  |
OP units outstanding related to limited partner |  | 183,167,815 |  |  |  |  | 183,167,815 |  |
UDR, Inc. |  |  |  |  |  |  |  |  |
Consolidation and Basis of Presentation [Line Items] |  |  |  |  |  |  |  |  |
OP units outstanding related to limited partner |  | 174,002,342 |  |  |  |  | 174,114,516 |  |
Percentage of units outstanding owned by limited partners |  | 95.00% |  | 95.10% |  |  |  |  |
Non-affiliated Partners |  |  |  |  |  |  |  |  |
Consolidation and Basis of Presentation [Line Items] |  |  |  |  |  |  |  |  |
OP units outstanding related to limited partner |  | 9,165,473 |  |  |  |  | 9,053,299 |  |
Percentage of units outstanding owned by limited partners |  | 5.00% |  | 4.90% |  |  |  |  |
General Partner [Member] |  |  |  |  |  |  |  |  |
Consolidation and Basis of Presentation [Line Items] |  |  |  |  |  |  |  |  |
OP units outstanding related to limited partner |  | 174,113,225 |  |  |  |  | 174,225,399 |  |
Percentage of units outstanding owned by limited partners |  | 95.00% |  |  |  |  |  |  |
Class A Limited Partner |  |  |  |  |  |  |  |  |
Consolidation and Basis of Presentation [Line Items] |  |  |  |  |  |  |  |  |
OP units outstanding related to limited partner |  |  |  |  |  |  | 1,751,671 |  |
Class A Limited Partner | United Dominion Reality L.P. |  |  |  |  |  |  |  |  |
Consolidation and Basis of Presentation [Line Items] |  |  |  |  |  |  |  |  |
OP units outstanding related to limited partner |  | 1,751,671 |  |  |  |  | 1,873,332 |  |

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