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Related Party Transactions (UNITED DOMINION REALTY, L.P.) (Details) (USD $) | 3 Months Ended | 6 Months Ended |  |  | 3 Months Ended | 6 Months Ended |  |  | 12 Months Ended |  | 3 Months Ended |
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Jun. 30, 2012 | Jun. 30, 2012 | Jun. 30, 2012 United Dominion Reality L.P. [Member] | Dec. 31, 2011 United Dominion Reality L.P. [Member] | Jun. 30, 2012 United Dominion Reality L.P. [Member] UDR, Inc. [Member] | Jun. 30, 2011 United Dominion Reality L.P. [Member] UDR, Inc. [Member] | Jun. 30, 2012 United Dominion Reality L.P. [Member] UDR, Inc. [Member] | Jun. 30, 2011 United Dominion Reality L.P. [Member] UDR, Inc. [Member] | Jun. 30, 2012 United Dominion Reality L.P. [Member] UDR, Inc. [Member] Bottom Dollar Guarantee [Member] | Dec. 31, 2011 United Dominion Reality L.P. [Member] UDR, Inc. [Member] Bottom Dollar Guarantee [Member] | Dec. 31, 2011 United Dominion Reality L.P. [Member] UDR, Inc. [Member] Guaranty Related To Community Acquisition [Member] | Jun. 30, 2012 United Dominion Reality L.P. [Member] UDR, Inc. [Member] Guaranty Related To Community Acquisition [Member] | Jun. 30, 2012 United Dominion Reality L.P. [Member] Taxable REIT Subsidiaries [Member] | Dec. 31, 2011 United Dominion Reality L.P. [Member] Taxable REIT Subsidiaries [Member]
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net receivable balances from General Partner |  |  | $ (56,069,000) | $ (193,584,000) |  |  |  |  |  |  |  |  | $ (56,069,000) | $ (193,584,000)
General and administrative expenses allocated to the Operating Partnership by UDR |  |  |  |  | 7,100,000 | 7,100,000 | 14,600,000 | 13,600,000 |  |  |  |  |  |
Related party management fee percentage |  |  |  |  |  |  |  |  |  |  |  |  | 2.75% |
Related party management fees | 2,800,000 | 5,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Related party guaranty note payable interest rate |  |  |  |  |  |  |  |  | 1.998% | 1.14% |  | 5.337% |  |
Notes payable due to General Partner |  |  | $ 88,771,000 | $ 88,771,000 |  |  |  |  | $ 83,300,000 |  | $ 5,500,000 | $ 5,500,000 |  |
Number of OP Units issued as consideration for acquisition guaranteed by related party note payable (in shares) |  |  |  |  |  |  |  |  |  |  | 1,802,239 |  |  |

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