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Related Party Transactions (UNITED DOMINION REALTY, L.P.) (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended |  | 9 Months Ended |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2014 United Dominion Reality L.P. [Member] | Sep. 30, 2013 United Dominion Reality L.P. [Member] | Sep. 30, 2014 United Dominion Reality L.P. [Member] | Sep. 30, 2013 United Dominion Reality L.P. [Member] | Dec. 31, 2013 United Dominion Reality L.P. [Member] | Sep. 30, 2014 United Dominion Reality L.P. [Member] Taxable REIT Subsidiaries [Member] | Dec. 31, 2013 United Dominion Reality L.P. [Member] Taxable REIT Subsidiaries [Member] | Sep. 30, 2014 United Dominion Reality L.P. [Member] UDR, Inc. [Member] | Sep. 30, 2013 United Dominion Reality L.P. [Member] UDR, Inc. [Member] | Sep. 30, 2014 United Dominion Reality L.P. [Member] UDR, Inc. [Member] | Dec. 31, 2012 United Dominion Reality L.P. [Member] UDR, Inc. [Member] | Sep. 30, 2014 United Dominion Reality L.P. [Member] UDR, Inc. [Member] Bottom Dollar Guaranty [Member] | Dec. 31, 2013 United Dominion Reality L.P. [Member] UDR, Inc. [Member] Bottom Dollar Guaranty [Member] | Sep. 30, 2014 United Dominion Reality L.P. [Member] UDR, Inc. [Member] Guaranty Related To Community Acquisition [Member] | Sep. 30, 2014 Fixed Rate Debt [Member] United Dominion Reality L.P. [Member] Guaranty Related To Community Acquisition [Member] | Sep. 30, 2014 Bottom Dollar Guaranty [Member] Fixed Rate Debt [Member] United Dominion Reality L.P. [Member]
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net receivable balances from General Partner |  |  |  |  |  | $ 795,000 |  | $ 795,000 |  | $ (9,916,000) | $ (795,000) | $ 9,916,000 |  |  |  |  |  |  |  |  |
General and administrative expenses allocated to the Operating Partnership by UDR |  |  |  |  |  |  |  |  |  |  |  |  | 6,600,000 | 6,500,000 | 20,500,000 | 17,400,000 |  |  |  |  |
Related Party Transaction, Management Fee Percentage |  |  |  |  |  |  |  | 2.75% |  |  | 2.75% |  |  |  |  |  |  |  |  |  |
Related party management fees | 3,200,000 | 3,100,000 | 9,400,000 |  | 9,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party guaranty note payable interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.18% |  | 5.337% |  |
Debt Instrument, Maturity Date Range, End |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Aug. 31, 2021 | Dec. 31, 2023
Interest Expense, Related Party | 1,200,000 | 3,500,000 | 300,000 | 800,000 |  | 1,151,000 | 267,000 | 3,453,000 | 801,000 |  |  |  |  |  |  |  |  |  |  |  |
Notes payable due to General Partner |  |  |  |  |  | $ 88,696,000 |  | $ 88,696,000 |  | $ 88,696,000 |  |  |  |  |  |  | $ 88,700,000 | $ 88,700,000 |  |  |

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