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Related Party Transactions (UNITED DOMINION REALTY, L.P.) (Details) - Long-term Debt, Type [Domain] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Related Party Transaction [Line Items] |  |  |  |  |
Related party management fees | $ 4,300 | $ 3,100 | $ 8,600 | $ 6,200 |
United Dominion Reality L.P. [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Limited partnership units owned | 183,167,815 |  | 183,167,815 |  | 183,167,815
Net receivable balances from General Partner | $ 2,956 |  | $ 2,956 |  | $ 13,624
Related Party Transaction, Management Fee Percentage |  |  | 2.75% |  |
Interest Expense, Related Party | 1,151 | 1,151 | $ 2,302 | 2,302 |
Notes payable due to General Partner | 88,696 |  | 88,696 |  | 88,696
United Dominion Reality L.P. [Member] | Taxable REIT Subsidiaries [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Net receivable balances from General Partner | (2,956) |  | $ (2,956) |  | (13,624)
Related Party Transaction, Management Fee Percentage |  |  | 2.75% |  |
United Dominion Reality L.P. [Member] | UDR, Inc. [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
General and administrative expenses allocated to the Operating Partnership by UDR | $ 5,700 | $ 7,200 | $ 9,900 | $ 13,900 |
United Dominion Reality L.P. [Member] | UDR, Inc. [Member] | Bottom Dollar Guaranty [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Notes payable due to General Partner |  |  |  |  | $ 88,700
Note for 83.2 million [Member] | United Dominion Reality L.P. [Member] | UDR, Inc. [Member] | Guaranty Related To Community Acquisition [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party guaranty note payable interest rate | 5.18% |  | 5.18% |  |
Debt Instrument, Maturity Date Range, End |  |  | Aug. 31, 2021 |  |
Note for 5 million [Member] | United Dominion Reality L.P. [Member] | UDR, Inc. [Member] | Guaranty Related To Community Acquisition [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party guaranty note payable interest rate | 5.34% |  | 5.34% |  |
Debt Instrument, Maturity Date Range, End |  |  | Dec. 31, 2023 |  |

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