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Joint Ventures (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 USD ($) Communities | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) Communities | Jun. 30, 2014 USD ($) | Jun. 30, 2013 USD ($) | Dec. 31, 2014 USD ($)
Financial information relating to unconsolidated joint ventures operations |  |  |  |  |  |
UDR income/(loss) from unconsolidated entities | $ (573,000) | $ (428,000) | $ 58,586,000 | $ (3,993,000) |  |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |  |  |
Investment in and advances to unconsolidated joint ventures, net | 914,815,000 |  | 914,815,000 |  |  | $ 718,226,000
Deferred gains on the sale of depreciable property | $ 6,800,000 |  | $ 6,800,000 |  |  | 28,500,000
Number of Real Estate Properties | Communities | 136 |  | 136 |  |  |
Unconsolidated Joint Ventures [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investment Summarized Financial Information Income/(loss) from discontinued operations | $ 0 | (4,705,000) | $ 182,488,000 | (31,688,000) |  |
Financial information relating to unconsolidated joint ventures operations |  |  |  |  |  |
Total revenues | 55,450,000 | 48,379,000 | 109,996,000 |  | $ 87,334,000 |
Equity Method Investment Summarized Financial Information Property Operating Expense | (21,557,000) | (18,001,000) | (41,724,000) | (32,360,000) |  |
Real estate depreciation and amortization | (19,402,000) | (16,808,000) | (38,754,000) |  | (31,496,000) |
Net income /(loss) | (1,685,000) | (6,063,000) | 179,769,000 |  | $ (35,289,000) |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |  |  |
Total real estate, net | 3,004,723,000 |  | 3,004,723,000 |  |  | 2,941,803,000
Equity Method of Investment Summarized Financial Information, Assets Sold or Held For Sale | 0 |  | 0 |  |  | 216,196,000
Equity Method Investment Summarized Financial Information Cash and cash equivalents | 36,820,000 |  | 36,820,000 |  |  | 32,544,000
Equity Method Investment Summarized Financial Information Other assets | 32,869,000 |  | 32,869,000 |  |  | 28,707,000
Total assets | 3,074,412,000 |  | 3,074,412,000 |  |  | 3,219,250,000
Amount due to UDR | 6,434,000 |  | 6,434,000 |  |  | 2,997,000
Third party debt | 1,529,724,000 |  | 1,529,724,000 |  |  | 1,504,477,000
Equity Method of Investment Summarized Financial Information, Liabilities Sold or Held For Sale | 0 |  | 0 |  |  | 229,706,000
Equity Method Investment Summarized Financial Information Accounts payable and accrued liabilities | 63,521,000 |  | 63,521,000 |  |  | 44,335,000
Total liabilities | 1,599,679,000 |  | 1,599,679,000 |  |  | 1,781,515,000
Total equity | 1,474,733,000 |  | 1,474,733,000 |  |  | 1,437,735,000
Equity Method Investment, Summarized Financial Information, Liabilities and Equity | 3,074,412,000 |  | 3,074,412,000 |  |  | 3,219,250,000
Investment in and advances to unconsolidated joint ventures, net | 695,980,000 |  | 695,980,000 |  |  | 655,519,000
Equity Method of Investment Summarized Financial Information Operating income/(loss) | 14,491,000 | 13,570,000 | 29,518,000 | 23,478,000 |  |
Equity Method Investment Summarized Financial Information Interest expense | (16,169,000) | (14,928,000) | (32,230,000) | (27,079,000) |  |
Equity Method Investment Summarized Financial Information Other income/(expense) | (7,000) | 0 | (7,000) | 0 |  |
Unconsolidated Joint Venture Four Texas [Member] |  |  |  |  |  |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |  |  |
Deferred gains on the sale of depreciable property | 24,200,000 |  | 24,200,000 |  |  |
Operating Community [Member] | Unconsolidated Joint Venture UDR Met Life I Partnership [Member] |  |  |  |  |  |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |  |  |
Investment in and advances to unconsolidated joint ventures, net | $ 14,181,000 |  | $ 14,181,000 |  |  | $ 13,306,000
Equity Method Investment, Ownership Percentage | 16.10% |  | 16.10% |  |  | 15.70%
Number of apartment homes | 0 |  | 0 |  |  |
Number of Real Estate Properties | 4 |  | 4 |  |  |
Operating Community [Member] | Unconsolidated Joint Venture UDR MetLife II Partnership [Member] |  |  |  |  |  |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |  |  |
Investment in and advances to unconsolidated joint ventures, net | $ 428,321,000 |  | $ 428,321,000 |  |  | $ 431,277,000
Equity Method Investment, Ownership Percentage | 50.00% |  | 50.00% |  |  | 50.00%
Number of apartment homes | 4,642 |  | 4,642 |  |  |
Number of Real Estate Properties | 21 |  | 21 |  |  |
Operating Community [Member] | Unconsolidated Joint Venture Vitruvian Park [Member] |  |  |  |  |  |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |  |  |
Investment in and advances to unconsolidated joint ventures, net | $ 75,531,000 |  | $ 75,531,000 |  |  | $ 80,302,000
Equity Method Investment, Ownership Percentage | 50.00% |  | 50.00% |  |  | 50.00%
Number of apartment homes | 1,130 |  | 1,130 |  |  |
Number of Real Estate Properties | 3 |  | 3 |  |  |
Operating Community [Member] | Unconsolidated Joint Venture Three [Member] |  |  |  |  |  |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |  |  |
Investment in and advances to unconsolidated joint ventures, net | $ 19,775,000 |  | $ 19,775,000 |  |  | $ 21,596,000
Equity Method Investment, Ownership Percentage | 30.00% |  | 30.00% |  |  | 30.00%
Number of apartment homes | 660 |  | 660 |  |  |
Number of Real Estate Properties | 3 |  | 3 |  |  |
Operating Community [Member] | Unconsolidated Joint Venture Four Texas [Member] |  |  |  |  |  |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 0.00% |  | 0.00% |  |  | 20.00%
Number of Real Estate Properties | Communities | 8 |  | 8 |  |  |
Operating Community [Member] | Unconsolidated Joint Venture Other MetLife [Member] |  |  |  |  |  |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |  |  |
Investment in and advances to unconsolidated joint ventures, net | $ 158,172,000 |  | $ 158,172,000 |  |  | $ 134,939,000
Equity Method Investment, Ownership Percentage | 50.60% |  | 50.60% |  |  | 50.60%
Number of apartment homes | 1,437 |  | 1,437 |  |  |
Number of Real Estate Properties | 1 |  | 1 |  |  |
Land Parcel [Member] | Unconsolidated Joint Venture Vitruvian Park [Member] |  |  |  |  |  |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |  |  |
Number of Real Estate Properties | 6 |  | 6 |  |  |
Development Community [Member] | Unconsolidated Joint Venture Four Texas [Member] |  |  |  |  |  |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |  |  |
Investment in and advances to unconsolidated joint ventures, net | $ 0 |  | $ 0 |  |  | $ (25,901,000)
Number of apartment homes | 0 |  | 0 |  |  |
Number of Real Estate Properties | 0 |  | 0 |  |  |
Development Community [Member] | Unconsolidated Joint Venture Other MetLife [Member] |  |  |  |  |  |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |  |  |
Number of Real Estate Properties | 4 |  | 4 |  |  |
Development Community [Member] | Participating Loan Investment Steele Creek Denver Colorado [Member] |  |  |  |  |  |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |  |  |
Investment in and advances to unconsolidated joint ventures, net | $ 85,208,000 |  | $ 85,208,000 |  |  | 62,707,000
Income from Participating Loan | $ 1,352,000 | 456,000 | $ 2,506,000 | 777,000 |  |
Participating Loan, Interest Rate, Stated Percentage | 6.50% |  | 6.50% |  |  |
Participating Loan Years to Maturity |  |  | 2 years 1 month 6 days |  |  |
Development Community [Member] | Preferred Equity Investment West Coast Development JV [Member] |  |  |  |  |  |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |  |  |
Investment in and advances to unconsolidated joint ventures, net | $ 133,627,000 |  | $ 133,627,000 |  |  | $ 0
Income from Participating Loan | $ (548) | $ 0 | $ (548) | $ 0 |  |
Participating Loan, Interest Rate, Stated Percentage | 6.50% |  | 6.50% |  |  |
Land [Member] | Unconsolidated Joint Venture Other MetLife [Member] |  |  |  |  |  |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |  |  |
Number of Real Estate Properties | 1 |  | 1 |  |  |

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