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Joint Ventures (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  |
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Sep. 30, 2014 Communities | Sep. 30, 2013 | Sep. 30, 2014 Communities | Sep. 30, 2013 | Dec. 31, 2012 | Dec. 31, 2013 | Sep. 30, 2014 Unconsolidated Joint Ventures [Member] | Sep. 30, 2013 Unconsolidated Joint Ventures [Member] | Sep. 30, 2014 Unconsolidated Joint Ventures [Member] | Dec. 31, 2013 Unconsolidated Joint Ventures [Member] | Dec. 31, 2012 Unconsolidated Joint Ventures [Member] | Dec. 31, 2013 Unconsolidated Joint Venture Two Stoughton Massachusetts [Member] | Sep. 30, 2014 Operating Community [Member] Unconsolidated Joint Venture UDR Met Life I Partnership [Member] Apartment_Homes Communities | Mar. 31, 2014 Operating Community [Member] Unconsolidated Joint Venture UDR Met Life I Partnership [Member] Communities | Dec. 31, 2013 Operating Community [Member] Unconsolidated Joint Venture UDR Met Life I Partnership [Member] | Sep. 30, 2014 Operating Community [Member] Unconsolidated Joint Venture UDR MetLife II Partnership [Member] Communities Apartment_Homes | Dec. 31, 2013 Operating Community [Member] Unconsolidated Joint Venture UDR MetLife II Partnership [Member] | Sep. 30, 2014 Operating Community [Member] Unconsolidated Joint Venture Vitruvian Park [Member] Apartment_Homes | Dec. 31, 2013 Operating Community [Member] Unconsolidated Joint Venture Vitruvian Park [Member] | Sep. 30, 2014 Operating Community [Member] Unconsolidated Joint Venture Three [Member] Apartment_Homes Communities | Dec. 31, 2013 Operating Community [Member] Unconsolidated Joint Venture Three [Member] | Sep. 30, 2014 Operating Community [Member] Unconsolidated Joint Venture Four Texas [Member] Apartment_Homes Communities | Dec. 31, 2013 Operating Community [Member] Unconsolidated Joint Venture Four Texas [Member] | Sep. 30, 2014 Development Community [Member] Unconsolidated Joint Venture Vitruvian Park [Member] Apartment_Homes Communities | Sep. 30, 2014 Development Community [Member] Unconsolidated Joint Venture Other MetLife [Member] Apartment_Homes Communities | Dec. 31, 2013 Development Community [Member] Unconsolidated Joint Venture Other MetLife [Member] | Sep. 30, 2014 Development Community [Member] Participating Loan Investment Steele Creek Denver Colorado [Member] | Sep. 30, 2014 Development Community [Member] Participating Loan Investment Steele Creek Denver Colorado [Member] | Sep. 30, 2013 Development Community [Member] Participating Loan Investment Steele Creek Denver Colorado [Member] | Dec. 31, 2013 Development Community [Member] Participating Loan Investment Steele Creek Denver Colorado [Member] | Sep. 30, 2014 Land [Member] Unconsolidated Joint Venture UDR Met Life I Partnership [Member] Land_Parcels | Dec. 31, 2013 Land [Member] Unconsolidated Joint Venture UDR Met Life I Partnership [Member] | Sep. 30, 2014 Land [Member] Unconsolidated Joint Venture UDR MetLife II Partnership [Member] Land_Parcels | Sep. 30, 2014 Land [Member] Unconsolidated Joint Venture Vitruvian Park [Member] | Sep. 30, 2014 Land [Member] Unconsolidated Joint Venture Other MetLife [Member] Communities
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Summarized Financial Information, Gain (Loss) on Sale of Real Estate |  |  |  |  |  |  | $ (113) | $ 0 | $ (25,492) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment Summarized Financial Information Income/(loss) from discontinued operations |  |  |  |  |  |  | 0 | (806) | 14 | (22,592) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial information relating to unconsolidated joint ventures operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  | 63,449 | 61,198 | 187,340 |  | 166,796 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment Summarized Financial Information Property Operating Expense |  |  |  |  |  |  | (24,769) | (24,509) | (74,324) | (64,532) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate depreciation and amortization |  |  |  |  |  |  | (24,525) | (21,285) | (73,727) |  | (58,699) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income /(loss) |  |  |  |  |  |  | (4,837) | (4,772) | (43,124) |  | (32,305) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UDR income/(loss) from unconsolidated entities | (939) | (3,794) | (4,932) | (6,081) | (6,081) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total real estate, net |  |  |  |  |  |  | 3,012,380 |  | 3,012,380 | 3,124,178 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment Summarized Financial Information Cash and cash equivalents |  |  |  |  |  |  | 40,656 |  | 40,656 | 41,792 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment Summarized Financial Information Other assets |  |  |  |  |  |  | 37,903 |  | 37,903 | 32,234 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets |  |  |  |  |  |  | 3,090,939 |  | 3,090,939 | 3,198,204 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount due to UDR |  |  |  |  |  |  | 10,856 |  | 10,856 | 12,187 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third party debt |  |  |  |  |  |  | 1,659,316 |  | 1,659,316 | 1,722,960 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment Summarized Financial Information Accounts payable and accrued liabilities |  |  |  |  |  |  | 49,388 |  | 49,388 | 41,562 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities |  |  |  |  |  |  | 1,719,560 |  | 1,719,560 | 1,776,709 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total equity |  |  |  |  |  |  | 1,371,379 |  | 1,371,379 | 1,421,495 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Summarized Financial Information, Liabilities and Equity |  |  |  |  |  |  | 3,090,939 |  | 3,090,939 | 3,198,204 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in and advances to unconsolidated joint ventures, net | 650,441 |  | 650,441 |  |  | 507,655 | 606,619 |  | 606,619 | 493,382 |  |  | 0 |  | 40,336 | 436,805 | 327,926 | 79,807 | 79,318 | 22,891 | 25,919 | (25,624) | (23,591) |  | 87,376 | 36,313 | 43,822 | 43,822 |  | 14,273 | 5,364 | 7,161 |  |  |
Income from Participating Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 1,419 | 0 |  |  |  |  |  |
Deferred gains on the sale of depreciable property | 27,132 |  | 27,132 |  |  | 25,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage, equity method investment |  |  |  |  |  |  |  |  |  |  |  | 95.00% | 0.00% |  | 13.20% | 50.00% | 50.00% | 50.00% | 50.00% | 30.00% | 30.00% | 20.00% | 20.00% |  | 51.00% | 51.00% |  |  |  |  | 4.00% | 4.00% | 50.10% |  | 4.00%
Number of apartment homes |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 4,642 |  | 739 |  | 660 |  | 3,359 |  | 391 | 828 |  |  |  |  |  |  |  |  |  |
Joint Venture and Partnership Number of Operating Communities Owned | 141 |  | 141 |  |  |  |  |  |  |  |  |  | 0 | 6 |  | 21 |  |  |  | 3 |  | 8 |  | 1 | 2,000 |  |  |  |  |  | 5 |  | 2 | 6 | 1,000
Participating Loan, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.50% | 6.50% |  |  |  |  |  |  |
Participating Loan Years to Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years 1 month 2 days |  |  |  |  |  |  |
Equity Method of Investment Summarized Financial Information Operating income/(loss) |  |  |  |  |  |  | 14,155 | 15,404 | 39,289 | 43,565 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment Summarized Financial Information Interest expense |  |  |  |  |  |  | (18,879) | (19,370) | (56,745) | (53,282) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment Summarized Financial Information Other income/(expense) |  |  |  |  |  |  | $ 0 | $ 0 | $ (190) | $ 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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