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Joint Ventures (Details Textual) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  | 9 Months Ended |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 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, 2013 | Dec. 31, 2012 | Jan. 31, 2014 | Sep. 30, 2014 Unconsolidated Joint Venture Two Stoughton Massachusetts [Member] | Dec. 31, 2013 Unconsolidated Joint Venture Two Stoughton Massachusetts [Member] | Sep. 30, 2014 Unconsolidated Joint Venture Five San Diego California [Member] | Dec. 31, 2013 Unconsolidated Joint Venture Five San Diego California [Member] | Jan. 31, 2014 13th & Market [Member] | Dec. 31, 2013 Unconsolidated Joint Venture 399 Fremont [Member] | Jul. 31, 2014 MetLife Swap [Member] | Sep. 30, 2014 MetLife Swap [Member] | Sep. 30, 2014 MetLife Swap [Member] | Dec. 31, 2013 MetLife Swap [Member] | Sep. 30, 2014 Land [Member] Unconsolidated Joint Venture Vitruvian Park [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] Noncontrolling Interest [Member] | Sep. 30, 2014 Land [Member] Unconsolidated Joint Venture Other MetLife [Member] Communities | Sep. 30, 2014 Operating Community [Member] | Sep. 30, 2014 Operating Community [Member] Unconsolidated Joint Venture Vitruvian Park [Member] | Dec. 31, 2013 Operating Community [Member] Unconsolidated Joint Venture Vitruvian Park [Member] | Sep. 30, 2014 Operating Community [Member] Unconsolidated Joint Venture UDR Met Life I Partnership [Member] 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 | Dec. 31, 2013 Operating Community [Member] Unconsolidated Joint Venture UDR MetLife II Partnership [Member] | Sep. 30, 2014 Operating Community [Member] Unconsolidated Joint Venture Three Washington DC [Member] Communities | Dec. 31, 2013 Operating Community [Member] Unconsolidated Joint Venture Three Washington DC [Member] | Sep. 30, 2014 Operating Community [Member] Unconsolidated Joint Venture Four Texas [Member] 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] Communities | Sep. 30, 2014 Development Community [Member] Unconsolidated Joint Venture Other MetLife [Member] Communities | Dec. 31, 2013 Development Community [Member] Unconsolidated Joint Venture Other MetLife [Member]
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of apartments of development community |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Communities Sold |  |  | 6 | 0 | 2 |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  | $ 237,700,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Venture and Partnership Number of Operating Communities Owned | 141 |  | 141 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 | 5 |  | 2 |  | 1,000 |  |  |  | 0 | 6 |  | 21 |  | 3 |  | 8 |  | 1 | 2,000 |
Number of extension options on loan |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extension period of option on loan |  |  |  |  |  |  |  | 3 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt | 1,399,372,000 |  | 1,399,372,000 |  | 1,442,077,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture |  |  |  |  |  |  |  |  |  | 0.00% | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage, equity method investment |  |  |  |  |  |  |  |  | 95.00% |  |  |  |  |  | 50.00% | 50.00% | 12.00% |  | 4.00% | 4.00% | 50.10% | 49.90% | 4.00% |  | 50.00% | 50.00% | 0.00% |  | 13.20% | 50.00% | 50.00% | 30.00% | 30.00% | 20.00% | 20.00% |  | 51.00% | 51.00%
Real Estate Owned Gross | 8,428,291,000 |  | 8,428,291,000 |  | 8,207,977,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount | 8,000,000 |  | 8,000,000 |  | 11,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First installment of payable incurred in partial consideration for acquisition of ownership interest in joint venture | 37,835,000 |  | 37,835,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Second installment of payable incurred in partial consideration for acquisition of ownership interest in joint venture | 521,233,000 |  | 521,233,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense | (33,087,000) | (30,939,000) | (97,662,000) | (92,723,000) |  | (92,723,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's equity investment in joint venture | 650,441,000 |  | 650,441,000 |  | 507,655,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,364,000 | 7,161,000 |  |  |  |  | 79,807,000 | 79,318,000 | 0 |  | 40,336,000 | 436,805,000 | 327,926,000 | 22,891,000 | 25,919,000 | (25,624,000) | (23,591,000) |  | 87,376,000 | 36,313,000
Non-controlling interest held in joint venture |  |  |  |  |  |  |  |  |  | 95.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred profit from the sale of properties | 27,132,000 |  | 27,132,000 |  | 25,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management fees for our involvement in the joint ventures | 2,700,000 | 2,800,000 | 8,300,000 | 8,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Paid in Equity Method Investment Exchange |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,500,000 | 82,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Additions |  |  | 129,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt associated with Real estate acquired | 63,600,000 |  | 63,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  |  |  |  |  | $ 4,000,000 |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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