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Joint Ventures (Details Textual) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  | 0 Months Ended |  |  |  |  |  |  |  |  |  | 3 Months Ended |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended |  | 3 Months Ended |  | 0 Months Ended
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Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011 | Dec. 31, 2007 Communities Apartment_Homes | Jun. 30, 2012 Unconsolidated Joint Venture One/UDR MetLife Partnership [Member] Communities Apartment_Homes Land_Parcels | Jun. 30, 2011 Unconsolidated Joint Venture One/UDR MetLife Partnership [Member] | Jun. 30, 2012 Unconsolidated Joint Venture One/UDR MetLife Partnership [Member] Communities Apartment_Homes Land_Parcels | Jun. 30, 2011 Unconsolidated Joint Venture One/UDR MetLife Partnership [Member] | Jan. 12, 2012 Unconsolidated Joint Venture One/UDR MetLife Partnership [Member] | Dec. 31, 2011 Unconsolidated Joint Venture One/UDR MetLife Partnership [Member] | Dec. 31, 2010 Unconsolidated Joint Venture One/UDR MetLife Partnership [Member] | Jan. 12, 2012 Columbus Square [Member] Apartment_Homes Communities | Jan. 12, 2012 Unconsolidated Joint Venture Seven UDR MetLife II Partnership [Member] Communities | Jun. 30, 2012 Unconsolidated Joint Venture Seven UDR MetLife II Partnership [Member] | Jun. 30, 2012 Unconsolidated Joint Venture Eight San Francisco California [Member] | Jan. 09, 2012 Unconsolidated Joint Venture Eight San Francisco California [Member] | Jun. 30, 2012 Unconsolidated Joint Venture Nine Boston Massachusetts [Member] | May 31, 2012 Unconsolidated Joint Venture Nine Boston Massachusetts [Member] | Jun. 30, 2012 Unconsolidated Joint Venture Two Stoughton Massachusetts [Member] | Dec. 31, 2011 Unconsolidated Joint Venture Two Stoughton Massachusetts [Member] | Oct. 31, 2010 Unconsolidated Joint Venture Two Stoughton Massachusetts [Member] | Jun. 30, 2012 Unconsolidated Joint Venture Three Washington DC [Member] | Dec. 31, 2011 Unconsolidated Joint Venture Three Washington DC [Member] | Jun. 30, 2012 Unconsolidated Joint Venture Four Texas [Member] | Dec. 31, 2011 Unconsolidated Joint Venture Four Texas [Member] | Jun. 30, 2012 Unconsolidated Joint Venture Five San Diego California [Member] | Dec. 31, 2011 Unconsolidated Joint Venture Five San Diego California [Member] | May 31, 2011 Unconsolidated Joint Venture Five San Diego California [Member] | Jun. 30, 2012 Unconsolidated Joint Venture Six College Park Maryland [Member] | Dec. 31, 2011 Unconsolidated Joint Venture Six College Park Maryland [Member] | Jun. 30, 2011 Unconsolidated Joint Venture Six College Park Maryland [Member] | Jun. 30, 2012 Consolidated Joint Venture One Orange County California [Member] | Dec. 31, 2011 Consolidated Joint Venture One Orange County California [Member] | Jun. 30, 2012 Land [Member] Unconsolidated Joint Venture One/UDR MetLife Partnership [Member] | Dec. 31, 2010 Land [Member] Unconsolidated Joint Venture One/UDR MetLife Partnership [Member] | Jun. 30, 2012 Buildings [Member] Unconsolidated Joint Venture One/UDR MetLife Partnership [Member] | Dec. 31, 2010 Buildings [Member] Unconsolidated Joint Venture One/UDR MetLife Partnership [Member] | Jun. 30, 2012 Intangible Assets [Member] Unconsolidated Joint Venture One/UDR MetLife Partnership [Member] | Dec. 31, 2010 Intangible Assets [Member] Unconsolidated Joint Venture One/UDR MetLife Partnership [Member] | Apr. 27, 2012 Corporate Joint Venture [Member] Unconsolidated Joint Venture Four Texas [Member] Communities Apartment_Homes
Joint Ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total ownership of our consolidated joint ventures | less than 100% |  | less than 100% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture, number of homes in communities |  |  |  |  |  |  | 3,930 |  | 3,930 |  |  |  |  | 2,528 |  |  |  |  |  |  |  |  | 240 | 660 |  |  |  |  |  | 263 |  |  | 256 |  | 173 |  |  |  |  |  |  | 633
Contribution made by company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,000,000 |  |  |  |  |  |  |
Controlling interest in consolidated joint venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00% |  |  |  |  |  |  |  |
Maximum number of days within which criteria is to met |  |  |  |  | 730 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional contribution made by company |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration accrued in business combination |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of underlying property |  |  |  |  | 9,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of underlying property upon completion of the entitlement process |  |  |  |  | 12,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial investment in equity method investment |  |  |  |  |  |  |  |  |  |  |  |  | 100,800,000 |  | 327,100,000 |  |  | 37,300,000 |  | 26,000,000 |  |  | 10,000,000 |  |  | 20,400,000 |  |  |  | 9,900,000 |  |  | 7,100,000 |  |  |  |  |  |  |  |  |
Number of operating communities in joint venture |  |  |  |  |  |  | 19 |  | 19 |  | 7 |  |  | 12 |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2
Number of land parcels owned |  |  |  |  |  |  | 10 |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Held in Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investments |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Venture Number of Operating Communities Transferred From Existing Ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional apartment homes |  |  |  |  |  |  | 2,000 |  | 2,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percent |  |  |  |  |  |  | 12.60% |  | 12.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  | 80.00%
Cash paid in partial consideration for acquisition of ownership interest in joint venture |  |  |  |  |  |  |  |  |  |  |  |  | 71,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payable incurred in partial consideration for acquisition of ownership interest in joint venture |  |  |  |  |  |  |  |  |  |  |  |  | 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount | 19,500,000 |  | 19,500,000 |  | 24,100,000 |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First installment of payable incurred in partial consideration for acquisition of ownership interest in joint venture |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Second installment of payable incurred in partial consideration for acquisition of ownership interest in joint venture |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net carrying amount of payable incurred in partial consideration for acquisition of ownership interest in joint venture |  |  |  |  |  |  | 9,900,000 |  | 9,900,000 |  |  | 9,800,000 | 29,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate of payable |  |  |  |  |  |  |  |  |  |  |  |  | 2.67% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense incurred during period |  |  |  |  |  |  | 66,000 | 196,000 | 132,000 | 391,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's equity investment in joint venture | 580,098,000 |  | 580,098,000 |  | 213,040,000 |  | 100,200,000 |  | 100,200,000 |  |  | 133,800,000 |  |  |  | 323,700,000 | 38,900,000 |  | 27,100,000 |  | 16,700,000 | 17,200,000 |  | 32,100,000 | 34,100,000 | 4,600,000 | 7,100,000 | 22,500,000 | 12,100,000 |  | 14,400,000 | 8,600,000 |  |  |  |  |  |  |  |  |  |
UDR's proportionate share in the underlying net assets of the joint venture |  |  |  |  |  |  |  |  |  |  |  |  | 111,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Difference between total cost of the Company's equity investment and proportionate share in the underlying assets of the joint venture |  |  |  |  |  |  |  |  |  |  |  |  | 10,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,900,000 |  | 8,400,000 |  | (1,600,000) |
Amortization/Accretion of the Company's carrying value of its equity method investment | 42,000 | 395,000 | 88,000 | 791,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization period attributable to adjustment to UDR's proportionate share in partnership's assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45 years |  | 11 months |  |
Joint Venture Number of Operating Communities, New Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investments, Joint Ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 637,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Equity Method Investments |  |  | 297,127,000 | 33,245,000 |  |  |  |  |  |  |  |  |  |  | 293,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity transferred value, equity method investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for (Proceeds from) Deposits on Real Estate Acquisitions |  |  | 0 | 44,176,000 |  |  |  |  |  |  |  |  |  |  | 80,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Anticipated Period to refinance loans by partnership |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest held in joint venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 92.50% |  | 98.00% |  | 95.00% | 95.00% |  | 30.00% | 30.00% |  |  | 95.00% | 95.00% |  | 95.00% | 95.00% |  |  |  |  |  |  |  |  |  |
Joint venture investment in multifamily properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 450,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Venture, Number of Apartment Homes in Operating Communities acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total equity contribution by partners when fully invested |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 180,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UDR's equity investment in joint venture when fully invested |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 54,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's contribution in cash equal to fair value of the properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contribution in cash and property equal to fair value of properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties initially contributed to joint venture |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of apartment homes initially contributed |  |  |  |  |  | 3,992 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties purchased from UDR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses and Interest in Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,700,000
Deferred profit from the sale of properties | 29,430,000 |  | 29,430,000 |  | 29,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management fees for our involvement in the joint ventures | $ 2,700,000 | $ 2,500,000 | $ 5,700,000 | $ 3,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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