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Secured and Unsecured Debt (Details 2) (USD $) | 9 Months Ended |  | 9 Months Ended |  |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended | 3 Months Ended
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Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 Fixed Rate Debt [Member] | Sep. 30, 2014 Variable Rate Debt [Member] | Sep. 30, 2014 ThreePointSevenTermNotesDueOctober2020 [Member] | Dec. 31, 2013 ThreePointSevenTermNotesDueOctober2020 [Member] | Sep. 30, 2013 ThreePointSevenTermNotesDueOctober2020 [Member] | Sep. 30, 2014 2.68% Term Notes due December 2016 [Member] | Dec. 31, 2013 2.68% Term Notes due December 2016 [Member] | Sep. 30, 2014 Four Point Six Three Percent Term Medium Notes Due January Two Thousand Twenty-Two [Member] | Dec. 31, 2013 Four Point Six Three Percent Term Medium Notes Due January Two Thousand Twenty-Two [Member] | Sep. 30, 2014 Mortgages Notes Payable [Member] Fixed Rate Debt [Member] | Sep. 30, 2014 Mortgages Notes Payable [Member] Variable Rate Debt [Member] | Sep. 30, 2014 Tax Exempt Notes Payable [Member] Variable Rate Debt [Member] | Sep. 30, 2014 Fannie Mae credit facilities [Member] Fixed Rate Debt [Member] | Sep. 30, 2014 Fannie Mae credit facilities [Member] Variable Rate Debt [Member] | Sep. 30, 2014 3.75 MTN Due July 2024 [Member] | Sep. 30, 2014 UDR Bank Credit Facility [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.10%
Debt Instrument Facility Fee, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.20%
Secured Debt, Encumbers Real Estate Owned, Amount | $ 2,300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt, Encumbers Real Estate Owned, Percent | 26.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Weighted Average Years to Maturity | 4 years 6 months |  | 3 years 2 months 29 days | 6 years 2 months 17 days | 6 years |  |  | 3 years 8 months 4 days |  | 7 years 3 months 10 days |  | 1 year 9 months 3 days | 2 years 3 months 25 days | 8 years 5 months 8 days | 4 years 3 months 7 days | 5 years 9 months 7 days | 9 years 9 months |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 0.00% | 3.70% | 2.50% | 2.68% | 4.63% | 4.63% |  |  |  |  |  | 3.75% |
Unamortized discount | 8,000,000 | 11,800,000 |  |  |  |  |  |  |  | 2,792,000 | 2,882,000 |  |  |  |  |  | 1,000,000 |
Aggregate maturities of secured debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 | 37,835,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 | 521,233,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 | 250,188,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 | 402,955,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | 874,982,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thereafter | 1,540,999,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total | 1,399,372,000 | 1,442,077,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt, Unencumbered Real Estate Owned, Amount | $ 6,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt, Unencumbered Real Estate Owned, Percent | 73.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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