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Secured and Unsecured Debt (Details 2) (USD $)	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Debt Instrument [Line Items]
Secured Debt, Encumbers Real Estate Owned, Amount	$ 2,300,000,000
Secured Debt, Encumbers Real Estate Owned, Percent	28.40%
Debt Instrument Weighted Average Years to Maturity	4 years 2 months 26 days
Unamortized discount	15,600,000		16,900,000
Aggregate maturities of secured debt
2013	168,119,000
2014	357,946,000
2015	691,618,000
2016	570,933,000
2017	243,378,000
Thereafter	1,467,113,000
Total	1,425,663,000	1,430,135,000
Secured Debt, Unencumbered Real Estate Owned, Amount	5,900,000,000
Secured Debt, Unencumbered Real Estate Owned, Percent	71.60%
Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	4 years 7 months 19 days
Variable Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	6 years 1 month 14 days
2.68% Term Notes due December 2016 [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	2 years 9 months 29 days
Debt Instrument, Interest Rate, Stated Percentage	2.68%	2.68%
Four Point Six Three Percent Term Medium Notes Due January Two Thousand Twenty-Two [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	8 years 9 months 10 days
Debt Instrument, Interest Rate, Stated Percentage	4.63%	4.63%
Unamortized discount	$ 3,151,000	$ 3,241,000
Mortgages Notes Payable [Member] | Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	3 years 3 months 3 days
Mortgages Notes Payable [Member] | Variable Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	3 months
Tax Exempt Notes Payable [Member] | Variable Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	9 years 11 months 8 days
Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	5 years 6 months 29 days
Fannie Mae credit facilities [Member] | Variable Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	5 years 4 months 2 days
UDR Bank Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.00%
Debt Instrument Facility Fee, Basis Spread on Variable Rate	0.00%

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Interest rate stated in the contractual debt agreement.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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