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Debt (UNITED DOMINION REALTY, L.P.) (Details Textual) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2012 | Dec. 31, 2011
Debt Instrument [Line Items] |  |  |  |  |  |
Total revolving credit facility | $ 932,800,000 |  | $ 932,800,000 |  |  |
Borrowings outstanding | 800,000,000 |  | 800,000,000 |  |  |
Initial term of credit facilities (in years) | 10 years |  |  |  |  |
Secured debt including debt on real estate held for sale | 1,442,361,000 |  | 1,442,361,000 |  | 1,891,553,000 |
Weighted average interest rate |  |  | 4.35% |  |  |
Unamortized fair market adjustment | 19,500,000 |  | 19,500,000 |  | 24,100,000 |
UDR Bank Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total revolving credit facility | 900,000,000 |  | 900,000,000 |  | 900,000,000 |
Borrowings outstanding | 0 | [1] | 0 | [1] | 421,000,000 | [1]
Initial term of credit facilities (in years) | 4 years |  |  |  |  |
Fixed Rate Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt including debt on real estate held for sale | 1,098,837,000 |  | 1,098,837,000 |  | 1,334,717,000 |
Weighted average interest rate |  |  | 5.20% |  |  |
Variable Rate Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt including debt on real estate held for sale | 343,524,000 |  | 343,524,000 |  | 556,836,000 |
Weighted average interest rate |  |  | 1.63% |  |  |
Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt including debt on real estate held for sale | 632,571,000 |  | 632,571,000 |  | 744,509,000 |
Weighted average interest rate |  |  | 5.12% |  |  |
Fannie Mae credit facilities [Member] | Variable Rate Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt including debt on real estate held for sale | 211,409,000 |  | 211,409,000 |  | 310,451,000 |
Weighted average interest rate |  |  | 2.08% |  |  |
Mortgage notes payable [Member] | Fixed Rate Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt including debt on real estate held for sale | 466,266,000 |  | 466,266,000 |  | 590,208,000 |
Weighted average interest rate |  |  | 5.31% |  |  |
Notes payable minimum interest rates range | 3.43% |  |  |  |  |
Notes payable maximum interest rates range | 6.54% |  |  |  |  |
Mortgage notes payable [Member] | Variable Rate Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt including debt on real estate held for sale | 37,415,000 |  | 37,415,000 |  | 151,685,000 |
Weighted average interest rate |  |  | 1.06% |  |  |
Notes payable minimum interest rates range | 1.06% |  |  |  |  |
Tax Exempt Notes Payable [Member] | Variable Rate Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt including debt on real estate held for sale | 94,700,000 |  | 94,700,000 |  | 94,700,000 |
Weighted average interest rate |  |  | 0.85% |  |  |
Unsecured Revolving Credit Facility due October 2015 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowings outstanding | 0 | [2],[3] | 0 | [2],[3] | 421,000,000 | [2],[3]
4.25% Medium-Term Notes due June 2018 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Unamortized fair market adjustment | 2,536,000 |  | 2,536,000 |  | 2,751,000 |
4.63% Medium-Term Notes due January 2022 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Unamortized fair market adjustment | 3,420,000 |  | 3,420,000 |  |  |
United Dominion Reality L.P. [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt including debt on real estate held for sale | 970,255,000 |  | 970,255,000 |  | 1,189,645,000 |
Weighted average interest rate |  |  | 4.47% |  |  |
Unamortized fair market adjustment | 15,700,000 |  | 15,700,000 |  | 17,800,000 |
United Dominion Reality L.P. [Member] | UDR Bank Credit Facility [Member] | Financial Guarantee [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Guarantor borrowing capacity | 900,000,000 |  | 900,000,000 |  |  |
United Dominion Reality L.P. [Member] | Fixed Rate Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt including debt on real estate held for sale | 768,653,000 |  | 768,653,000 |  | 902,622,000 |
Weighted average interest rate |  |  | 5.11% |  |  |
United Dominion Reality L.P. [Member] | Variable Rate Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt including debt on real estate held for sale | 201,602,000 |  | 201,602,000 |  | 287,023,000 |
Weighted average interest rate |  |  | 2.03% |  |  |
United Dominion Reality L.P. [Member] | Fannie Mae credit facilities [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt including debt on real estate held for sale | 508,000,000 |  | 508,000,000 |  |  |
United Dominion Reality L.P. [Member] | Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt including debt on real estate held for sale | 370,789,000 |  | 370,789,000 |  | 444,899,000 |
Weighted average interest rate |  |  | 4.90% |  |  |
United Dominion Reality L.P. [Member] | Fannie Mae credit facilities [Member] | Variable Rate Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt including debt on real estate held for sale | 137,187,000 |  | 137,187,000 |  | 222,608,000 |
Weighted average interest rate |  |  | 2.55% |  |  |
United Dominion Reality L.P. [Member] | Mortgage notes payable [Member] | Fixed Rate Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt including debt on real estate held for sale | 397,864,000 |  | 397,864,000 |  | 457,723,000 |
Weighted average interest rate |  |  | 5.31% |  |  |
Notes payable minimum interest rates range | 3.43% |  |  |  |  |
Notes payable maximum interest rates range | 5.94% |  |  |  |  |
United Dominion Reality L.P. [Member] | Mortgage notes payable [Member] | Variable Rate Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt including debt on real estate held for sale | 37,415,000 |  | 37,415,000 |  | 37,415,000 |
Weighted average interest rate |  |  | 1.06% |  |  |
United Dominion Reality L.P. [Member] | Tax Exempt Notes Payable [Member] | Variable Rate Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt including debt on real estate held for sale | 27,000,000 |  | 27,000,000 |  | 27,000,000 |
Weighted average interest rate |  |  | 0.71% |  |  |
United Dominion Reality L.P. [Member] | 2.90% Term Notes due January 2016 [Member] | Financial Guarantee [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Guarantor borrowing capacity | 250,000,000 |  | 250,000,000 |  |  |
United Dominion Reality L.P. [Member] | 1.68% Term Notes due December 2016 [Member] | Financial Guarantee [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Guarantor borrowing capacity | 100,000,000 |  | 100,000,000 |  |  |
United Dominion Reality L.P. [Member] | 4.25% Medium-Term Notes due June 2018 [Member] | Financial Guarantee [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Guarantor borrowing capacity | 300,000,000 |  | 300,000,000 |  |  |
United Dominion Reality L.P. [Member] | 4.63% Medium-Term Notes due January 2022 [Member] | Financial Guarantee [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Guarantor borrowing capacity | $ 400,000,000 |  | $ 400,000,000 |  |  |
[1] | Excludes $4.1 million of letters of credit at June 30, 2012.
[2] | The Company has a $900 million unsecured revolving credit facility. The unsecured credit facility has an initial term of four years and includes a one-year extension option. It contains an accordion feature that allows the Company to increase the facility to $1.35 billion. The credit facility carries an interest rate equal to LIBOR plus a spread of 122.5 basis points and a facility fee of 22.5 basis points.
[3] | The Operating Partnership is a guarantor at June 30, 2012 and December 31, 2011.

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