Fair value of fixed rate secured debt instruments as of the balance sheet date.

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Secured debt including debt on real estate held for sale.

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Fair value of variable rate secured debt instruments as of the balance sheet date.

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The average effective interest rate during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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-Name Accounting Standards Codification

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When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

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When presenting a range of interest rates, the lowest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

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Earliest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

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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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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

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-Paragraph 1A

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

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Weighted average interest rate of debt outstanding.

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No definition available.

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)(1)

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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-Subparagraph (SX 210.9-03.16)

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-Number 210

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Debt (UNITED DOMINION REALTY, L.P.) (Details Textual) - USD ($)			3 Months Ended	6 Months Ended
	Jun. 27, 2014	Sep. 26, 2013	Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Borrowings outstanding			$ 2,300,000	$ 2,300,000	$ 1,900,000
Weighted average interest rate			3.58%
Unamortized fair market adjustment			$ 5,700,000	5,700,000	6,700,000
UDR Bank Credit Facility [Member]
Debt Instrument [Line Items]
Total revolving credit facility			900,000,000	900,000,000	900,000,000
Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Secured debt including debt on real estate held for sale			$ 975,024,000	975,024,000	969,296,000
Weighted average interest rate			5.28%
Variable Rate Debt [Member]
Debt Instrument [Line Items]
Secured debt including debt on real estate held for sale			$ 375,415,000	375,415,000	392,233,000
Weighted average interest rate			1.45%
Fannie Mae [Member]
Debt Instrument [Line Items]
Borrowings outstanding			$ 815,666,000	$ 815,666,000	834,282,000
Fannie Mae credit facilities [Member] \| Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, Start				May 01, 2017
Debt Instrument, Maturity Date Range, End				Jul. 01, 2023
Debt, Weighted Average Interest Rate			5.12%	5.12%
Fannie Mae credit facilities [Member] \| Variable Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate at Period End			1.63%	1.63%
Mortgages [Member] \| Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, Start				Dec. 09, 2015
Weighted average interest rate			5.50%
Notes payable minimum interest rates range				3.43%
Notes payable maximum interest rates range				6.16%
Debt Instrument, Maturity Date Range, End				May 01, 2019
Mortgages [Member] \| Variable Rate Debt [Member]
Debt Instrument [Line Items]
Weighted average interest rate			1.94%
Tax Exempt Notes Payable [Member] \| Variable Rate Debt [Member]
Debt Instrument [Line Items]
Weighted average interest rate			0.84%
Unsecured Revolving Credit Facility due October 2015 [Member]
Debt Instrument [Line Items]
Borrowings outstanding			$ 457,000,000	$ 457,000,000	152,500,000
Weighted average interest rate			1.12%
2.90% Term Notes due January 2016 [Member]
Debt Instrument [Line Items]
Weighted average interest rate				1.70%
Five Point Two Five Percent, Medium Term Notes, Due January 2016 [Member]
Debt Instrument [Line Items]
Weighted average interest rate				5.25%
4.25% Medium-Term Notes due June 2018 [Member]
Debt Instrument [Line Items]
Weighted average interest rate				4.25%
Unamortized fair market adjustment			$ 1,251,000	$ 1,251,000	1,465,000
Three point seven percent medium term note due October 2020 [Member]
Debt Instrument [Line Items]
Unamortized fair market adjustment			$ 42,000	$ 42,000	46,000
ThreePointSevenTermNotesDueOctober2020 [Member]
Debt Instrument [Line Items]
Weighted average interest rate				3.70%
Debt Instrument, Maturity Date		Oct. 31, 2020
4.63% Medium-Term Notes due January 2022 [Member]
Debt Instrument [Line Items]
Weighted average interest rate			4.63%
Unamortized fair market adjustment			$ 2,344,000	$ 2,344,000	2,523,000
3.75 MTN Due July 2024 [Member]
Debt Instrument [Line Items]
Weighted average interest rate			3.75%
Unamortized fair market adjustment			$ 938,000	938,000	990,000
Debt Instrument, Maturity Date	Jul. 01, 2024
United Dominion Reality L.P. [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Premium			4,200,000	4,200,000	6,200,000
Secured debt including debt on real estate held for sale			912,567,000	$ 912,567,000	931,959,000
Weighted average interest rate				4.43%
United Dominion Reality L.P. [Member] \| Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Secured debt including debt on real estate held for sale			708,058,000	$ 708,058,000	712,199,000
Weighted average interest rate				5.21%
United Dominion Reality L.P. [Member] \| Variable Rate Debt [Member]
Debt Instrument [Line Items]
Secured debt including debt on real estate held for sale			204,509,000	$ 204,509,000	219,760,000
Weighted average interest rate				1.74%
United Dominion Reality L.P. [Member] \| Fannie Mae [Member]
Debt Instrument [Line Items]
Borrowings outstanding			511,511,000	$ 511,511,000	526,588,000
United Dominion Reality L.P. [Member] \| Fannie Mae credit facilities [Member] \| Fixed Rate Debt [Member]
Debt Instrument [Line Items]
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]
Weighted average interest rate				1.88%
United Dominion Reality L.P. [Member] \| Mortgages [Member] \| Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Secured debt including debt on real estate held for sale			374,056,000	$ 374,056,000	378,371,000
Weighted average interest rate				5.49%
Notes payable maximum interest rates range				5.94%
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				0.85%
Debt Instrument, Maturity Date Range, End				Mar. 01, 2032
United Dominion Reality L.P. [Member] \| 2.90% Term Notes due January 2016 [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, End				Jun. 01, 2018
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] \| Five Point Two Five Percent, Medium Term Notes, Due January 2016 [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, End				Jun. 01, 2018
United Dominion Reality L.P. [Member] \| 4.25% Medium-Term Notes due June 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, End				Jun. 01, 2018
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] \| Three point seven percent medium term note due October 2020 [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]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, End				Jan. 01, 2022
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
United Dominion Reality L.P. [Member] \| 3.75 MTN Due July 2024 [Member] \| Financial Guarantee [Member]
Debt Instrument [Line Items]
Guarantor borrowing capacity			300,000,000	300,000,000
Mortgages [Member] \| Fair Value, Measurements, Recurring [Member] \| Carrying (Reported) Amount, Fair Value Disclosure [Member] \| Mortgages [Member] \| Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Secured debt including debt on real estate held for sale			408,736,000	408,736,000	401,210,000
Mortgages [Member] \| Fair Value, Measurements, Recurring [Member] \| Carrying (Reported) Amount, Fair Value Disclosure [Member] \| Mortgages [Member] \| Variable Rate Debt [Member]
Debt Instrument [Line Items]
Secured debt including debt on real estate held for sale			31,337,000	31,337,000	31,337,000
Mortgages [Member] \| Fair Value, Measurements, Recurring [Member] \| Carrying (Reported) Amount, Fair Value Disclosure [Member] \| United Dominion Reality L.P. [Member]
Debt Instrument [Line Items]
Fixed Rate Secured Debt Instruments Fair Value			374,056,000	374,056,000	378,371,000
Fannie Mae credit facilities [Member] \| Fair Value, Measurements, Recurring [Member] \| Carrying (Reported) Amount, Fair Value Disclosure [Member] \| Fannie Mae credit facilities [Member] \| Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Secured debt including debt on real estate held for sale			566,288,000	566,288,000	568,086,000
Fannie Mae credit facilities [Member] \| Fair Value, Measurements, Recurring [Member] \| Carrying (Reported) Amount, Fair Value Disclosure [Member] \| Fannie Mae credit facilities [Member] \| Variable Rate Debt [Member]
Debt Instrument [Line Items]
Secured debt including debt on real estate held for sale			249,378,000	249,378,000	266,196,000
Fannie Mae credit facilities [Member] \| Fair Value, Measurements, Recurring [Member] \| Carrying (Reported) Amount, Fair Value Disclosure [Member] \| United Dominion Reality L.P. [Member]
Debt Instrument [Line Items]
Variable Rate Secured Debt Instruments Fair Value			177,509,000	177,509,000	192,760,000
Fixed Rate Secured Debt Instruments Fair Value			334,002,000	334,002,000	333,828,000
Fannie Mae credit facilities [Member] \| Fair Value, Measurements, Recurring [Member] \| Carrying (Reported) Amount, Fair Value Disclosure [Member] \| 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			334,002,000	334,002,000	333,828,000
Fannie Mae credit facilities [Member] \| Fair Value, Measurements, Recurring [Member] \| Carrying (Reported) Amount, Fair Value Disclosure [Member] \| 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			$ 177,509,000	$ 177,509,000	$ 192,760,000