XML 156 R131.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Debt (UNITED DOMINION REALTY, L.P.) (Details Textual) - USD ($) |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 27, 2014 | Sep. 26, 2013 | Sep. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |  |  |
Amortization of Financing Costs |  |  |  | $ 7,000,000 | $ 7,200,000 |
Borrowings outstanding |  |  |  | $ 2,300,000 | 1,900,000 |
Debt Instrument, Interest Rate During Period |  |  |  | 3.74% |  |
UDR Bank Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total revolving credit facility |  |  |  | $ 2,000,000,000 | 900,000,000 |
Fixed Rate Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt Including Debt on Real Estate Held for Sale |  |  |  | $ 952,801,000 | 963,713,000 |
Debt Instrument, Interest Rate During Period |  |  |  | 4.93% |  |
Variable Rate Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt Including Debt on Real Estate Held for Sale |  |  |  | $ 424,144,000 | 390,608,000 |
Debt Instrument, Interest Rate During Period |  |  |  | 1.53% |  |
Fannie Mae |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowings outstanding |  |  |  | $ 813,840,000 | 834,282,000 |
Fannie Mae credit facilities | Fixed Rate Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  | 5.23% |  |
Debt Instrument, Maturity Date Range, Start |  |  |  | May 01, 2017 |  |
Debt Instrument, Maturity Date Range, End |  |  |  | Jul. 01, 2023 |  |
Fannie Mae credit facilities | Variable Rate Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate at Period End |  |  |  | 1.71% |  |
Mortgages [Member] | Fixed Rate Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate During Period |  |  |  | 4.57% |  |
Debt Instrument, Maturity Date Range, Start |  |  |  | Jun. 01, 2016 |  |
Debt Instrument, Maturity Date Range, End |  |  |  | Nov. 01, 2025 |  |
Notes payable minimum interest rates range |  |  |  | 3.43% |  |
Notes payable maximum interest rates range |  |  |  | 6.16% |  |
Mortgages [Member] | Variable Rate Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate During Period |  |  |  | 2.19% |  |
Tax-exempt secured notes payable | Variable Rate Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate During Period |  |  |  | 0.75% |  |
Unsecured Revolving Credit Facility due October 2015 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowings outstanding |  |  |  | $ 150,000,000 | 152,500,000 |
Debt Instrument, Interest Rate During Period |  |  |  | 1.19% |  |
Five Point Two Five Percent, Medium Term Notes, Due January 2016 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate During Period |  |  |  | 5.25% |  |
4.25% Medium-Term Notes due June 2018 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate During Period |  |  |  | 4.25% |  |
Three point seven percent medium term note due October 2020 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate During Period |  |  |  | 3.70% |  |
ThreePointSevenTermNotesDueOctober2020 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Maturity Date |  | Oct. 01, 2020 |  |  |  |
1.44% Term notes due January 2021 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate During Period |  |  |  | 1.44% |  |
Debt Instrument, Maturity Date | Jan. 29, 2021 |  |  |  |  |
4.63% Medium-Term Notes due January 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate During Period |  |  |  | 4.63% |  |
3.75 MTN Due July 2024 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate During Period |  |  |  | 3.75% |  |
Debt Instrument, Maturity Date | Jul. 31, 2024 |  |  |  |  |
4.00% MTN Due October 2025 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate During Period |  |  |  | 4.00% |  |
Debt Instrument, Maturity Date |  |  | Oct. 01, 2025 |  |  |
United Dominion Reality L.P. |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amortization of Financing Costs |  |  |  | $ 1,300,000 | 1,400,000 |
Secured Debt Including Debt on Real Estate Held for Sale |  |  |  | $ 475,964,000 | 927,484,000 |
Debt Instrument, Interest Rate During Period |  |  |  | 3.76% |  |
Reallocation of Credit Facilities Debt from General Partner |  |  |  | $ 17,557,000 | 0 | $ 13,682,000
Unamortized fair market adjustment |  |  |  | 0.0 | 6,200,000 |
United Dominion Reality L.P. | Fixed Rate Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt Including Debt on Real Estate Held for Sale |  |  |  | $ 279,333,000 | 708,534,000 |
Debt Instrument, Interest Rate During Period |  |  |  | 4.90% |  |
United Dominion Reality L.P. | Variable Rate Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt Including Debt on Real Estate Held for Sale |  |  |  | $ 196,631,000 | 218,950,000 |
Debt Instrument, Interest Rate During Period |  |  |  | 1.74% |  |
United Dominion Reality L.P. | Fannie Mae |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowings outstanding |  |  |  | $ 421,031,000 | 526,588,000 |
United Dominion Reality L.P. | Fannie Mae credit facilities | Fixed Rate Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate During Period |  |  |  | 5.08% |  |
United Dominion Reality L.P. | Fannie Mae credit facilities | Variable Rate Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate During Period |  |  |  | 1.90% |  |
United Dominion Reality L.P. | Mortgages [Member] | Fixed Rate Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt Including Debt on Real Estate Held for Sale |  |  |  | $ 30,132,000 | 378,371,000 |
Debt Instrument, Interest Rate During Period |  |  |  | 3.43% |  |
Notes payable minimum interest rates range |  |  |  | 3.43% |  |
United Dominion Reality L.P. | Tax-exempt secured notes payable | Variable Rate Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt Including Debt on Real Estate Held for Sale |  |  |  | $ 27,000,000 | 27,000,000 |
Debt Instrument, Interest Rate During Period |  |  |  | 0.76% |  |
Debt Instrument, Maturity Date Range, End |  |  |  | Mar. 01, 2032 |  |
United Dominion Reality L.P. | 2.90% Term Notes due January 2016 | Financial Guarantee |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Guarantor borrowing capacity |  |  |  | $ 250,000,000 |  |
United Dominion Reality L.P. | 1.68% Term Notes due December 2016 | Financial Guarantee |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Guarantor borrowing capacity |  |  |  | $ 100,000,000 |  |
United Dominion Reality L.P. | 4.25% Medium-Term Notes due June 2018 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Maturity Date Range, End |  |  | Jun. 01, 2018 |  |  |
United Dominion Reality L.P. | 4.25% Medium-Term Notes due June 2018 | Financial Guarantee |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Guarantor borrowing capacity |  |  | $ 300,000,000 |  |  |
United Dominion Reality L.P. | Three point seven percent medium term note due October 2020 [Member] | Financial Guarantee |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Guarantor borrowing capacity |  |  | 300,000,000 |  |  |
United Dominion Reality L.P. | 1.44% Term notes due January 2021 [Member] | Financial Guarantee |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Guarantor borrowing capacity |  |  | $ 350,000,000 |  |  |
United Dominion Reality L.P. | 4.63% Medium-Term Notes due January 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Maturity Date Range, End |  |  | Jan. 01, 2022 |  |  |
United Dominion Reality L.P. | 4.63% Medium-Term Notes due January 2022 | Financial Guarantee |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Guarantor borrowing capacity |  |  | $ 400,000,000 |  |  |
United Dominion Reality L.P. | 3.75 MTN Due July 2024 [Member] | Financial Guarantee |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Guarantor borrowing capacity |  |  | 300,000,000 |  |  |
United Dominion Reality L.P. | 4.00% MTN Due October 2025 [Member] | Financial Guarantee |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Guarantor borrowing capacity |  |  | $ 300,000,000 |  |  |
Beginning of range of initial term of debt [Member] | Fannie Mae credit facilities |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Term |  |  |  | 7 years |  |
End of range of inital term of debt [Member] | Fannie Mae credit facilities |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Term |  |  |  | 10 years |  |
Fannie Mae credit facilities | Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Fannie Mae credit facilities | Fixed Rate Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt Including Debt on Real Estate Held for Sale |  |  |  | $ 514,462,000 | 568,086,000 |
Fannie Mae credit facilities | Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Fannie Mae credit facilities | Variable Rate Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt Including Debt on Real Estate Held for Sale |  |  |  | 299,378,000 | 266,196,000 |
Fannie Mae credit facilities | Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | United Dominion Reality L.P. | Fannie Mae credit facilities | Fixed Rate Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt Including Debt on Real Estate Held for Sale |  |  |  | 250,828,000 | 333,828,000 |
Fannie Mae credit facilities | Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | United Dominion Reality L.P. | Fannie Mae credit facilities | Variable Rate Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt Including Debt on Real Estate Held for Sale |  |  |  | 170,203,000 | 192,760,000 |
Mortgages [Member] | Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Mortgages [Member] | Fixed Rate Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt Including Debt on Real Estate Held for Sale |  |  |  | 442,617,000 | 401,210,000 |
Mortgages [Member] | Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Mortgages [Member] | Variable Rate Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt Including Debt on Real Estate Held for Sale |  |  |  | $ 31,337,000 | $ 31,337,000 |

X
- Definition Reallocation of Credit Facilities Debt from General Partner + References No definition available. + Details
Name: | udr_ReallocationofCreditFacilitiesDebtfromGeneralPartner
Namespace Prefix: | udr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Secured debt including debt on real estate held for sale. + References No definition available. + Details
Name: | udr_SecuredDebtIncludingDebtOnRealEstateHeldForSale
Namespace Prefix: | udr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 + Details
Name: | us-gaap_AmortizationOfFinancingCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition 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 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
Name: | us-gaap_DebtInstrumentInterestRateDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
Name: | us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
Name: | us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition When presenting a range of interest rates, the lowest effective rate for funds borrowed under the debt agreement as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
Name: | us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMinimum
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition 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. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
Name: | us-gaap_DebtInstrumentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
Name: | us-gaap_DebtInstrumentMaturityDateRangeEnd1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Earliest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
Name: | us-gaap_DebtInstrumentMaturityDateRangeStart1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentUnamortizedPremium
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
Name: | us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
Name: | us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=udr_UdrBankCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=udr_FixedRateDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=udr_VariableRateDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_FannieMaeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_MortgagesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_TaxExemptNotesPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_UnsecuredRevolvingCreditFacilityDueOctoberTwoThousandFifteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_FivePointTwoFivePercentMediumTermNotesDueJanuary2016Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_FourPointTwoFivePercentageMediumTermNotesDueJune2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_ThreepointsevenpercentmediumtermnotedueOctober2020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_ThreePointSevenTermNotesDueOctober2020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_A1.44TermnotesdueJanuary2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_FourPointSixThreePercentTermMediumNotesDueJanuaryTwoThousandTwentyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_A3.75MTNDueJuly2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_A4.00MTNDueOctober2025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=udr_UnitedDominionRealityLPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_TwoPointNineZeroPercentTermNotesDueJanuaryTwoThousandSixteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_FinancialGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=udr_TwoPointSixEightPercentTermNotesDueDecemberTwoThousandSixteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | udr_RangeofinitaltermofdebtAxis=udr_BeginningofrangeofinitialtermofdebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | udr_RangeofinitaltermofdebtAxis=udr_EndofrangeofinitaltermofdebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_CarryingReportedAmountFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_MortgagesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |