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Secured and Unsecured Debt (Details Textual 1) (USD $) | 1 Months Ended | 3 Months Ended |  | 3 Months Ended |  | 0 Months Ended | 9 Months Ended |  |  | 3 Months Ended | 12 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  |  |  | 12 Months Ended | 3 Months Ended
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Jun. 30, 2013 | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 Five Point Five Zero Percent, Medium Term Notes, Due April 2014 [Member] | Dec. 31, 2013 Five Point Five Zero Percent, Medium Term Notes, Due April 2014 [Member] | Sep. 26, 2013 ThreePointSevenTermNotesDueOctober2020 [Member] | Sep. 30, 2014 ThreePointSevenTermNotesDueOctober2020 [Member] | Dec. 31, 2013 ThreePointSevenTermNotesDueOctober2020 [Member] | Sep. 30, 2013 ThreePointSevenTermNotesDueOctober2020 [Member] | Sep. 30, 2014 1.67% Term Notes due December 2016 [Member] | Dec. 31, 2012 1.67% Term Notes due December 2016 [Member] | Dec. 31, 2013 1.67% Term Notes due December 2016 [Member] | Sep. 30, 2014 2.90% Term Notes due January 2016 [Member] | Dec. 31, 2013 2.90% Term Notes due January 2016 [Member] | Sep. 30, 2014 4.63% Medium-Term Notes due January 2022 [Member] | Dec. 31, 2013 4.63% Medium-Term Notes due January 2022 [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 UDR Bank Credit Facility [Member] | Dec. 31, 2013 UDR Bank Credit Facility [Member] | Dec. 31, 2012 Beginning of range of initial term of debt [Member] Line of Credit [Member] | Sep. 30, 2014 Fannie Mae [Member]
Unsecured Debt (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revolving credit facility |  | $ 835,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 900,000,000 | $ 900,000,000 |  |
Increase in maximum borrowing capacity of unsecured revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,450,000,000 |  |  |
Credit facility interest rate | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Description | 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  | 5.50% | 5.50% |  |  | 0.00% | 3.70% | 1.30% |  | 1.65% | 2.73% | 2.90% | 4.63% | 4.63% | 2.50% | 2.68% |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.10% | 1.30% |  |
Line of Credit Facility, Amount Outstanding |  | 2,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 160,000,000 | 0 |  |
Debt Instrument, Maturity Date |  |  |  |  |  | Oct. 31, 2020 |  |  |  |  | Jun. 01, 2018 |  |  |  |  |  |  |  |  |  |  |
Unamortized discount |  | 8,000,000 | 11,800,000 | 3,000 | 20,000 |  |  |  |  |  |  |  |  |  | 2,792,000 | 2,882,000 |  |  |  |  |  |
Senior Notes |  |  |  | $ 0 | $ 128,480,000 |  | $ 299,952,000 | $ 299,946,000 |  | $ 35,000,000 |  | $ 35,000,000 | $ 215,000,000 | $ 250,000,000 | $ 397,387,000 | $ 397,118,000 | $ 100,000,000 | $ 65,000,000 |  |  |  |
Debt Instrument, Interest Rate During Period |  | 3.98% |  | 0.00% |  |  | 3.70% |  |  | 1.30% |  |  | 2.17% |  | 4.63% |  | 1.53% |  |  |  |  |
Debt Instrument, Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years | 10 years

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- Definition Increment in unsecured revolving credit facility under certain circumstances. + References No definition available. + Details
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- 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 + Details
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- 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: 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 + Details
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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + 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
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- 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
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + 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(a)) -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 03 -Paragraph 16 -Article 9 + Details
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