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Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2014 Segments | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2012 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |
Same Store Communities | 36,268 |  | 35,177 |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |
Reportable apartment home segment rental income | $ 206,752 | $ 191,124 | $ 608,497 | $ 565,510 |  |
Reportable apartment home segment NOI | 139,814 | 128,643 | 412,330 |  | 382,612 |
Reconciling items: |  |  |  |  |  |
Joint venture management and other fees | 3,165 | 3,207 | 9,599 | 9,347 | 9,347 |
Property management | (5,599) | (5,236) | (16,474) |  | (15,491) |
Other operating expenses | (2,012) | (1,787) | (6,118) |  | (5,237) |
Real estate depreciation and amortization | 89,339 | 83,738 | 266,748 | 251,231 |  |
General and administrative | (11,554) | (11,364) | (36,078) |  | (30,706) |
Casualty (Recoveries)/Charges | 0 | 6,460 | (500) | 12,253 | (12,253) |
Other depreciation and amortization | (1,385) | (1,176) | (3,658) | (3,460) | (3,460) |
Income/(loss) from unconsolidated entities | (939) | (3,794) | (4,932) | (6,081) | (6,081) |
Interest expense | (33,087) | (30,939) | (97,662) | (92,723) | (92,723) |
Interest and other income/(expense), net | 9,061 | 829 | 11,902 |  | 3,291 |
Gains/(loss) on sales of real estate, net of tax | 31,302 | 0 | 82,305 | 0 |  |
Tax benefit, net | 2,490 | 2,658 | 8,049 |  | 7,314 |
Gain on sale of real estate owned, net of tax | 31,377 | 0 | 82,380 | 0 |  |
Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership | (1,447) | (84) | (3,171) | (198) | (198) |
Net (income)/loss attributable to noncontrolling interests | 4 | 37 | (2) |  | 30 |
Net income/(loss) attributable to UDR, Inc. | 40,549 | 3,188 | 88,917 | 8,112 | 8,112 |
Reportable apartment home segment assets: |  |  |  |  |  |
Total segment assets | 8,428,291 |  | 8,428,291 |  |  | 8,207,977
Accumulated depreciation | (2,379,033) |  | (2,379,033) |  |  | (2,208,794)
Total segment asset - net book value | 6,049,258 |  | 6,049,258 |  |  | 5,999,183
Reconciling items: |  |  |  |  |  |
Cash and cash equivalents | 14,605 | 11,149 | 14,605 | 11,149 | 12,115 | 30,249
Restricted cash | 23,969 |  | 23,969 |  |  | 22,796
Deferred financing costs, net | 24,344 |  | 24,344 |  |  | 26,924
Notes receivable, net | 18,318 |  | 18,318 |  |  | 83,033
Investment in and advances to unconsolidated joint ventures, net | (650,441) |  | (650,441) |  |  | (507,655)
Other assets | 117,153 |  | 117,153 |  |  | 137,882
Total consolidated assets | 6,898,088 |  | 6,898,088 |  |  | 6,807,722
Reportable Segment (Textual) [Abstract] |  |  |  |  |  |
Number of reportable segments | 2 |  |  |  |  |
Condition for Community considered to have stabilized occupancy |  |  | 90% occupancy for at least three consecutive months |  |  |
Number of Tenants or related group of tenants that contributed 10% or more of company total revenue | 0 | 0 | 0 | 0 |  |
Same-Store [Member] |  |  |  |  |  |
Reportable Segment (Textual) [Abstract] |  |  |  |  |  |
SEC Schedule III, Real Estate, Improvements | 15,100 | 14,500 | 36,500 |  | 34,600 |
Same Store Communities Western Region [Member] |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |
Reportable apartment home segment rental income | 68,275 | 64,195 | 189,075 |  | 177,884 |
Reportable apartment home segment NOI | 49,110 | 45,699 | 136,587 |  | 126,860 |
Reportable apartment home segment assets: |  |  |  |  |  |
Total segment assets | 2,591,838 |  | 2,591,838 |  |  | 2,412,091
Same Store Communities Mid-Atlantic Region [Member] |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |
Reportable apartment home segment rental income | 40,479 | 40,164 | 121,356 |  | 119,937 |
Reportable apartment home segment NOI | 27,622 | 27,629 | 83,581 |  | 83,287 |
Reportable apartment home segment assets: |  |  |  |  |  |
Total segment assets | 1,404,730 |  | 1,404,730 |  |  | 1,395,772
Same Store Communities Northeast Region [Member] |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |
Reportable apartment home segment rental income | 20,721 | 19,806 | 45,331 |  | 43,441 |
Reportable apartment home segment NOI | 15,571 | 14,678 | 33,361 |  | 31,409 |
Reportable apartment home segment assets: |  |  |  |  |  |
Total segment assets | 1,073,905 |  | 1,073,905 |  |  | 1,066,260
Same Store Communities Southeastern Region [Member] |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |
Reportable apartment home segment rental income | 27,210 | 25,851 | 80,578 |  | 76,763 |
Reportable apartment home segment NOI | 17,480 | 16,560 | 53,329 |  | 49,866 |
Reportable apartment home segment assets: |  |  |  |  |  |
Total segment assets | 783,641 |  | 783,641 |  |  | 785,134
Same Store Communities Southwestern Region [Member] |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |
Reportable apartment home segment rental income | 13,859 | 13,293 | 40,949 |  | 39,012 |
Reportable apartment home segment NOI | 8,509 | 7,983 | 25,130 |  | 23,751 |
Reportable apartment home segment assets: |  |  |  |  |  |
Total segment assets | 438,982 |  | 438,982 |  |  | 434,875
Non-Mature communities/Other [Member] |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |
Reportable apartment home segment rental income | 33,064 | 27,070 | 121,756 |  | 106,256 |
Reportable apartment home segment NOI | 21,522 | 16,094 | 80,342 |  | 67,439 |
Reportable apartment home segment assets: |  |  |  |  |  |
Total segment assets | 2,135,195 |  | 2,135,195 |  |  | 2,113,845
Reportable Segment (Textual) [Abstract] |  |  |  |  |  |
SEC Schedule III, Real Estate, Improvements | 1,343 | 1,567 | 5,001 |  | 4,800 |
Total Communities [Member] |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |
Reportable apartment home segment rental income | 203,608 | 190,379 | 599,045 |  | 563,293 |
United Dominion Reality L.P. [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Same Store Communities | 19,518 |  | 19,010 |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |
Reportable apartment home segment NOI | 75,753 | 71,993 | 223,138 |  | 214,573 |
Reconciling items: |  |  |  |  |  |
Property management | (2,955) | (2,860) | (8,653) |  | (8,436) |
Other operating expenses | (1,484) | (1,405) | (4,371) |  | (4,215) |
Real estate depreciation and amortization | 45,043 | 44,333 | 134,011 | 133,962 |  |
General and administrative | (6,939) | (6,855) | (21,368) |  | (18,324) |
Casualty (Recoveries)/Charges | 0 | 3,807 | (500) | 8,083 | (8,083) |
Interest expense | (10,457) | (8,773) | (30,629) |  | (27,085) |
Gains/(loss) on sales of real estate, net of tax | 0 | 0 | 40,687 | 0 |  |
Net (income)/loss attributable to noncontrolling interests | (238) | (39) | (697) |  | (151) |
Net income/(loss) attributable to UDR, Inc. | 8,637 | 11,011 | 63,596 | 28,893 | 28,893 |
Reportable apartment home segment assets: |  |  |  |  |  |
Total segment assets | 4,219,223 |  | 4,219,223 |  |  | 4,188,480
Accumulated depreciation | (1,358,123) |  | (1,358,123) |  |  | (1,241,574)
Total segment asset - net book value | 2,861,100 |  | 2,861,100 |  |  | 2,946,906
Reconciling items: |  |  |  |  |  |
Cash and cash equivalents | 1,484 | 2,422 | 1,484 | 2,422 | 2,804 | 1,897
Restricted cash | 13,989 |  | 13,989 |  |  | 13,526
Deferred financing costs, net | 4,783 |  | 4,783 |  |  | 5,848
Other assets | 25,070 |  | 25,070 |  |  | 25,064
Total consolidated assets | 2,906,426 |  | 2,906,426 |  |  | 2,993,241
Reportable Segment (Textual) [Abstract] |  |  |  |  |  |
Related Party Transaction, Management Fee Percentage |  |  | 2.75% |  |  |
Number of reportable segments | 2 |  |  |  |  |
Number of Tenants or related group of tenants that contributed 10% or more of company total revenue | 0 | 0 | 0 | 0 |  |
United Dominion Reality L.P. [Member] | Same-Store [Member] |  |  |  |  |  |
Reportable Segment (Textual) [Abstract] |  |  |  |  |  |
SEC Schedule III, Real Estate, Improvements | 8,600 | 6,900 | 20,000 |  | 18,500 |
United Dominion Reality L.P. [Member] | Same Store Communities Western Region [Member] |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |
Reportable apartment home segment rental income | 49,279 | 46,246 | 144,252 |  | 135,418 |
Reportable apartment home segment NOI | 35,801 | 33,307 | 105,375 |  | 97,533 |
Reportable apartment home segment assets: |  |  |  |  |  |
Total segment assets | 1,742,559 |  | 1,742,559 |  |  | 1,733,144
United Dominion Reality L.P. [Member] | Same Store Communities Mid-Atlantic Region [Member] |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |
Reportable apartment home segment rental income | 17,169 | 17,105 | 51,779 |  | 51,095 |
Reportable apartment home segment NOI | 11,422 | 11,483 | 34,888 |  | 34,689 |
Reportable apartment home segment assets: |  |  |  |  |  |
Total segment assets | 710,277 |  | 710,277 |  |  | 706,447
United Dominion Reality L.P. [Member] | Same Store Communities Northeast Region [Member] |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |
Reportable apartment home segment rental income | 14,968 | 14,331 | 28,410 |  | 27,414 |
Reportable apartment home segment NOI | 11,609 | 10,789 | 21,448 |  | 20,083 |
Reportable apartment home segment assets: |  |  |  |  |  |
Total segment assets | 776,310 |  | 776,310 |  |  | 770,937
United Dominion Reality L.P. [Member] | Same Store Communities Southeastern Region [Member] |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |
Reportable apartment home segment rental income | 11,368 | 10,841 | 33,753 |  | 32,177 |
Reportable apartment home segment NOI | 7,327 | 6,957 | 22,286 |  | 20,898 |
Reportable apartment home segment assets: |  |  |  |  |  |
Total segment assets | 331,727 |  | 331,727 |  |  | 328,150
United Dominion Reality L.P. [Member] | Same Store Communities Southwestern Region [Member] |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |
Reportable apartment home segment rental income | 6,667 | 6,508 | 19,873 |  | 19,098 |
Reportable apartment home segment NOI | 4,192 | 4,040 | 12,578 |  | 11,987 |
Reportable apartment home segment assets: |  |  |  |  |  |
Total segment assets | 227,886 |  | 227,886 |  |  | 226,252
United Dominion Reality L.P. [Member] | Non-Mature communities/Other [Member] |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |
Reportable apartment home segment rental income | 7,993 | 8,966 | 36,589 |  | 41,564 |
Reportable apartment home segment NOI | 5,402 | 5,417 | 26,563 |  | 29,383 |
Reportable apartment home segment assets: |  |  |  |  |  |
Total segment assets | 430,464 |  | 430,464 |  |  | 423,550
Reportable Segment (Textual) [Abstract] |  |  |  |  |  |
SEC Schedule III, Real Estate, Improvements | 137 | 436 | 555 |  | 1,497 |
United Dominion Reality L.P. [Member] | Total Communities [Member] |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |
Reportable apartment home segment rental income | 107,444 | 103,997 | 314,656 |  | 306,766 |
Taxable REIT Subsidiaries [Member] | United Dominion Reality L.P. [Member] |  |  |  |  |  |
Reportable Segment (Textual) [Abstract] |  |  |  |  |  |
Related Party Transaction, Management Fee Percentage |  |  | 2.75% |  |  |
Segment Reconciling Items [Member] |  |  |  |  |  |
Reconciling items: |  |  |  |  |  |
Real estate depreciation and amortization | 89,339 | 84,266 | 266,748 |  | 252,839 |
Segment Reconciling Items [Member] | United Dominion Reality L.P. [Member] |  |  |  |  |  |
Reconciling items: |  |  |  |  |  |
Real estate depreciation and amortization | $ 45,043 | $ 44,857 | $ 134,011 |  | $ 135,552 |

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- Definition Carrying amount of the equity interests owned by noncontrolling shareholders, partners, or other equity holders in joint ventures included in the entity's consolidated financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4568740-111683 + Details
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- Definition Amount of Net Income (Loss) attributable to redeemable noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.19) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + 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 210.5-02.3) -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 3 -Article 5 + Details
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