XML 120 R95.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Stockholders' Equity Stockholders' Equity (Details) - shares | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership, Shares |  | 112,174 |  |  |
Stock Issued During Period, Shares, New Issues |  | 3,439,636 |  |  |
Common Stock |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | 0 |  |  |  |
Series E Preferred Stock [Member] |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | 0 |  |  |  |
Common Stock |  |  |  |  |
Shares, Issued | 261,844,521 | 261,844,521 | 255,114,603 | 250,749,665 | 250,139,408
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership, Shares |  | 112,174 | 153,451 | 76,291 |
Stock Issued During Period, Shares, New Issues |  | 6,339,636 | 3,410,433 |  |
Common Stock | Series E Preferred Stock [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 7,480 |  |  |
Preferred Stock |  |  |  |  |
Redemption of 6.75% Series G Cumulative Redeemable Shares, Shares |  | 0 |  |  |
Preferred Stock | Series F Preferred Stock [Member] |  |  |  |  |
Shares, Issued | 16,452,496 | 16,452,496 | 2,464,183 | 2,464,183 | 2,464,183
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares |  | 0 | 0 | 0 |
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership, Shares |  | 0 | 0 | 0 |
Redemption of 6.75% Series G Cumulative Redeemable Shares, Shares |  | 0 | 0 |  |
Preferred Stock | Series E Preferred Stock [Member] |  |  |  |  |
Shares, Issued | 2,796,903 | 2,796,903 | 2,803,812 | 2,803,812 | 2,803,812
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares |  | 0 | 0 | 0 |
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership, Shares |  | 0 | 0 | 0 |
Redemption of 6.75% Series G Cumulative Redeemable Shares, Shares |  | 6,909 | 0 |  |
Home Acquisition [Member] |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | 16,100,000 |  |  |  |
Home Acquisition [Member] | Series F Preferred Stock [Member] |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | 13,988,313 | 270,628 | 801,054 | 533,966 |

X
- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
Name: | us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
Name: | us-gaap_SharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of shares issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 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 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of stock bought back by the entity at the exercise price or redemption price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
Name: | us-gaap_StockRedeemedOrCalledDuringPeriodShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_SeriesEPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_PreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_SeriesFPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=udr_HomeAcquisitionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |