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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012
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Real Estate Properties [Line Items] |
Costs incurred to date | $ 332,737
Expected costs to complete | 368,080
Wholly owned under development [Member] |
Real Estate Properties [Line Items] |
Number of Properties | 5
Costs incurred to date | 282,006
Expected costs to complete | 319,094
Ownership stake | 100.00%
Consolidated Joint Ventures [Member] |
Real Estate Properties [Line Items] |
Number of Properties | 1
Costs incurred to date | 13,857
Expected costs to complete | 32,143
Ownership stake | 90.00%
Unconsolidated Joint Ventures [Member] |
Real Estate Properties [Line Items] |
Number of Properties | 2
Costs incurred to date | 36,874
Expected costs to complete | $ 16,843
Ownership stake | 95.00%

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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | udr_CostIncurredToDate
Namespace Prefix: | udr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | udr_ExpectedCostsToComplete
Namespace Prefix: | udr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | udr_OwnershipStake
Namespace Prefix: | udr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_RealEstatePropertiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration