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Summary Of Significant Accounting Changes (Narrative) (Details) | Jun. 30, 2012
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Minority Interest In Joint Ventures Percentage | 20.00%
Number of properties | 67
RioCan Real Estate Investment Trust [Member] |
Number of properties | 22

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- Definition Minority Interest In Joint Ventures Percentage + References No definition available. + Details
Name: | cdr_MinorityInterestInJointVenturesPercentage
Namespace Prefix: | cdr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- 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