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

X

- 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