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Real Estate Partnerships (Narrative) (Details)
Sep. 30, 2013
Schedule of Equity Method Investments [Line Items]  
Number of Real Estate Properties 87
Federal / Lion Venture LP [Member]
 
Schedule of Equity Method Investments [Line Items]  
Number of Real Estate Properties 7
Federal Realty Investment Trust [Member] | Federal / Lion Venture LP [Member]
 
Schedule of Equity Method Investments [Line Items]  
Ownership interest in partnership 30.00%
Clarion [Member] | Federal / Lion Venture LP [Member]
 
Schedule of Equity Method Investments [Line Items]  
Ownership interest in partnership 70.00%