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Subsequent Event (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 09, 2015
Subsequent Event [Line Items]        
Mortgage loans assumed with acquisition $ 68,282,000us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 $ 0us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 $ 67,615,000us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1  
San Antonio Center        
Subsequent Event [Line Items]        
Acquisition costs 700,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= frt_SanAntonioCenterMember
     
San Antonio Center | Subsequent Event        
Subsequent Event [Line Items]        
Leasable area (square feet)       376,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_BusinessAcquisitionAxis
= frt_SanAntonioCenterMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Gross value       62,200,000frt_BusinessAcquisitionGrossValue
/ us-gaap_BusinessAcquisitionAxis
= frt_SanAntonioCenterMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Effective interest percentage       80.00%frt_EffectiveInterestAcquisition
/ us-gaap_BusinessAcquisitionAxis
= frt_SanAntonioCenterMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Mortgage loans assumed with acquisition       18,700,000us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1
/ us-gaap_BusinessAcquisitionAxis
= frt_SanAntonioCenterMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Interest rate       5.27%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_BusinessAcquisitionAxis
= frt_SanAntonioCenterMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Number of downREIT operating partnership units       58,000frt_NumberofDownREITUnitsIssuedinConnectionwithBusinessAcquisition
/ us-gaap_BusinessAcquisitionAxis
= frt_SanAntonioCenterMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Cash payments to acquire businesses       $ 27,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= frt_SanAntonioCenterMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember