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Schedule IV - Mortgage Loans on Real Estate (Details) (USD $)
 12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Aug. 04, 2006
Mortgage Loans on Real Estate [Line Items]        
Prior Liens $ 34,000,000us-gaap_MortgageLoansOnRealEstatePriorLiens1      
Face Amount of Mortgages 51,942,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages      
Carrying Amount of Mortgages 50,988,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages [1] 55,200,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages    
Principal Amount of Loans Subject to delinquent Principal or Interest 0us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans      
Mortgage Loans on Real Estate, Other Required Disclosures [Abstract]        
Aggregate tax basis for Federal tax purposes 51,900,000us-gaap_MortgageLoansOnRealEstateFederalIncomeTaxBasis1      
Interest rate 9.00%us-gaap_MortgageLoansOnRealEstateInterestRate 9.00%us-gaap_MortgageLoansOnRealEstateInterestRate    
Movement in Mortgage Loans on Real Estate [Roll Forward]        
Balance at beginning of year 55,155,000us-gaap_MortgageLoansOnRealEstate 55,648,000us-gaap_MortgageLoansOnRealEstate 55,967,000us-gaap_MortgageLoansOnRealEstate  
Issuance of loans     70,000us-gaap_MortgageLoansOnRealEstateNewMortgageLoans  
Collection and satisfaction of loans (4,778,000)us-gaap_MortgageLoansOnRealEstateCollectionsOfPrincipal (1,057,000)us-gaap_MortgageLoansOnRealEstateCollectionsOfPrincipal (1,161,000)us-gaap_MortgageLoansOnRealEstateCollectionsOfPrincipal  
Amortization of discount 611,000us-gaap_MortgageLoansOnRealEstateAmortizationOfPremium 564,000us-gaap_MortgageLoansOnRealEstateAmortizationOfPremium 772,000us-gaap_MortgageLoansOnRealEstateAmortizationOfPremium  
Balance at end of year 50,988,000us-gaap_MortgageLoansOnRealEstate 55,155,000us-gaap_MortgageLoansOnRealEstate 55,648,000us-gaap_MortgageLoansOnRealEstate  
Mortgage On Retail Buildings in Philadelphia, PA, Loan One        
Mortgage Loans on Real Estate [Line Items]        
Prior Liens 0us-gaap_MortgageLoansOnRealEstatePriorLiens1
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frt_MortgageOnRetailBuildingsInPhiladelphiaPaLoanOneMember		      
Face Amount of Mortgages 20,286,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frt_MortgageOnRetailBuildingsInPhiladelphiaPaLoanOneMember		      
Carrying Amount of Mortgages 20,286,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frt_MortgageOnRetailBuildingsInPhiladelphiaPaLoanOneMember		 [2]      
Principal Amount of Loans Subject to delinquent Principal or Interest 0us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frt_MortgageOnRetailBuildingsInPhiladelphiaPaLoanOneMember		      
Mortgage On Retail Buildings in Philadelphia, PA, Loan One | Interest Rate One        
Mortgage Loans on Real Estate [Line Items]        
Interest Rate 8.00%frt_MortgageLoansOnRealEstateParticipationPlusInterestRateInterestRate
/ frt_InterestRateAxis
= frt_InterestRateOneMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frt_MortgageOnRetailBuildingsInPhiladelphiaPaLoanOneMember		      
Mortgage On Retail Buildings in Philadelphia, PA, Loan One | Interest Rate Two        
Mortgage Loans on Real Estate [Line Items]        
Interest Rate 10.00%frt_MortgageLoansOnRealEstateParticipationPlusInterestRateInterestRate
/ frt_InterestRateAxis
= frt_InterestRateTwoMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frt_MortgageOnRetailBuildingsInPhiladelphiaPaLoanOneMember		      
Mortgage On Retail Buildings in Philadelphia, PA, Loan One | Maximum        
Mortgage Loans on Real Estate [Line Items]        
Face Amount of Mortgages 25,000,000.0us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frt_MortgageOnRetailBuildingsInPhiladelphiaPaLoanOneMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
Mortgage On Retail Buildings in Philadelphia, PA, Loan Two        
Mortgage Loans on Real Estate [Line Items]        
Prior Liens 0us-gaap_MortgageLoansOnRealEstatePriorLiens1
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frt_MortgageOnRetailBuildingsInPhiladelphiaPaLoanTwoMember		      
Face Amount of Mortgages 9,250,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frt_MortgageOnRetailBuildingsInPhiladelphiaPaLoanTwoMember		      
Carrying Amount of Mortgages 9,250,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frt_MortgageOnRetailBuildingsInPhiladelphiaPaLoanTwoMember		      
Principal Amount of Loans Subject to delinquent Principal or Interest 0us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frt_MortgageOnRetailBuildingsInPhiladelphiaPaLoanTwoMember		      
Interest Rate 10.00%frt_MortgageLoansOnRealEstateParticipationPlusInterestRateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frt_MortgageOnRetailBuildingsInPhiladelphiaPaLoanTwoMember		      
Second Mortgage On Hotel In San Jose, CA        
Mortgage Loans on Real Estate [Line Items]        
Prior Liens 34,000,000us-gaap_MortgageLoansOnRealEstatePriorLiens1
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frt_SecondMortgageOnHotelInSanJoseCaMember		 [3],[4]      
Face Amount of Mortgages 10,691,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frt_SecondMortgageOnHotelInSanJoseCaMember		 11,900,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frt_SecondMortgageOnHotelInSanJoseCaMember		    
Carrying Amount of Mortgages 9,737,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frt_SecondMortgageOnHotelInSanJoseCaMember		 [3]      
Principal Amount of Loans Subject to delinquent Principal or Interest 0us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frt_SecondMortgageOnHotelInSanJoseCaMember		 [3]      
Mortgage Loans on Real Estate, Other Required Disclosures [Abstract]        
Interest rate 9.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frt_SecondMortgageOnHotelInSanJoseCaMember		     14.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frt_SecondMortgageOnHotelInSanJoseCaMember
Amortization schedule, period       15 years
Mortgage loan on a shopping center and an adjacent commercial building in Norwalk ,CT        
Mortgage Loans on Real Estate [Line Items]        
Prior Liens 0us-gaap_MortgageLoansOnRealEstatePriorLiens1
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frt_MortgageLoanOnShoppingCenterAndAdjacentCommercialBuildingInNorwalkCtMember		      
Face Amount of Mortgages 11,715,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frt_MortgageLoanOnShoppingCenterAndAdjacentCommercialBuildingInNorwalkCtMember		      
Carrying Amount of Mortgages 11,715,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frt_MortgageLoanOnShoppingCenterAndAdjacentCommercialBuildingInNorwalkCtMember		      
Principal Amount of Loans Subject to delinquent Principal or Interest $ 0us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frt_MortgageLoanOnShoppingCenterAndAdjacentCommercialBuildingInNorwalkCtMember		      
Mortgage Loans on Real Estate, Other Required Disclosures [Abstract]        
Interest rate 7.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= frt_MortgageLoanOnShoppingCenterAndAdjacentCommercialBuildingInNorwalkCtMember		      
[1] For Federal tax purposes, the aggregate tax basis is approximately $51.9 million as of December 31, 2014.
[2] This mortgage is available for up to $25.0 million.
[3] This note was amended on August 4, 2006. The amended note decreased the interest from 14% to 9% per annum, and requires monthly payments of principal and interest based on 15-year amortization schedule.
[4] We do not hold the first mortgage loan on this property. Accordingly, the amount of the prior lien at December 31, 2014 is estimated.