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Debt (Acquired Through Acquisition) (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 02, 2014
Brook 35  
Debt Instrument [Line Items]  
Principal $ 11,500us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_BusinessAcquisitionAxis
= frt_Brook35Member
Stated Interest Rate 5.46%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_BusinessAcquisitionAxis
= frt_Brook35Member
The Grove at Shrewsbury (East)  
Debt Instrument [Line Items]  
Principal 45,400us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_BusinessAcquisitionAxis
= frt_GroveatShrewsburyEastMember
Stated Interest Rate 5.82%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_BusinessAcquisitionAxis
= frt_GroveatShrewsburyEastMember
The Grove at Shrewsbury (West)  
Debt Instrument [Line Items]  
Principal $ 11,400us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_BusinessAcquisitionAxis
= frt_GroveatShrewsburyWESTMember
Stated Interest Rate 6.38%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_BusinessAcquisitionAxis
= frt_GroveatShrewsburyWESTMember