Gain resulting from the deconsolidation of a variable interest entity

Name:	frt_DiscontinuedOperationGainOnDeconsolidationOfVariableInterestEntity
Namespace Prefix:	frt
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Extension Option Period

+ Details

Name:	frt_ExtensionOptionPeriod
Namespace Prefix:	frt
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

- Definition

he carrying amount of the oustanding balance due under the mortgage loan prior to refinancing.

+ Details

Name:	frt_MortgageLoanCarryingBalance
Namespace Prefix:	frt
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The original fair value of the mortgage loan receivable.

+ Details

Name:	frt_MortgageLoanFairValue
Namespace Prefix:	frt
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of cash received at refinancing of a mortgage note receivable related to a previously consolidated VIE.

+ Details

Name:	frt_MortgageLoanOnRealEstateRefinancingPayment
Namespace Prefix:	frt
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The stated maturity date of the mortgage loan receivable on real estate or a range of maturity dates for a group of loans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-29)

-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule IV

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 29

-Article 12

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule IV)

-URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674

+ Details

Name:	us-gaap_MortgageLoanOnRealEstateFinalMaturityDate
Namespace Prefix:	us-gaap
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The carrying amount of the outstanding balance due under the mortgage loan.

+ References

+ Details

Name:	us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of the contractual principal due at the origination of the mortgage loan (face amount).

+ References

+ Details

Name:	us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

+ References

+ Details

Name:	us-gaap_MortgageLoansOnRealEstateInterestRate
Namespace Prefix:	us-gaap
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Mortgage Notes Receivable (Details) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended
Mortgage Notes Receivable (Details) (USD $)	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 Mortgage loan on a shopping center and an adjacent commercial building in Norwalk ,CT [Member]	Jun. 30, 2011 Mortgage loan on a shopping center and an adjacent commercial building in Norwalk ,CT [Member]	Jun. 29, 2011 Mortgage loan on a shopping center and an adjacent commercial building in Norwalk ,CT [Member]
Mortgage loan carrying balance							$ 18,300,000
Principal balance of first mortgage loan						11,900,000
Interest rate of first mortgage loan					6.00%
Maturity date of first mortgage loan					Jun. 30, 2014
Extension Option Period					1 year
Cash received as part of refinancing					8,700,000
Mortgage Loan Fair Value						11,900,000
Discontinued operations - gain on deconsolidation of VIE			2,026,000
Mortgage Loans on Real Estate, Carrying Amount of Mortgages					$ 11,700,000