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Dispositions and Discontinued Operations (Details) (USD $)	12 Months Ended			0 Months Ended		3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 29, 2013	Dec. 21, 2012	Sep. 30, 2012
Operating results for the asset held for sale
Rental revenue	$ 243,341,000us-gaap_RealEstateRevenueNet	$ 206,926,000us-gaap_RealEstateRevenueNet	$ 150,434,000us-gaap_RealEstateRevenueNet
Rental operating expenses	(62,032,000)us-gaap_CostOfRealEstateRevenue	(51,100,000)us-gaap_CostOfRealEstateRevenue	(37,440,000)us-gaap_CostOfRealEstateRevenue
Real estate taxes and insurance	(36,857,000)us-gaap_RealEstateTaxesAndInsurance	(31,616,000)us-gaap_RealEstateTaxesAndInsurance	(22,904,000)us-gaap_RealEstateTaxesAndInsurance
Depreciation and amortization	(95,915,000)us-gaap_DepreciationAndAmortization	(78,839,000)us-gaap_DepreciationAndAmortization	(54,051,000)us-gaap_DepreciationAndAmortization
Net income (loss) from discontinued operations		375,000us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	(491,000)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
Discontinued operations
Operating results for the asset held for sale
Rental revenue		991,000us-gaap_RealEstateRevenueNet / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember	2,334,000us-gaap_RealEstateRevenueNet / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Rental operating expenses			(1,089,000)us-gaap_CostOfRealEstateRevenue / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Real estate taxes and insurance			(340,000)us-gaap_RealEstateTaxesAndInsurance / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Depreciation and amortization		(616,000)us-gaap_DepreciationAndAmortization / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember	(1,396,000)us-gaap_DepreciationAndAmortization / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Net income (loss) from discontinued operations		375,000us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember	(491,000)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Discontinued operations | Commercial property in Richardson, Texas
Discontinued operations
Gain (Loss) on sale of properties				2,200,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = fsp_OfficePropertyInRichardsonTexasMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Discontinued operations | Commercial property in Southfield, Michigan
Discontinued operations
Gain (Loss) on sale of properties					(14,800,000)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = fsp_OfficePropertyInSouthfieldMichiganMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Expected term for sale of property						1 year
Provision for loss on a property held for sale net of applicable income tax						14,300,000us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = fsp_OfficePropertyInSouthfieldMichiganMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Sale price of properties sold					300,000fsp_RealEstateAggregateSalesPriceOfRealEstateSold / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = fsp_OfficePropertyInSouthfieldMichiganMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Assets held for sale
Assets held for sale						$ 700,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = fsp_OfficePropertyInSouthfieldMichiganMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember

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Amount classified as assets attributable to disposal group held for sale or disposed of.

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After tax income (loss) from operations of a business component (exclusive of any gain (loss) on disposal, or provision therefore) during the reporting period, until its disposal.

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Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value.

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The aggregate revenue from real estate operations during the reporting period.

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