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Federal Income Tax Reporting (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Federal Income Tax Reporting
Maximum ownership as a percentage of the voting power or value of the securities of each issuer other than REIT or "TRS"	10.00%fsp_MaximumOwnershipPercentageInEachIssuerOtherThanREITOrTRSToMaintainREITStatus
Maximum ownership of securities in all TRS (as a percent)	25.00%fsp_MaximumOwnershipInAllTaxableREITSubsidiariesAsPercentageOfAssetsOfEntityToMaintainREITStatus
Maximum ownership of securities in all TRS when considered together with other non-real estate assets (as a percent)	25.00%fsp_MaximumOwnershipInAllTaxableREITSubsidiariesAsPercentageOfAssetsOfEntityToMaintainREITStatusIncludingOtherNonRealEstateAssets
Period of statute of limitations applicable to the entity's income tax returns	3 years
Net operating losses
NOLs expiration period	20 years
Gross amount of NOLs available to company	$ 13,041,000us-gaap_OperatingLossCarryforwards	$ 13,041,000us-gaap_OperatingLossCarryforwards	$ 13,041,000us-gaap_OperatingLossCarryforwards
Increase (decrease) in taxes resulting from:
Revised Texas franchise tax	474,000fsp_IncomeTaxReconciliationRevisedTexasFranchiseTax	462,000fsp_IncomeTaxReconciliationRevisedTexasFranchiseTax	330,000fsp_IncomeTaxReconciliationRevisedTexasFranchiseTax
Other Taxes	24,000us-gaap_IncomeTaxReconciliationOtherReconcilingItems	18,000us-gaap_IncomeTaxReconciliationOtherReconcilingItems	5,000us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Income tax expense	498,000us-gaap_IncomeTaxExpenseBenefit	480,000us-gaap_IncomeTaxExpenseBenefit	335,000us-gaap_IncomeTaxExpenseBenefit
Deferred income taxes	0us-gaap_DeferredIncomeTaxExpenseBenefit
Revised Texas Franchise tax rate (as a percent)	0.70%fsp_EffectiveRevisedTexasFranchiseTaxRate
Real estate assets net tax basis more (less) than book basis	$ 163,925,000fsp_RealEstateAssetsDifferencesBetweenBookAndTaxBasis	$ 160,599,000fsp_RealEstateAssetsDifferencesBetweenBookAndTaxBasis

X

- Definition

Represents the Revised Texas Franchise Tax rate as a percentage of revenues at Texas properties commencing with 2007 revenues.

+ References

No definition available.

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The portion of the difference between total income tax expense or benefit as reported in the income statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to the Revised Texas Franchise Tax.

+ References

No definition available.

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- Definition

Represents the maximum ownership in all Taxable REIT Subsidiaries that can be held by the entity as a percentage of its assets value to maintain its REIT status.

+ References

No definition available.

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Represents the maximum ownership in all Taxable REIT Subsidiaries that can be held by the entity as a percentage of its assets value when considered together with other non-real estate assets to maintain its REIT status.

+ References

No definition available.

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- Definition

Represents the maximum ownership that the entity can hold as a percentage of the voting power or value of the securities of each issuer which is not a REIT or Taxable REIT Subsidiary.

+ References

No definition available.

+ Details

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Represents the period after which the net operating losses expire.

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- Definition

Represents the period of statute of limitations for the entity's income tax returns, that remain subject to examination.

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- Definition

Represents the excess of tax basis over book basis of real estate assets.

+ References

No definition available.

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- Definition

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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