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Organization, Properties, Basis of Presentation, Financial Instruments and Recent Accounting Standards (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015 property item entity sqft	Dec. 31, 2014 entity	Mar. 31, 2014 property sqft entity
Organization
Number of promissory notes secured by mortgages on real estate owned by Sponsored REITs	5fsp_NumberOfPromissoryNotesSecuredByMortgagesOnRealEstateOwnedBySponsoredREITs
Number of REITs in which the entity holds non-controlling common stock interest	9fsp_NumberOfREITsInWhichEntityHoldsNoncontrollingCommonStockInterest
Number of REITs in which the entity holds non-controlling preferred stock interest	2fsp_NumberOfREITsInWhichEntityHoldsNoncontrollingPreferredStockInterest
Number of Sponsored REITs	9fsp_NumberOfSponsoredREITs	10fsp_NumberOfSponsoredREITs	14fsp_NumberOfSponsoredREITs
Properties
Number of properties	36us-gaap_NumberOfRealEstateProperties		39us-gaap_NumberOfRealEstateProperties
Rentable square feet	9,310,131us-gaap_AreaOfRealEstateProperty		9,686,055us-gaap_AreaOfRealEstateProperty
Recent Accounting Standards
Reclassification of debt issuance costs from assets to contra liabilities	$ 7.1fsp_ReclassificationOfDebtIssuanceCostsFromAssetsToContraLiabilities	$ 7.6fsp_ReclassificationOfDebtIssuanceCostsFromAssetsToContraLiabilities
Mortgage loan secured by property
Organization
Number of promissory notes secured by mortgages on real estate owned by Sponsored REITs	1fsp_NumberOfPromissoryNotesSecuredByMortgagesOnRealEstateOwnedBySponsoredREITs / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
Secured construction loan
Organization
Number of promissory notes secured by mortgages on real estate owned by Sponsored REITs	1fsp_NumberOfPromissoryNotesSecuredByMortgagesOnRealEstateOwnedBySponsoredREITs / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember
Secured revolving lines of credit
Organization
Number of promissory notes secured by mortgages on real estate owned by Sponsored REITs	3fsp_NumberOfPromissoryNotesSecuredByMortgagesOnRealEstateOwnedBySponsoredREITs / us-gaap_LongtermDebtTypeAxis = fsp_RevolvingLineOfCreditMember
FSP Investments LLC
Organization
Ownership interest (as a percent)	100.00%fsp_OwnershipInterestPercentageOfParentInConsolidatedEntities / dei_LegalEntityAxis = fsp_FSPInvestmentsLLCMember
FSP Property Management LLC
Organization
Ownership interest (as a percent)	100.00%fsp_OwnershipInterestPercentageOfParentInConsolidatedEntities / dei_LegalEntityAxis = fsp_FSPPropertyManagementLLCMember
FSP Holdings LLC
Organization
Ownership interest (as a percent)	100.00%fsp_OwnershipInterestPercentageOfParentInConsolidatedEntities / dei_LegalEntityAxis = fsp_FSPHoldingsLLCMember
FSP Protective TRS Corp.
Organization
Ownership interest (as a percent)	100.00%fsp_OwnershipInterestPercentageOfParentInConsolidatedEntities / dei_LegalEntityAxis = fsp_FSPProtectiveTRSCorpMember

X

- Definition

Represents the number of promissory notes secured by mortgages on real estate owned by Sponsored REITs.

+ References

No definition available.

+ Details

Name:	fsp_NumberOfPromissoryNotesSecuredByMortgagesOnRealEstateOwnedBySponsoredREITs
Namespace Prefix:	fsp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the number of entities in which the reporting entity has a non-controlling common stock interest.

+ References

No definition available.

+ Details

Name:	fsp_NumberOfREITsInWhichEntityHoldsNoncontrollingCommonStockInterest
Namespace Prefix:	fsp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the number of entities in which the reporting entity has a non-controlling preferred stock interest.

+ References

No definition available.

+ Details

Name:	fsp_NumberOfREITsInWhichEntityHoldsNoncontrollingPreferredStockInterest
Namespace Prefix:	fsp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of sponsored real estate investment trusts in which the entity has an interest.

+ References

No definition available.

+ Details

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Namespace Prefix:	fsp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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- Details

Name:	fsp_OrganizationAndConsolidationLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the ownership interest percentage of the parent in consolidated entities.

+ References

No definition available.

+ Details

Name:	fsp_OwnershipInterestPercentageOfParentInConsolidatedEntities
Namespace Prefix:	fsp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	fsp_RecentAccountingStandardsAbstract
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the reclassification of debt issuance costs from assets to contra liabilities on the condensed consolidated balance sheets as a result of a recently issued ASU.

+ References

No definition available.

+ Details

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Namespace Prefix:	fsp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfRealEstateProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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- Details

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- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

Name:	dei_LegalEntityAxis=fsp_FSPInvestmentsLLCMember
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X

- Details

Name:	dei_LegalEntityAxis=fsp_FSPPropertyManagementLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=fsp_FSPProtectiveTRSCorpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=fsp_RevolvingLineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_ConstructionLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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