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Organization (Details) | 12 Months Ended
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Dec. 31, 2012 note entity property
Organization |
Number of promissory notes secured by mortgages on real estate owned by Sponsored REITs | 7
Number of corporations organized to operate as real estate investment trusts (REITs) | 15
Number of REITs in which the entity holds non-controlling preferred stock interest | 2
Commercial real estate: |
Number of properties | 37
Mortgage loan |
Organization |
Number of promissory notes secured by mortgages on real estate owned by Sponsored REITs | 1
Revolving lines of credit |
Organization |
Number of promissory notes secured by mortgages on real estate owned by Sponsored REITs | 5
Secured construction loan |
Organization |
Number of promissory notes secured by mortgages on real estate owned by Sponsored REITs | 1
FSP Investments LLC |
Organization |
Ownership interest (as a percent) | 100.00%
FSP Property Management LLC |
Organization |
Ownership interest (as a percent) | 100.00%
FSP Holdings LLC |
Organization |
Ownership interest (as a percent) | 100.00%
FSP Protective TRS Corp. |
Organization |
Ownership interest (as a percent) | 100.00%

X
- Definition Represents the number of sponsored REITs of the entity to which loans have been provided. + References No definition available. + Details
Name: | fsp_MortgageLoanOnRealEstateNumberOfSponsoredREITsToWhomLoanIsProvided
Namespace Prefix: | fsp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of wholly-owned subsidiaries of the sponsored REITs of the entity to whom loan has been provided. + References No definition available. + Details
Name: | fsp_MortgageLoanOnRealEstateNumberOfWhollyOwnedSubsidiariesOfSponsoredREITsToWhomLoanIsProvided
Namespace Prefix: | fsp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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
- Details
Name: | fsp_OrganizationAndConsolidationLineItems
Namespace Prefix: | fsp_
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
- 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

X
- Details
Name: | us-gaap_RealEstateInvestmentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration