XML 38 R31.htm IDEA: XBRL DOCUMENT
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Organization (Details) | 12 Months Ended |  |
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Dec. 31, 2014 item entity property | Dec. 31, 2013 entity | Dec. 31, 2012 entity
Organization |  |  |
Number of promissory notes secured by mortgages on real estate owned by Sponsored REITs | 5 fsp_MortgageLoanOnRealEstateNumberOfWhollyOwnedSubsidiariesOfSponsoredREITsToWhomLoanIsProvided |  |
Number of REITs in which the entity holds non-controlling common stock interest | 10 fsp_NumberOfREITsInWhichEntityHoldsNoncontrollingCommonStockInterest |  |
Number of REITs in which the entity holds non-controlling preferred stock interest | 2 fsp_NumberOfREITsInWhichEntityHoldsNoncontrollingPreferredStockInterest |  |
Number of Sponsored REITs | 10 fsp_NumberOfSponsoredREITs | 14 fsp_NumberOfSponsoredREITs | 15 fsp_NumberOfSponsoredREITs
Number of properties | 38 fsp_NumberOfRealEstatePropertiesHeldForSale |  |
Mortgage loan secured by property |  |  |
Organization |  |  |
Number of promissory notes secured by mortgages on real estate owned by Sponsored REITs | 1 fsp_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 | 1 fsp_MortgageLoanOnRealEstateNumberOfWhollyOwnedSubsidiariesOfSponsoredREITsToWhomLoanIsProvided / 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 | 3 fsp_MortgageLoanOnRealEstateNumberOfSponsoredREITsToWhomLoanIsProvided / 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 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 real estate properties held for sale as of the balance sheet date. + References No definition available. + Details
Name: | fsp_NumberOfRealEstatePropertiesHeldForSale
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
Name: | fsp_NumberOfSponsoredREITs
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
- Details
Name: | dei_LegalEntityAxis=fsp_FSPHoldingsLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fsp_FSPInvestmentsLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_MortgagesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |