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Related Party Transactions and Investments in Non-Consolidated Entities (Details 4) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Sponsored REITs |  |  |
Maximum amount of loan | $ 111,300,000 fsp_LoansAndLeasesReceivableRelatedPartiesMaximumAmountOfLoan |  |
Amount Drawn | 93,641,000 us-gaap_LoansAndLeasesReceivableRelatedParties | 99,746,000 us-gaap_LoansAndLeasesReceivableRelatedParties |
Interest income and fees from the Sponsored REIT Loans | 5,296,000 us-gaap_InterestAndFeeIncomeLoansCommercial | 5,568,000 us-gaap_InterestAndFeeIncomeLoansCommercial | 9,798,000 us-gaap_InterestAndFeeIncomeLoansCommercial
Sponsored REITs |  |  |
Sponsored REITs |  |  |
Term of sponsored REIT loan secured by mortgage, minimum | 1 year |  |
Term of sponsored REIT loan secured by mortgage, maximum | 3 years |  |
Secured revolving lines of credit | FSP Satellite Place Corp. |  |  |
Sponsored REITs |  |  |
Maximum amount of loan | 5,500,000 fsp_LoansAndLeasesReceivableRelatedPartiesMaximumAmountOfLoan / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = fsp_RevolvingLineOfCreditMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fsp_FSPSatellitePlaceCorpMember |  |
Amount Drawn | 5,500,000 us-gaap_LoansAndLeasesReceivableRelatedParties / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = fsp_RevolvingLineOfCreditMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fsp_FSPSatellitePlaceCorpMember |  |
Sponsored REIT loans, base rate | 30-day LIBOR |  |
Sponsored REIT loans, base rate margin (as a percent) | 4.40%us-gaap_LoansReceivableBasisSpreadOnVariableRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = fsp_RevolvingLineOfCreditMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fsp_FSPSatellitePlaceCorpMember |  |
Draw Fee (as a percent) | 0.50%fsp_LoansReceivableDrawFeeRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = fsp_RevolvingLineOfCreditMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fsp_FSPSatellitePlaceCorpMember |  |
Interest rate (as a percent) | 4.55%fsp_MortgageLoansOnRealEstateInterestRateAtEndOfPeriod / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = fsp_RevolvingLineOfCreditMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fsp_FSPSatellitePlaceCorpMember |  |
Secured revolving lines of credit | FSP 1441 Main Street Corp. |  |  |
Sponsored REITs |  |  |
Maximum amount of loan | 10,800,000 fsp_LoansAndLeasesReceivableRelatedPartiesMaximumAmountOfLoan / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = fsp_RevolvingLineOfCreditMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fsp_FSP1441MainStreetCorpMember |  |
Amount Drawn | 9,000,000 us-gaap_LoansAndLeasesReceivableRelatedParties / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = fsp_RevolvingLineOfCreditMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fsp_FSP1441MainStreetCorpMember |  |
Sponsored REIT loans, base rate | 30-day LIBOR |  |
Sponsored REIT loans, base rate margin (as a percent) | 4.40%us-gaap_LoansReceivableBasisSpreadOnVariableRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = fsp_RevolvingLineOfCreditMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fsp_FSP1441MainStreetCorpMember |  |
Draw Fee (as a percent) | 0.50%fsp_LoansReceivableDrawFeeRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = fsp_RevolvingLineOfCreditMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fsp_FSP1441MainStreetCorpMember |  |
Interest rate (as a percent) | 4.55%fsp_MortgageLoansOnRealEstateInterestRateAtEndOfPeriod / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = fsp_RevolvingLineOfCreditMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fsp_FSP1441MainStreetCorpMember |  |
Secured revolving lines of credit | FSP Energy Tower I Corp. |  |  |
Sponsored REITs |  |  |
Maximum amount of loan | 20,000,000 fsp_LoansAndLeasesReceivableRelatedPartiesMaximumAmountOfLoan / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = fsp_RevolvingLineOfCreditMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fsp_FSPEnergyTowerCorpMember |  |
Amount Drawn | 8,600,000 us-gaap_LoansAndLeasesReceivableRelatedParties / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = fsp_RevolvingLineOfCreditMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fsp_FSPEnergyTowerCorpMember |  |
Sponsored REIT loans, base rate | 30-day LIBOR |  |
Sponsored REIT loans, base rate margin (as a percent) | 5.00%us-gaap_LoansReceivableBasisSpreadOnVariableRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = fsp_RevolvingLineOfCreditMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fsp_FSPEnergyTowerCorpMember |  |
Draw Fee (as a percent) | 0.50%fsp_LoansReceivableDrawFeeRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = fsp_RevolvingLineOfCreditMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fsp_FSPEnergyTowerCorpMember |  |
Interest rate (as a percent) | 5.15%fsp_MortgageLoansOnRealEstateInterestRateAtEndOfPeriod / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = fsp_RevolvingLineOfCreditMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fsp_FSPEnergyTowerCorpMember |  |
Secured construction loan | FSP 385 Interlocken Development Corp. |  |  |
Sponsored REITs |  |  |
Maximum amount of loan | 42,000,000 fsp_LoansAndLeasesReceivableRelatedPartiesMaximumAmountOfLoan / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = us-gaap_ConstructionLoansMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fsp_FSP385InterlockenDevelopmentCorpMember |  |
Amount Drawn | 37,541,000 us-gaap_LoansAndLeasesReceivableRelatedParties / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = us-gaap_ConstructionLoansMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fsp_FSP385InterlockenDevelopmentCorpMember |  |
Sponsored REIT loans, base rate | 30-day LIBOR |  |
Sponsored REIT loans, base rate margin (as a percent) | 4.40%us-gaap_LoansReceivableBasisSpreadOnVariableRate / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = us-gaap_ConstructionLoansMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fsp_FSP385InterlockenDevelopmentCorpMember |  |
Interest rate (as a percent) | 4.55%fsp_MortgageLoansOnRealEstateInterestRateAtEndOfPeriod / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = us-gaap_ConstructionLoansMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fsp_FSP385InterlockenDevelopmentCorpMember |  |
Mortgage loan secured by property | FSP Energy Tower I Corp. |  |  |
Sponsored REITs |  |  |
Maximum amount of loan | 33,000,000 fsp_LoansAndLeasesReceivableRelatedPartiesMaximumAmountOfLoan / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = us-gaap_MortgagesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fsp_FSPEnergyTowerCorpMember |  |
Amount Drawn | 33,000,000 us-gaap_LoansAndLeasesReceivableRelatedParties / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = us-gaap_MortgagesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fsp_FSPEnergyTowerCorpMember |  |
Sponsored REIT loans, base rate | 30-day LIBOR |  |
Fixed rate of interest (as a percent) | 6.41%fsp_LoansReceivableFixedRatesOfInterest / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = us-gaap_MortgagesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fsp_FSPEnergyTowerCorpMember |  |
Interest rate (as a percent) | 6.41%fsp_MortgageLoansOnRealEstateInterestRateAtEndOfPeriod / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = us-gaap_MortgagesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fsp_FSPEnergyTowerCorpMember |  |
Extension available on debt | 1 year |  |
Extension fee | $ 108,900 fsp_DebtInstrumentExtensionFee / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = us-gaap_MortgagesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fsp_FSPEnergyTowerCorpMember |  |

X
- Definition Represents the extension fee paid by the borrower. + References No definition available. + Details
Name: | fsp_DebtInstrumentExtensionFee
Namespace Prefix: | fsp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the period from the maturity date of the debt for which the debt facility can be extended. + References No definition available. + Details
Name: | fsp_DebtInstrumentExtensionPeriod
Namespace Prefix: | fsp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reflects the maximum amount of loan due from related parties at the balance sheet date. + References No definition available. + Details
Name: | fsp_LoansAndLeasesReceivableRelatedPartiesMaximumAmountOfLoan
Namespace Prefix: | fsp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the percentage of draw fee of each new advance given. + References No definition available. + Details
Name: | fsp_LoansReceivableDrawFeeRate
Namespace Prefix: | fsp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the percentage of fixed rate of interest on the loans receivable. + References No definition available. + Details
Name: | fsp_LoansReceivableFixedRatesOfInterest
Namespace Prefix: | fsp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Stated maximum period for maturity of the mortgage loan receivable on real estate. + References No definition available. + Details
Name: | fsp_MortgageLoanOnRealEstateLoansMaturityPeriodMaximum
Namespace Prefix: | fsp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stated minimum period for maturity of the mortgage loan receivable on real estate. + References No definition available. + Details
Name: | fsp_MortgageLoanOnRealEstateLoansMaturityPeriodMinimum
Namespace Prefix: | fsp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The interest rate of the mortgage loan receivable at the end of the period. + References No definition available. + Details
Name: | fsp_MortgageLoansOnRealEstateInterestRateAtEndOfPeriod
Namespace Prefix: | fsp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Interest and fee income related to commercial loans including industrial and agricultural, real estate (commercial and residential, construction and development), trade financing, and lease financing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 9 + Details
Name: | us-gaap_InterestAndFeeIncomeLoansCommercial
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(e)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph e -Article 9 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin. + References No definition available. + Details
Name: | us-gaap_LoansReceivableBasisSpreadOnVariableRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The reference rate for the variable rate of the loans receivable, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
Name: | us-gaap_LoansReceivableDescriptionOfVariableRateBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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