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Stockholders' Equity (Details) (USD $) | 12 Months Ended | 0 Months Ended |
--- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2014 item | May 15, 2013 | May 06, 2010
Equity offerings |  |  |  |
Proceeds from the issuance of common stock, net | $ 241,500,000 us-gaap_ProceedsFromIssuanceOfCommonStock |  |  |
Offering related expenses incurred | 10,818,000 us-gaap_PaymentsOfStockIssuanceCosts |  |  |
2002 Stock Incentive Plan |  |  |  |
Equity-Based Compensation |  |  |  |
Maximum number of shares provided for grant under equity-based incentive compensation plan |  | 2,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = fsp_StockIncentivePlan2002Member |  |
Number of vesting requirements |  | 0 fsp_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfVestingRequirements / us-gaap_PlanNameAxis = fsp_StockIncentivePlan2002Member |  |
Number of shares available for grant under the plan |  | 1,944,428 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = fsp_StockIncentivePlan2002Member |  |
May 2013 Public Offering and Underwriter Overallotment Option |  |  |  |
Equity offerings |  |  |  |
Shares of common stock sold |  |  | 17,250,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_SubsidiarySaleOfStockAxis = fsp_IPOAndOverAllotmentOptionMember |
Price per share of common stock sold (in dollars per share) |  |  | $ 14.00 us-gaap_SaleOfStockPricePerShare / us-gaap_SubsidiarySaleOfStockAxis = fsp_IPOAndOverAllotmentOptionMember |
May 2013 Public Offering Underwriter Overallotment Option |  |  |  |
Equity offerings |  |  |  |
Shares of common stock sold |  |  | 2,250,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_OverAllotmentOptionMember |
May 2013 Public Offering |  |  |  |
Equity offerings |  |  |  |
Proceeds from the issuance of common stock, net |  |  | 230,700,000 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |
Offering related expenses incurred |  |  | 10,800,000 us-gaap_PaymentsOfStockIssuanceCosts / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |
ATM Sales Program |  |  |  |
Equity offerings |  |  |  |
Maximum aggregate gross sales price of common stock |  | 34,300,000 fsp_CommonStockMaximumOfferValuePerSalesProgram / us-gaap_SubsidiarySaleOfStockAxis = fsp_DemandOfferingSalesAgreementMember |  | $ 75,000,000 fsp_CommonStockMaximumOfferValuePerSalesProgram / us-gaap_SubsidiarySaleOfStockAxis = fsp_DemandOfferingSalesAgreementMember

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