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Significant Accounting Policies (Details 6) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
item
Dec. 31, 2013
Dec. 31, 2012
Deferred Leasing Commissions                      
Amortization of deferred leasing commissions                 $ 5,786,000us-gaap_AmortizationOfDeferredLeasingFees $ 4,683,000us-gaap_AmortizationOfDeferredLeasingFees $ 4,173,000us-gaap_AmortizationOfDeferredLeasingFees
Estimated annual amortization of deferred leasing commissions for the succeeding five years                      
2015                 5,401,000fsp_DeferredLeasingCommissionsFutureAmortizationExpenseYearOne    
2016                 4,959,000fsp_DeferredLeasingCommissionsFutureAmortizationExpenseYearTwo    
2017                 4,044,000fsp_DeferredLeasingCommissionsFutureAmortizationExpenseYearThree    
2018                 3,603,000fsp_DeferredLeasingCommissionsFutureAmortizationExpenseYearFour    
2019                 2,959,000fsp_DeferredLeasingCommissionsFutureAmortizationExpenseYearFive    
2020 and thereafter                 6,215,000fsp_DeferredLeasingCommissionsFutureAmortizationExpenseAfterYearFive    
Summary of rental revenue                      
Income from leases                 189,508,000us-gaap_OperatingLeasesIncomeStatementLeaseRevenue 159,472,000us-gaap_OperatingLeasesIncomeStatementLeaseRevenue 116,494,000us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
Reimbursable expenses                 49,731,000us-gaap_TenantReimbursements 41,486,000us-gaap_TenantReimbursements 29,847,000us-gaap_TenantReimbursements
Straight-line rent adjustment                 4,737,000fsp_DeferredRentReceivableAdjustment 5,755,000fsp_DeferredRentReceivableAdjustment 4,366,000fsp_DeferredRentReceivableAdjustment
Amortization of favorable and unfavorable leases                 (635,000)fsp_AmortizationOfFiniteLivedIdentifiableIntangibleAssetLiabilityNet 213,000fsp_AmortizationOfFiniteLivedIdentifiableIntangibleAssetLiabilityNet (273,000)fsp_AmortizationOfFiniteLivedIdentifiableIntangibleAssetLiabilityNet
Rental revenue                 243,341,000us-gaap_RealEstateRevenueNet 206,926,000us-gaap_RealEstateRevenueNet 150,434,000us-gaap_RealEstateRevenueNet
Segment Reporting                      
Number of reporting segments                 1us-gaap_NumberOfReportableSegments    
Net Income Per Share                      
Potential dilutive shares outstanding                 0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Denominator used for calculating basic and diluted net income per share (in shares) 100,187,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 100,187,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 100,187,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 100,187,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 100,187,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 100,187,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 91,847,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 82,937,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 100,187,405us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 93,855,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 82,937,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Derivative instruments                      
Fair value hedges outstanding $ 0us-gaap_FairValueHedgesAtFairValueNet               $ 0us-gaap_FairValueHedgesAtFairValueNet