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Related Party Transactions and Investments in Non-Consolidated Entities (Details 3) (USD $)
 12 Months Ended
Dec. 31, 2014
entity
Dec. 31, 2013
entity
Dec. 31, 2012
entity
Related Party Transactions and Investments in Non-Consolidated Entities      
Sponsored REITs (in entities) 10fsp_NumberOfSponsoredREITs 14fsp_NumberOfSponsoredREITs 15fsp_NumberOfSponsoredREITs
Balance Sheet Data (unaudited):      
Real Estate, net $ 451,822,000fsp_EquityMethodInvestmentSummarizedFinancialInformationRealEstateNet $ 642,105,000fsp_EquityMethodInvestmentSummarizedFinancialInformationRealEstateNet  
Other assets 127,259,000fsp_EquityMethodInvestmentSummarizedFinancialInformationOtherAssets 187,494,000fsp_EquityMethodInvestmentSummarizedFinancialInformationOtherAssets  
Total liabilities (203,239,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities (321,099,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities  
Total stockholders' equity 375,842,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity 508,500,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity  
Operating Data (unaudited):      
Rental revenues 66,457,000fsp_EquityMethodInvestmentSummarizedFinancialInformationRentalRevenue 93,608,000fsp_EquityMethodInvestmentSummarizedFinancialInformationRentalRevenue 109,676,000fsp_EquityMethodInvestmentSummarizedFinancialInformationRentalRevenue
Other revenues 43,000fsp_EquityMethodInvestmentSummarizedFinancialInformationOtherRevenue 68,000fsp_EquityMethodInvestmentSummarizedFinancialInformationOtherRevenue 115,000fsp_EquityMethodInvestmentSummarizedFinancialInformationOtherRevenue
Operating and maintenance expenses (34,318,000)fsp_EquityMethodInvestmentSummarizedFinancialInformationOperatingAndMaintenanceExpense (48,718,000)fsp_EquityMethodInvestmentSummarizedFinancialInformationOperatingAndMaintenanceExpense (56,621,000)fsp_EquityMethodInvestmentSummarizedFinancialInformationOperatingAndMaintenanceExpense
Depreciation and amortization (23,417,000)fsp_EquityMethodInvestmentSummarizedFinancialInformationDepreciationAndAmortization (31,450,000)fsp_EquityMethodInvestmentSummarizedFinancialInformationDepreciationAndAmortization (35,143,000)fsp_EquityMethodInvestmentSummarizedFinancialInformationDepreciationAndAmortization
Interest expense (9,627,000)fsp_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense (13,752,000)fsp_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense (17,357,000)fsp_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense
Gain on sale, less applicable income tax   5,851,000fsp_EquityMethodInvestmentSummarizedFinancialInformationGainLossOnSale 36,610,000fsp_EquityMethodInvestmentSummarizedFinancialInformationGainLossOnSale
Net income (loss) (862,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss 5,607,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss 37,280,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
Asset management fees, low end of range (as a percent) 1.00%fsp_AssetManagementFeesPercentageLowEndOfRange    
Asset management fees, high end of range (as a percent) 5.00%fsp_AssetManagementFeesPercentageHighEndOfRange    
Notice period for cancellation of applicable contracts 30 days    
Asset management fee income from non-consolidated entities $ 945,000us-gaap_AssetManagementFees1 $ 1,078,000us-gaap_AssetManagementFees1 $ 1,149,000us-gaap_AssetManagementFees1