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Related Party Transactions and Investments in Non-Consolidated Entities (Details 2) (USD $)
12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 22, 2006
Sep. 30, 2006
Dec. 27, 2007
Dec. 31, 2007
May 29, 2009
May 31, 2009
Sponsored REITs                  
Equity in earnings (loss) $ (1,760,000)us-gaap_IncomeLossFromEquityMethodInvestments $ (1,358,000)us-gaap_IncomeLossFromEquityMethodInvestments $ 2,033,000us-gaap_IncomeLossFromEquityMethodInvestments            
Distributions received from non-consolidated REITs                  
Distributions from non-consolidated REITs 107,000fsp_EquityMethodInvestmentDividendsOrDistributionInExcessOfEarnings 107,000fsp_EquityMethodInvestmentDividendsOrDistributionInExcessOfEarnings 2,810,000fsp_EquityMethodInvestmentDividendsOrDistributionInExcessOfEarnings            
Phoenix Tower                  
Sponsored REITs                  
Equity in earnings (loss)     1,618,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPPhoenixTowerCorpMember
           
Preferred shares purchased       48fsp_EquityMethodInvestmentPreferredStockPurchased
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPPhoenixTowerCorpMember
48fsp_EquityMethodInvestmentPreferredStockPurchased
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPPhoenixTowerCorpMember
       
Percentage of outstanding preferred shares purchased       4.60%fsp_EquityMethodInvestmentPercentageOfPreferredStockPurchased
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPPhoenixTowerCorpMember
4.60%fsp_EquityMethodInvestmentPercentageOfPreferredStockPurchased
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPPhoenixTowerCorpMember
       
Net cost of preferred shares purchased       4,116,000fsp_EquityMethodInvestmentPreferredStockPurchasedNet
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPPhoenixTowerCorpMember
4,116,000fsp_EquityMethodInvestmentPreferredStockPurchasedNet
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPPhoenixTowerCorpMember
       
Offering price of preferred shares purchased         4,800,000fsp_EquityMethodInvestmentPreferredStockPurchasedGross
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPPhoenixTowerCorpMember
       
Commissions excluded         384,000fsp_CommissionsExcluded
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPPhoenixTowerCorpMember
       
Acquisition fees excluded         300,000fsp_AcquisitionFeeExcluded
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPPhoenixTowerCorpMember
       
Distributions received from non-consolidated REITs                  
Distributions from non-consolidated REITs     173,000fsp_EquityMethodInvestmentDividendsOrDistributionInExcessOfEarnings
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPPhoenixTowerCorpMember
           
East Wacker                  
Sponsored REITs                  
Equity in earnings (loss) (1,568,000)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSP303EastWackerDriveCorpMember
(1,021,000)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSP303EastWackerDriveCorpMember
670,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSP303EastWackerDriveCorpMember
           
Preferred shares purchased           965.75fsp_EquityMethodInvestmentPreferredStockPurchased
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSP303EastWackerDriveCorpMember
965.75fsp_EquityMethodInvestmentPreferredStockPurchased
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSP303EastWackerDriveCorpMember
   
Percentage of outstanding preferred shares purchased           43.70%fsp_EquityMethodInvestmentPercentageOfPreferredStockPurchased
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSP303EastWackerDriveCorpMember
43.70%fsp_EquityMethodInvestmentPercentageOfPreferredStockPurchased
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSP303EastWackerDriveCorpMember
   
Net cost of preferred shares purchased           82,813,000fsp_EquityMethodInvestmentPreferredStockPurchasedNet
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSP303EastWackerDriveCorpMember
82,813,000fsp_EquityMethodInvestmentPreferredStockPurchasedNet
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSP303EastWackerDriveCorpMember
   
Offering price of preferred shares purchased             96,575,000fsp_EquityMethodInvestmentPreferredStockPurchasedGross
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSP303EastWackerDriveCorpMember
   
Commissions excluded             7,726,000fsp_CommissionsExcluded
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSP303EastWackerDriveCorpMember
   
Loan fees excluded             5,553,000fsp_LoanFeesExcluded
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSP303EastWackerDriveCorpMember
   
Acquisition fees excluded             483,000fsp_AcquisitionFeeExcluded
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSP303EastWackerDriveCorpMember
   
Distributions received from non-consolidated REITs                  
Distributions from non-consolidated REITs     2,489,000fsp_EquityMethodInvestmentDividendsOrDistributionInExcessOfEarnings
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSP303EastWackerDriveCorpMember
           
Grand Boulevard                  
Sponsored REITs                  
Equity in earnings (loss) (192,000)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPGrandBoulevardCorpMember
(337,000)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPGrandBoulevardCorpMember
(255,000)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPGrandBoulevardCorpMember
           
Preferred shares purchased               175.5fsp_EquityMethodInvestmentPreferredStockPurchased
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPGrandBoulevardCorpMember
175.5fsp_EquityMethodInvestmentPreferredStockPurchased
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPGrandBoulevardCorpMember
Percentage of outstanding preferred shares purchased               27.00%fsp_EquityMethodInvestmentPercentageOfPreferredStockPurchased
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPGrandBoulevardCorpMember
27.00%fsp_EquityMethodInvestmentPercentageOfPreferredStockPurchased
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPGrandBoulevardCorpMember
Net cost of preferred shares purchased               15,049,000fsp_EquityMethodInvestmentPreferredStockPurchasedNet
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPGrandBoulevardCorpMember
15,049,000fsp_EquityMethodInvestmentPreferredStockPurchasedNet
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPGrandBoulevardCorpMember
Offering price of preferred shares purchased                 17,550,000fsp_EquityMethodInvestmentPreferredStockPurchasedGross
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPGrandBoulevardCorpMember
Commissions excluded                 1,404,000fsp_CommissionsExcluded
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPGrandBoulevardCorpMember
Loan fees excluded                 1,009,000fsp_LoanFeesExcluded
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPGrandBoulevardCorpMember
Acquisition fees excluded                 88,000fsp_AcquisitionFeeExcluded
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPGrandBoulevardCorpMember
Distributions received from non-consolidated REITs                  
Distributions from non-consolidated REITs $ 107,000fsp_EquityMethodInvestmentDividendsOrDistributionInExcessOfEarnings
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPGrandBoulevardCorpMember
$ 107,000fsp_EquityMethodInvestmentDividendsOrDistributionInExcessOfEarnings
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPGrandBoulevardCorpMember
$ 148,000fsp_EquityMethodInvestmentDividendsOrDistributionInExcessOfEarnings
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPGrandBoulevardCorpMember