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Related Party Transactions and Investments in Non-Consolidated Entities (Details 2) (USD $)
3 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2007
May 31, 2009
Sponsored REITs        
Equity in loss $ 322,000us-gaap_IncomeLossFromEquityMethodInvestments $ 484,000us-gaap_IncomeLossFromEquityMethodInvestments    
Distributions received from non-consolidated REITs        
Distributions from non-consolidated REITs 27,000fsp_EquityMethodInvestmentDividendsOrDistributionInExcessOfEarnings 27,000fsp_EquityMethodInvestmentDividendsOrDistributionInExcessOfEarnings    
East Wacker        
Sponsored REITs        
Equity in loss 285,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSP303EastWackerDriveCorpMember
431,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSP303EastWackerDriveCorpMember
   
Preferred shares purchased     965.75fsp_EquityMethodInvestmentPreferredStockPurchased
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSP303EastWackerDriveCorpMember
 
Percentage of outstanding preferred shares purchased     43.70%fsp_EquityMethodInvestmentPercentageOfPreferredStockPurchased
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSP303EastWackerDriveCorpMember
 
Net cost of preferred shares purchased     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
 
Grand Boulevard        
Sponsored REITs        
Equity in loss 37,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPGrandBoulevardCorpMember
53,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPGrandBoulevardCorpMember
   
Preferred shares purchased       175.5fsp_EquityMethodInvestmentPreferredStockPurchased
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPGrandBoulevardCorpMember
Percentage of outstanding preferred shares purchased       27.00%fsp_EquityMethodInvestmentPercentageOfPreferredStockPurchased
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fsp_FSPGrandBoulevardCorpMember
Net cost of preferred shares purchased       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