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Significant Accounting Policies (Details) (USD $)	0 Months Ended		1 Months Ended	0 Months Ended	1 Months Ended	0 Months Ended	1 Months Ended
	Dec. 20, 2012	Sep. 22, 2006	Sep. 30, 2006	Dec. 27, 2007	Dec. 31, 2007	May 29, 2009	May 31, 2009	Dec. 31, 2014 entity
Significant Accounting Policies
Number of corporations organized to operate as real estate investment trusts (REITs)								10fsp_NumberOfREITsInWhichEntityHoldsNoncontrollingCommonStockInterest
Number of REITs in which the entity holds non-controlling preferred stock interest								2fsp_NumberOfREITsInWhichEntityHoldsNoncontrollingPreferredStockInterest
Required investment balance for recognition of distributions received as income								$ 0fsp_EquityMethodInvestmentRequiredBalanceForRecognitionOfDistributionsReceivedAsIncome
Phoenix Tower
Sponsored REITs
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
Gain on sale, less applicable income tax	1,600,000us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPPhoenixTowerCorpMember
East Wacker
Sponsored REITs
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
Grand Boulevard
Sponsored REITs
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

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- Definition

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