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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 |
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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) |  |  |  |  |  |  |  | 10 fsp_NumberOfREITsInWhichEntityHoldsNoncontrollingCommonStockInterest
Number of REITs in which the entity holds non-controlling preferred stock interest |  |  |  |  |  |  |  | 2 fsp_NumberOfREITsInWhichEntityHoldsNoncontrollingPreferredStockInterest
Required investment balance for recognition of distributions received as income |  |  |  |  |  |  |  | $ 0 fsp_EquityMethodInvestmentRequiredBalanceForRecognitionOfDistributionsReceivedAsIncome
Phoenix Tower |  |  |  |  |  |  |  |
Sponsored REITs |  |  |  |  |  |  |  |
Preferred shares purchased |  | 48 fsp_EquityMethodInvestmentPreferredStockPurchased / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPPhoenixTowerCorpMember | 48 fsp_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 |  | 4,116,000 fsp_EquityMethodInvestmentPreferredStockPurchasedNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPPhoenixTowerCorpMember | 4,116,000 fsp_EquityMethodInvestmentPreferredStockPurchasedNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPPhoenixTowerCorpMember |  |  |  |  |
Gain on sale, less applicable income tax | 1,600,000 us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPPhoenixTowerCorpMember |  |  |  |  |  |  |
East Wacker |  |  |  |  |  |  |  |
Sponsored REITs |  |  |  |  |  |  |  |
Preferred shares purchased |  |  |  | 965.75 fsp_EquityMethodInvestmentPreferredStockPurchased / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSP303EastWackerDriveCorpMember | 965.75 fsp_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 |  |  |  | 82,813,000 fsp_EquityMethodInvestmentPreferredStockPurchasedNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSP303EastWackerDriveCorpMember | 82,813,000 fsp_EquityMethodInvestmentPreferredStockPurchasedNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSP303EastWackerDriveCorpMember |  |  |
Grand Boulevard |  |  |  |  |  |  |  |
Sponsored REITs |  |  |  |  |  |  |  |
Preferred shares purchased |  |  |  |  |  | 175.5 fsp_EquityMethodInvestmentPreferredStockPurchased / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPGrandBoulevardCorpMember | 175.5 fsp_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 |  |  |  |  |  | $ 15,049,000 fsp_EquityMethodInvestmentPreferredStockPurchasedNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPGrandBoulevardCorpMember | $ 15,049,000 fsp_EquityMethodInvestmentPreferredStockPurchasedNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPGrandBoulevardCorpMember |

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