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Significant Accounting Policies (Details 4) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Acquired Unfavorable Real Estate Leases and Amortization |  |  |
Number of acquisitions of properties with leases |  | 3 fsp_NumberOfDirectAcquisitionsOfPropertiesWithLeases | 2 fsp_NumberOfDirectAcquisitionsOfPropertiesWithLeases
Acquired unfavorable real estate leases |  |  |
Acquired Unfavorable Real Estate Leases and Amortization |  |  |
Amortization | $ 3,229,000 us-gaap_AmortizationOfBelowMarketLease / fsp_AcquiredFiniteLivedIntangibleLiabilitiesByMajorClassAxis = fsp_LeasesAcquiredBelowMarketAdjustmentMember | $ 3,073,000 us-gaap_AmortizationOfBelowMarketLease / fsp_AcquiredFiniteLivedIntangibleLiabilitiesByMajorClassAxis = fsp_LeasesAcquiredBelowMarketAdjustmentMember | $ 1,548,000 us-gaap_AmortizationOfBelowMarketLease / fsp_AcquiredFiniteLivedIntangibleLiabilitiesByMajorClassAxis = fsp_LeasesAcquiredBelowMarketAdjustmentMember
Estimated annual amortization for succeeding five years |  |  |
2015 | 2,947,000 us-gaap_BelowMarketLeaseAmortizationIncomeNextTwelveMonths / fsp_AcquiredFiniteLivedIntangibleLiabilitiesByMajorClassAxis = fsp_LeasesAcquiredBelowMarketAdjustmentMember |  |
2016 | 2,386,000 us-gaap_BelowMarketLeaseAmortizationIncomeYearTwo / fsp_AcquiredFiniteLivedIntangibleLiabilitiesByMajorClassAxis = fsp_LeasesAcquiredBelowMarketAdjustmentMember |  |
2017 | 1,816,000 us-gaap_BelowMarketLeaseAmortizationIncomeYearThree / fsp_AcquiredFiniteLivedIntangibleLiabilitiesByMajorClassAxis = fsp_LeasesAcquiredBelowMarketAdjustmentMember |  |
2018 | 1,397,000 us-gaap_BelowMarketLeaseAmortizationIncomeYearFour / fsp_AcquiredFiniteLivedIntangibleLiabilitiesByMajorClassAxis = fsp_LeasesAcquiredBelowMarketAdjustmentMember |  |
2019 | 854,000 us-gaap_BelowMarketLeaseAmortizationIncomeYearFive / fsp_AcquiredFiniteLivedIntangibleLiabilitiesByMajorClassAxis = fsp_LeasesAcquiredBelowMarketAdjustmentMember |  |
2020 and thereafter | $ 1,507,000 us-gaap_BelowMarketLeaseAmortizationIncomeAfterYearFive / fsp_AcquiredFiniteLivedIntangibleLiabilitiesByMajorClassAxis = fsp_LeasesAcquiredBelowMarketAdjustmentMember |  |
Acquired unfavorable real estate leases | Minimum |  |  |
Acquired Unfavorable Real Estate Leases and Amortization |  |  |
Term of lease | 10 months |  |
Acquired unfavorable real estate leases | Maximum |  |  |
Acquired Unfavorable Real Estate Leases and Amortization |  |  |
Term of lease | 281 months |  |

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- Definition Amount of amortization income for leases with a finite life acquired as part of a real property acquisition at below market lease rate expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization income for leases with a finite life acquired as part of a real property acquisition at below market lease rate expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization income for leases with a finite life acquired as part of a real property acquisition at below market lease rate expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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