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Significant Accounting Policies (Details 5) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Discontinued Operations |  |  |
Time period within which sale or disposition of properties held for sale is probable | 1 year |  |
Tenant Rent Receivables and Straight-line Rent Receivable |  |  |
Period within which tenant rent receivables are expected to be collected | 1 year |  |
Straight-line rent receivable | $ 47,021,000 fsp_DeferredRentReceivableNetIncludingAmountsForAssetsHeldForSale | $ 42,261,000 fsp_DeferredRentReceivableNetIncludingAmountsForAssetsHeldForSale |
Allowance for doubtful accounts - Tenant rent receivables |  |  |
Allowance for doubtful accounts activity |  |  |
Receivables written-off | 119,000 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = fsp_AllowanceForTenantRentReceivablesMember | 1,237,000 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = fsp_AllowanceForTenantRentReceivablesMember | 20,000 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = fsp_AllowanceForTenantRentReceivablesMember
Increase (decrease) in allowance | 394,000 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = fsp_AllowanceForTenantRentReceivablesMember | (13,000)us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = fsp_AllowanceForTenantRentReceivablesMember | 85,000 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = fsp_AllowanceForTenantRentReceivablesMember
Allowance for doubtful accounts - Straight-line rent receivable |  |  |
Allowance for doubtful accounts activity |  |  |
Receivables written-off |  | 48,000 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = fsp_AllowanceForStraightLineRentReceivableMember | 28,000 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = fsp_AllowanceForStraightLineRentReceivableMember
Increase (decrease) in allowance | $ 27,000 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = fsp_AllowanceForStraightLineRentReceivableMember | $ 48,000 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = fsp_AllowanceForStraightLineRentReceivableMember | $ 28,000 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = fsp_AllowanceForStraightLineRentReceivableMember

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- Definition Represents deferred rent receivables net including amounts for assets held for sale. + References No definition available. + Details
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- Definition Represents the maximum time period within which the sale or disposal of disposal group is expected. + References No definition available. + Details
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- Definition Represents the maximum period within which receivables are expected to be collected. + References No definition available. + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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