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Dispositions and Discontinued Operations (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 0 Months Ended
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Dec. 31, 2014 | Dec. 03, 2014
Gain (loss) on sale of property |  |
Gain (loss) on sale of property | $ 940 us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes |
Commercial property in Colorado Springs, CO |  |
Gain (loss) on sale of property |  |
Gain (loss) on sale of property |  | $ 900 us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = fsp_OfficePropertyInColoradoSpringsColoradoMember

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- Definition This element represents the amount of gain (loss) on sale of properties during the reporting period net of the applicable income taxes realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 15 -Paragraph a -Subparagraph 1(ii) -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 974 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-15.(a)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=6875705&loc=d3e641549-123027 + Details
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |