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Dispositions of properties (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	0 Months Ended
	Mar. 31, 2015	Feb. 23, 2015	Mar. 31, 2015
Gain (loss) on sale of property
Gain (loss) on sale of property	$ 10,462us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes
Office Property in Plano, Texas
Gain (loss) on sale of property
Gain (loss) on sale of property		1,500us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = fsp_OfficePropertyInPlanoTexasMember
Office Property in Eden Prairie, Minnesota
Gain (loss) on sale of property
Gain (loss) on sale of property			$ 9,000us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = fsp_OfficePropertyInEdenPrairieMinnesotaMember

X

- 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

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