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Subsequent Events (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		0 Months Ended
	Mar. 31, 2015 sqft	Mar. 31, 2014 sqft	Apr. 08, 2015	Apr. 10, 2015
Subsequent Events
Area of property (in square feet)	9,310,131us-gaap_AreaOfRealEstateProperty	9,686,055us-gaap_AreaOfRealEstateProperty
Cash dividend declared per share (in dollars per share)	$ 0.19us-gaap_CommonStockDividendsPerShareDeclared	$ 0.19us-gaap_CommonStockDividendsPerShareDeclared
Subsequent Events | Office property in Atlanta, Georgia
Subsequent Events
Area of property (in square feet)			442,130us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = fsp_OfficePropertyInAtlantaGeorgiaMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Payments to acquire office property			$ 78.0us-gaap_PaymentsToAcquireBuildings / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = fsp_OfficePropertyInAtlantaGeorgiaMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Cash distribution declared | Subsequent Events
Subsequent Events
Cash dividend declared per share (in dollars per share)				$ 0.19us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

The cash outflow for acquisition of buildings (properties) whether for investment or use.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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