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Stockholders' Equity (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	May 06, 2010
Equity offerings
Common stock, shares outstanding (in shares)	100,187,405us-gaap_CommonStockSharesOutstanding		100,187,405us-gaap_CommonStockSharesOutstanding
Dividends declared and paid
Dividends Per Share (in dollars per share)	$ 0.19us-gaap_CommonStockDividendsPerShareDeclared	$ 0.19us-gaap_CommonStockDividendsPerShareDeclared
Total Dividends	$ 19,036,000us-gaap_DividendsCommonStockCash	$ 19,036,000us-gaap_DividendsCommonStockCash
ATM Sales Program
Equity offerings
Maximum aggregate gross sales price of common stock	$ 34,300,000fsp_CommonStockMaximumOfferValuePerSalesProgram / us-gaap_SubsidiarySaleOfStockAxis = fsp_DemandOfferingSalesAgreementMember			$ 75,000,000fsp_CommonStockMaximumOfferValuePerSalesProgram / us-gaap_SubsidiarySaleOfStockAxis = fsp_DemandOfferingSalesAgreementMember

X

- Definition

Maximum value of stock that may be offered and sold under the demand offering sales agreement.

+ References

No definition available.

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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

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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ 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

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

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- Definition

Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

+ 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

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