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Related Party Transactions and Investments in Non-Consolidated Entities (Details) (USD $)	12 Months Ended	0 Months Ended	1 Months Ended	0 Months Ended
	Dec. 31, 2014 entity	Sep. 22, 2006	Sep. 30, 2006	Sep. 30, 2013	Jan. 04, 2013	Dec. 31, 2013 entity	Dec. 31, 2012 entity	Dec. 20, 2012
Related Party Transactions and Investments in Non-Consolidated Entities
Sponsored REITs (in entities)	10fsp_NumberOfSponsoredREITs					14fsp_NumberOfSponsoredREITs	15fsp_NumberOfSponsoredREITs
Number of REITs in which the entity holds non-controlling preferred stock interest	2fsp_NumberOfREITsInWhichEntityHoldsNoncontrollingPreferredStockInterest
Sponsored REIT
Number of sponsored REITs having properties which were sold	4fsp_NumberOfSponsoredREITsHavingPropertiesWhichWereSold
Number of entities holding mortgage loans	2fsp_NumberOfEntitiesHoldingMortgageLoans
FSP 505 Waterford Corp.
Sponsored REIT
Principal amount of loan						2,350,000us-gaap_DebtInstrumentFaceAmount / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSP505WaterfordCorpMember
Phoenix Tower
Sponsored REIT
Preferred shares purchased		48fsp_EquityMethodInvestmentPreferredStockPurchased / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPPhoenixTowerCorpMember	48fsp_EquityMethodInvestmentPreferredStockPurchased / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPPhoenixTowerCorpMember
Percentage of outstanding preferred shares purchased		4.60%fsp_EquityMethodInvestmentPercentageOfPreferredStockPurchased / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPPhoenixTowerCorpMember	4.60%fsp_EquityMethodInvestmentPercentageOfPreferredStockPurchased / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPPhoenixTowerCorpMember
Beneficial interest	18,000us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPPhoenixTowerCorpMember							4,866,000us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPPhoenixTowerCorpMember
Phoenix Tower | Preferred shares ownership
Sponsored REIT
Amount received				96,000us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital / us-gaap_InvestmentTypeAxis = us-gaap_PreferredStockMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPPhoenixTowerCorpMember	4,752,000us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital / us-gaap_InvestmentTypeAxis = us-gaap_PreferredStockMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPPhoenixTowerCorpMember
FSP Galleria North Corp.
Sponsored REIT
Repayment of principal	13,880,000us-gaap_RepaymentsOfDebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPGalleriaNorthCorpMember
FSP Highland Place I Corp.
Sponsored REIT
Repayment of principal	3,395,000us-gaap_RepaymentsOfDebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fsp_FSPHighLandPlaceICorpMember

X

- Definition

Represents the percentage of the equity method investee's outstanding preferred stock purchased by the entity during the reporting period.

+ References

No definition available.

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- Definition

The number of preferred stock purchased in the investee accounted for under the equity method of accounting.

+ References

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- Definition

Represents the number of entities holding mortgage loans.

+ References

No definition available.

+ Details

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- Definition

Represents the number of entities in which the reporting entity has a non-controlling preferred stock interest.

+ References

No definition available.

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Number of sponsored real estate investment trusts in which the entity has an interest.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



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

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-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

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- Definition

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Topic 323

-SubTopic 10

-Section 45

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Cash dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations that are returns of capital. Excludes dividends or distributions from equity method investments classified as operating activities.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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