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Organization, Properties, Basis of Presentation, Financial Instruments and Recent Accounting Standards (Details)	Mar. 31, 2014 entity note
Organization
Number of promissory notes secured by mortgages on real estate owned by Sponsored REITs	6
Number of corporations organized to operate as real estate investment trusts (REITs)	14
Number of REITs in which the entity holds non-controlling preferred stock interest	2
Mortgage loan
Organization
Number of promissory notes secured by mortgages on real estate owned by Sponsored REITs	1
Secured construction loan
Organization
Number of promissory notes secured by mortgages on real estate owned by Sponsored REITs	1
Revolving lines of credit
Organization
Number of promissory notes secured by mortgages on real estate owned by Sponsored REITs	4
FSP Investments LLC
Organization
Ownership interest (as a percent)	100.00%
FSP Property Management LLC
Organization
Ownership interest (as a percent)	100.00%
FSP Holdings LLC
Organization
Ownership interest (as a percent)	100.00%
FSP Protective TRS Corp.
Organization
Ownership interest (as a percent)	100.00%

X

- Definition

Represents the number of promissory notes secured by mortgages on real estate owned by Sponsored REITs.

+ References

No definition available.

+ Details

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Namespace Prefix:	fsp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

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

+ References

No definition available.

+ Details

Name:	fsp_NumberOfREITsInWhichEntityHoldsNoncontrollingCommonStockInterest
Namespace Prefix:	fsp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

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

+ References

No definition available.

+ Details

Name:	fsp_NumberOfREITsInWhichEntityHoldsNoncontrollingPreferredStockInterest
Namespace Prefix:	fsp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	fsp_OrganizationAndConsolidationLineItems
Namespace Prefix:	fsp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the ownership interest percentage of the parent in consolidated entities.

+ References

No definition available.

+ Details

Name:	fsp_OwnershipInterestPercentageOfParentInConsolidatedEntities
Namespace Prefix:	fsp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant