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Organization (Details)	Dec. 31, 2016 ft² property entity item	Dec. 31, 2015 entity	Dec. 31, 2014 entity
Properties
Rentable square feet | ft²	1,099,000
Number of REITs in which the entity holds non-controlling common stock interest | entity	7	9	10
Number of REITs in which the entity holds non-controlling preferred stock interest | entity	2
Number of Sponsored REITs | entity	7	9	10
Number of properties | property	36
Number of properties in redevelopment	1
Number of promissory notes secured by mortgages on real estate owned by Sponsored REITs	5
Mortgage loan secured by property
Properties
Number of promissory notes secured by mortgages on real estate owned by Sponsored REITs	2
Secured revolving lines of credit
Properties
Number of promissory notes secured by mortgages on real estate owned by Sponsored REITs	3
FSP Investments LLC
Properties
Ownership interest (as a percent)	100.00%
FSP Property Management LLC
Properties
Ownership interest (as a percent)	100.00%
FSP Holdings LLC
Properties
Ownership interest (as a percent)	100.00%
FSP Protective TRS Corp.
Properties
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

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

X

- Definition

Represents the number of properties in redevelopment.

+ References

No definition available.

+ Details

Name:	fsp_NumberOfPropertiesInRedevelopment
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

- Definition

Represents the number of sponsored REITs the Company held an interest in at period end.

+ References

No definition available.

+ Details

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

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

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfRealEstateProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_RealEstateInvestmentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_MortgagesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=fsp_RevolvingLineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=fsp_FSPInvestmentsLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=fsp_FSPPropertyManagementLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=fsp_FSPHoldingsLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=fsp_FSPProtectiveTRSCorpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: