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Related Party Transactions and Investments in Non-Consolidated Entities (Details 3) - USD ($)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Related Party Transactions and Investments in Non-Consolidated Entities
Asset management fees, low end of range (as a percent)	1.00%
Asset management fees, high end of range (as a percent)	5.00%
Notice period for cancellation of applicable contracts	30 days
Asset management fee income from non-consolidated entities	$ 523,000	$ 744,000

X

- Definition

High end of the range of the asset management fee as a percentage of collected rents.

+ References

No definition available.

+ Details

Name:	fsp_AssetManagementFeesPercentageHighEndOfRange
Namespace Prefix:	fsp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Low end of the range of the asset management fee as a percentage of collected rents.

+ References

No definition available.

+ Details

Name:	fsp_AssetManagementFeesPercentageLowEndOfRange
Namespace Prefix:	fsp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the notice period for cancellation of applicable contracts.

+ References

No definition available.

+ Details

Name:	fsp_NoticePeriodForCancellationOfAssetManagementFeeContract
Namespace Prefix:	fsp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of fixed fee revenue for the management of an investment fund portfolio. Excludes investment advisory, distribution and servicing, and performance fees.

+ References

No definition available.

+ Details

Name:	us-gaap_AssetManagementFees1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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