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Retirement Plan (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Retirement Plan
Maximum employee compensation to be deferred per year	$ 17,000us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount
Maximum employer matching contribution as a percentage of annual compensation	3.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Maximum employer matching contribution for each employee	200,000fsp_DefinedContributionPlanEmployerMaximumMatchingContribution
Company's total contribution under 401 (k) plan	$ 127,000us-gaap_DefinedContributionPlanCostRecognized	$ 120,000us-gaap_DefinedContributionPlanCostRecognized	$ 109,000us-gaap_DefinedContributionPlanCostRecognized

X

- Definition

Represents the maximum employer matching contribution for each employee.

+ References

No definition available.

+ Details

Name:	fsp_DefinedContributionPlanEmployerMaximumMatchingContribution
Namespace Prefix:	fsp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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

X

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum amount the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration