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v2.4.1.9

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

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- 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

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

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- 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

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- 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

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- 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