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Subsequent Events (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2012 sqft | Jun. 30, 2012 | Mar. 31, 2012 | Sep. 30, 2011 sqft | Jun. 30, 2011 | Mar. 31, 2011 | Oct. 10, 2012 Subsequent Event Office property in Houston, Texas item sqft | Oct. 31, 2012 Subsequent Event Commercial property in Southfield, Michigan | Oct. 12, 2012 Subsequent Event Cash distribution declared
Subsequent events |  |  |  |  |  |  |  |  |
Cash dividend declared per share | $ 0.19 | $ 0.19 | $ 0.19 | $ 0.19 | $ 0.19 | $ 0.19 |  |  | $ 0.19
Number of buildings agreed to be acquired by the entity |  |  |  |  |  |  | 2 |  |
Area of property (in square foot) | 7,439,195 |  |  | 6,929,891 |  |  | 629,000 |  |
Purchase price of property acquired in Houston, Texas |  |  |  |  |  |  | $ 154.8 |  |
Sale price of properties under the agreement |  |  |  |  |  |  |  | $ 0.7 |

X
- Definition Represents the number of buildings agreed to be acquired by the entity during the period. + References No definition available. + Details
Name: | fsp_NumberOfPropertiesAcquired
Namespace Prefix: | fsp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the aggregate purchase price excluding closing costs and adjustments of real estate properties acquired by the entity during the period. + References No definition available. + Details
Name: | fsp_RealEstateAggregatePurchasePrice
Namespace Prefix: | fsp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the sale price of the property agreed to be sold by the entity during the period. + References No definition available. + Details
Name: | fsp_RealEstateAggregateSalesPrice
Namespace Prefix: | fsp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 + Details
Name: | us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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