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Organization, Properties, Basis of Presentation, Financial Instruments and Recent Accounting Standards (Details) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2011 | Jun. 30, 2010 | Dec. 31, 2010
Organization, Properties, Basis of Presentation, Financial Instruments and Recent Accounting Standards |  |  |
Number of corporations organized to operate as real estate investment trusts ("REITs") in which the entity holds non-controlling common stock interest | 16 |  |
Number of REITs in which the entity holds non-controlling preferred stock interest | 3 |  |
Number of business segments | 2 |  |
Number of properties sold primarily related to disposition | 2 |  |
Number of properties classified as held-for-sale at December 31, 2010 sold |  |  | 1
Commercial real estate: |  |  |
Number of properties | 34 | 33 |
Rentable square feet (in square feet) | 6,747,815 | 6,418,835 |
FSP Investments LLC |  |  |
Organization |  |  |
Ownership interest (as a percent) | 100.00% |  |
FSP Property Management LLC |  |  |
Organization |  |  |
Ownership interest (as a percent) | 100.00% |  |
FSP Holdings LLC |  |  |
Organization |  |  |
Ownership interest (as a percent) | 100.00% |  |
FSP Protective TRS Corp |  |  |
Organization |  |  |
Ownership interest (as a percent) | 100.00% |  |

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- Definition Represents the number of properties sold primarily related to disposition. + Details
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- Definition Represents the number of entities in which the reporting entity has a non-controlling common stock interest. + Details
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- Definition Represents the number of entities in which the reporting entity has a non-controlling preferred stock interest. + Details
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- Details
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- Definition Represents the ownership interest percentage of the parent in consolidated entities. + Details
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- Definition The number of reportable segments of the entity. + Details
Name: | fsp_ReportableSegmentsNumber
Namespace Prefix: | fsp
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- Definition The number of real estate properties owned as of the balance sheet date. + Details
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- Details
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- Details
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- Definition The amount of square footage related to a real estate property. + Details
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