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Significant Accounting Policies (Details) (USD $) |  | 1 Months Ended
--- | --- | ---
Dec. 31, 2012 entity | Dec. 31, 2012 FSP Phoenix Tower Corp | Sep. 30, 2006 FSP Phoenix Tower Corp | Dec. 31, 2007 East Wacker | May 31, 2009 Grand Boulevard
Significant Accounting Policies |  |  |  |  |
Number of corporations organized to operate as real estate investment trusts (REITs) | 15 |  |  |  |
Number of REITs in which the entity holds non-controlling preferred stock interest | 2 |  |  |  |
Sponsored REITs |  |  |  |  |
Preferred shares purchased |  |  | 48 | 965.75 | 175.5
Percentage of outstanding preferred shares purchased |  |  | 4.60% | 43.70% | 27.00%
Net cost of preferred shares purchased |  |  | $ 4,116,000 | $ 82,813,000 | $ 15,049,000
Gain on sale, less applicable income tax |  | $ 1,582,000 |  |  |

X
- Definition Represents the percentage of the equity method investee's outstanding preferred stock purchased by the entity during the reporting period. + References No definition available. + Details
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Namespace Prefix: | fsp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of preferred stock purchased in the investee accounted for under the equity method of accounting. + References No definition available. + Details
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Namespace Prefix: | fsp_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the cost of preferred stock purchased in the investee accounted for under the equity method of accounting, net of commission and fees paid. + References No definition available. + Details
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Namespace Prefix: | fsp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the number of entities in which the reporting entity has a non-controlling common stock interest. + References No definition available. + Details
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Namespace Prefix: | fsp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of entities in which the reporting entity has a non-controlling preferred stock interest. + References No definition available. + Details
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Namespace Prefix: | fsp_
Data Type: | xbrli:integerItemType
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Period Type: | instant

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- Definition This item represents the amount of gain (loss) arising from the disposal of an equity method investment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Details
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