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Related Party Transactions and Investments in Non-Consolidated Entities (Details) | Sep. 30, 2012 entity | Sep. 30, 2011 entity
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Related Party Transactions and Investments in Non-Consolidated Entities |  |
Sponsored REITs (in entities) | 16 |
Fully syndicated (in entities) | 16 |
Not fully syndicated (in entities) |  | 1
Number of REITs in which the entity holds non-controlling preferred stock interest | 3 |

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

X
- Definition Number of sponsored real estate investment trusts in which the entity has an interest. + References No definition available. + Details
Name: | fsp_NumberOfSponsoredREITs
Namespace Prefix: | fsp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of sponsored real estate investment trusts, which are fully syndicated. The entity no longer derives economic benefits or risks from the common stock interest that is retained in the fully syndicated REITs. + References No definition available. + Details
Name: | fsp_NumberOfSponsoredREITsFullySyndicated
Namespace Prefix: | fsp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of sponsored real estate investment trusts, which are not fully syndicated. + References No definition available. + Details
Name: | fsp_NumberOfSponsoredREITsNotFullySyndicated
Namespace Prefix: | fsp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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