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Related Party Transactions and Investments in Non-Consolidated Entities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 entity	Mar. 31, 2011 entity
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
Distributions from non-consolidated REITs	$ 929	$ 1,767

X

- Definition

This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element includes distributions that constitute a return of investment.

+ 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 preferred 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

Number of sponsored real estate investment trusts in which the entity has an interest.

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No definition available.

+ Details

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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.

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No definition available.

+ Details

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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

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Namespace Prefix:	fsp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_RelatedPartyTransactionsAbstract
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Balance Type:	na
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