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Significant Accounting Policies (Details) (USD $)		0 Months Ended	1 Months Ended
	Dec. 31, 2013 entity	Dec. 20, 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)	14
Number of REITs in which the entity holds non-controlling preferred stock interest	2
Required investment balance for recognition of distributions received as income	$ 0
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		$ 1,600,000

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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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 amount of required balance of investments for recognition of distributions received as income. These investments are accounted for under the equity method of accounting.

+ References

No definition available.

+ Details

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Namespace Prefix:	fsp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the number of entities in which the reporting entity has a non-controlling common stock interest.

+ References

No definition available.

+ Details

Name:	fsp_NumberOfREITsInWhichEntityHoldsNoncontrollingCommonStockInterest
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

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

X

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of gain (loss) on sale or 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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X

- Details

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