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Significant Accounting Policies - Asset Held For Sale, Cash (Details)	12 Months Ended
	Dec. 31, 2016
Discontinued Operations
Time period within which sale or disposition of properties held for sale is probable	1 year

X

- Definition

Represents the maximum time period within which the sale or disposal of disposal group is expected.

+ References

No definition available.

+ Details

Name:	fsp_DisposalGroupIncludingDiscontinuedOperationMaximumPeriodForDisposal
Namespace Prefix:	fsp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_DiscontinuedOperationAdditionalDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration