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Significant Accounting Policies - Rent Receivables (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Tenant Rent Receivables and Straight-line Rent Receivable
Period within which tenant rent receivables are expected to be collected	1 year
Straight-line rent receivable	$ 49.0	$ 67.8	$ 66.9

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- Definition

Represents deferred rent receivables net including amounts for assets held for sale.

+ References

No definition available.

+ Details

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

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- Definition

Represents the maximum period within which receivables are expected to be collected.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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