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Related Party Transactions and Investments in Non-Consolidated Entities - Sponsored REIT Loans outstanding (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) loan	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Sponsored REITs
Number of Sponsored REIT loans which bear interest at a fixed rate | loan	2
Maximum amount of loan	$ 90,300,000
Amount Drawn	81,780,000	$ 118,641,000
Interest income and fees from the Sponsored REIT Loans	$ 4,834,000	$ 5,230,000	$ 5,296,000
Sponsored REITs
Sponsored REITs
Term of sponsored REIT loan secured by mortgage, minimum	1 year
Term of sponsored REIT loan secured by mortgage, maximum	3 years
Secured revolving lines of credit | FSP Satellite Place Corp.
Sponsored REITs
Maximum amount of loan	$ 5,500,000
Amount Drawn	$ 3,180,000
Sponsored REIT loans, base rate	30-day LIBOR
Sponsored REIT loans, base rate margin (as a percent)	4.40%
Draw Fee (as a percent)	0.50%
Interest rate (as a percent)	5.03%
Secured revolving lines of credit | FSP 1441 Main Street Corp.
Sponsored REITs
Maximum amount of loan	$ 10,800,000
Amount Drawn	$ 9,000,000
Sponsored REIT loans, base rate	30-day LIBOR
Sponsored REIT loans, base rate margin (as a percent)	4.40%
Draw Fee (as a percent)	0.50%
Interest rate (as a percent)	5.03%
Secured revolving lines of credit | FSP Energy Tower I Corp.
Sponsored REITs
Maximum amount of loan	$ 20,000,000
Amount Drawn	$ 15,600,000
Sponsored REIT loans, base rate	30-day LIBOR
Sponsored REIT loans, base rate margin (as a percent)	5.00%
Draw Fee (as a percent)	0.50%
Interest rate (as a percent)	5.63%
Mortgage loan secured by property | FSP Monument Circle LLC
Sponsored REITs
Maximum amount of loan	$ 21,000,000
Amount Drawn	$ 21,000,000
Fixed rate of interest (as a percent)	4.90%
Interest rate (as a percent)	4.90%
Origination fee	$ 164,000
Exit fee	38,000
Mortgage loan secured by property | FSP Energy Tower I Corp.
Sponsored REITs
Maximum amount of loan	33,000,000
Amount Drawn	$ 33,000,000
Fixed rate of interest (as a percent)	6.41%
Interest rate (as a percent)	6.41%
Extension fee	$ 108,900

X

- Definition

Represents the extension fee paid by the borrower.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Reflects the maximum amount of loan due from related parties at the balance sheet date.

+ References

No definition available.

+ Details

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X

- Definition

Represents the percentage of draw fee of each new advance given.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Represents the percentage of fixed rate of interest on the loans receivable.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Stated maximum period for maturity of the mortgage loan receivable on real estate.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Stated minimum period for maturity of the mortgage loan receivable on real estate.

+ References

No definition available.

+ Details

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- Definition

Represents the exit fee to be paid by the borrowed when repayment is made.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The interest rate of the mortgage loan receivable at the end of the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	fsp_
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X

- Definition

Represents the number of Sponsored REIT loans which bear interest at a fixed rate.

+ References

No definition available.

+ Details

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- Definition

Interest and fee income related to commercial loans including industrial and agricultural, real estate (commercial and residential, construction and development), trade financing, and lease financing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.1)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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- Definition

Expenses paid for obtaining loans which includes expenses such as application and origination fees.

+ References

No definition available.

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Balance Type:	debit
Period Type:	duration

X

- Definition

For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(e))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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- Definition

The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin.

+ References

No definition available.

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- Definition

The reference rate for the variable rate of the loans receivable, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Details

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- Details

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- Details

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