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Related Party Transactions and Investments in Non-Consolidated Entities - Sponsored REIT Loans outstanding (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) loan | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Sponsored REITs |  |  |
Number of Sponsored REIT loans which bear interest at a fixed rate | loan | 2 |  |
Maximum amount of loan | $ 79,500,000 |  |
Amount Drawn | 70,660,000 | $ 71,720,000 |
Interest income and fees from the Sponsored REIT Loans | $ 4,610,000 | $ 4,687,000 | $ 4,834,000
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 | $ 1,060,000 |  |
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) | 6.78% |  |
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) | 7.38% |  |
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 |  |
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) | 7.19% |  |
Interest rate (as a percent) | 7.19% |  |
Origination fee | $ 164,000 |  |
Exit fee | $ 38,000 |  |

X
- Definition Represents the extension fee paid by the borrower. + References No definition available. + Details
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Namespace Prefix: | fsp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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Namespace Prefix: | fsp_
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Balance Type: | debit
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- 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

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- Definition Represents the percentage of fixed rate of interest on the loans receivable. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Stated maximum period for maturity of the mortgage loan receivable on real estate. + References No definition available. + Details
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- 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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Namespace Prefix: | fsp_
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Balance Type: | debit
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- Definition The interest rate of the mortgage loan receivable at the end of the period. + References No definition available. + Details
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- 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 + Details
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- Definition Expenses paid for obtaining loans which includes expenses such as application and origination fees. + References No definition available. + Details
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- 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 + Details
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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. + Details
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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. + References No definition available. + Details
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- Details
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- Details
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- Details
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