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Related Party Transactions and Investments in Non-Consolidated Entities (Details 4) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended |  |  |  | 3 Months Ended | 12 Months Ended |  |  | 3 Months Ended | 12 Months Ended |  |  | 3 Months Ended | 12 Months Ended |  |  | 12 Months Ended | 3 Months Ended | 10 Months Ended | 12 Months Ended |  |  | 1 Months Ended | 12 Months Ended |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Sponsored REITs | Dec. 31, 2012 Acquisition Loan | Dec. 31, 2011 Acquisition Loan FSP Union Centre Corp item | Mar. 31, 2011 Secured revolving lines of credit FSP High Land Place I Corp. | Feb. 28, 2011 Secured revolving lines of credit FSP High Land Place I Corp. | Jan. 31, 2011 Secured revolving lines of credit FSP High Land Place I Corp. | Dec. 31, 2012 Secured revolving lines of credit FSP High Land Place I Corp. | Mar. 02, 2011 Secured revolving lines of credit FSP High Land Place I Corp. | Feb. 02, 2011 Secured revolving lines of credit FSP High Land Place I Corp. | Jan. 02, 2011 Secured revolving lines of credit FSP High Land Place I Corp. | Mar. 31, 2011 Secured revolving lines of credit FSP Satellite Place Corp. | Dec. 31, 2012 Secured revolving lines of credit FSP Satellite Place Corp. | Mar. 30, 2011 Secured revolving lines of credit FSP Satellite Place Corp. | Jan. 02, 2011 Secured revolving lines of credit FSP Satellite Place Corp. | Mar. 31, 2011 Secured revolving lines of credit FSP 1441 Main Street Corp. | Dec. 31, 2012 Secured revolving lines of credit FSP 1441 Main Street Corp. | Mar. 30, 2011 Secured revolving lines of credit FSP 1441 Main Street Corp. | Jan. 02, 2011 Secured revolving lines of credit FSP 1441 Main Street Corp. | Mar. 31, 2011 Secured revolving lines of credit FSP 505 Waterford Corp. | Dec. 31, 2012 Secured revolving lines of credit FSP 505 Waterford Corp. | Mar. 30, 2011 Secured revolving lines of credit FSP 505 Waterford Corp. | Jan. 02, 2011 Secured revolving lines of credit FSP 505 Waterford Corp. | Dec. 31, 2012 Secured revolving lines of credit FSP Galleria North Corp. | Mar. 31, 2011 Secured construction loan FSP 385 Interlocken Development Corp. | Dec. 31, 2009 Secured construction loan FSP 385 Interlocken Development Corp. | Dec. 31, 2012 Secured construction loan FSP 385 Interlocken Development Corp. | Mar. 30, 2011 Secured construction loan FSP 385 Interlocken Development Corp. | Jan. 02, 2011 Secured construction loan FSP 385 Interlocken Development Corp. | Jul. 31, 2012 Mortgage loan secured by property | Mar. 31, 2012 Mortgage loan secured by property | Dec. 31, 2012 Mortgage loan secured by property | Dec. 31, 2011 Mortgage loan secured by property | Dec. 31, 2012 Mortgage loan secured by property FSP Energy Tower Corp. | Jul. 05, 2012 Mortgage loan secured by property FSP Energy Tower Corp.
Sponsored REITs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee paid by borrower at loan origination |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 210,000 |  |  |  |  |  |  |  |  |
Term of loan |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans outstanding |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of sponsored REIT loan secured by mortgage, minimum |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of sponsored REIT loan secured by mortgage, maximum |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of loan | 118,800,000 |  |  |  |  |  |  |  |  | 5,500,000 |  |  |  |  | 5,500,000 |  |  |  | 10,800,000 |  |  |  | 7,000,000 |  |  | 15,000,000 |  |  | 42,000,000 |  |  |  |  |  |  | 33,000,000 |
Amount Drawn | 93,896,000 | 140,516,000 |  |  |  |  |  |  |  | 1,125,000 |  |  |  |  | 5,500,000 |  |  |  | 8,500,000 |  |  |  | 2,350,000 |  |  | 5,880,000 |  |  | 37,541,000 |  |  |  | 30,000,000 |  |  | 33,000,000 |
Sponsored REIT loans, base rate |  |  |  |  |  |  | 30-day LIBOR | 30-day LIBOR | 30-day LIBOR | 30-day LIBOR |  |  |  | 30-day LIBOR | 30-day LIBOR |  |  | 30-day LIBOR | 30-day LIBOR |  |  | 30-day LIBOR | 30-day LIBOR |  |  | 30-day LIBOR | 30-day LIBOR |  | 30-day LIBOR |  |  |  |  |  |  |  |
Sponsored REIT loans, base rate margin (as a percent) |  |  |  |  |  |  |  |  |  | 4.40% | 4.40% | 3.00% | 3.00% |  | 4.40% | 3.00% | 3.00% |  | 4.40% | 3.00% | 3.00% |  | 4.40% | 3.00% | 3.00% | 5.00% |  |  | 4.40% | 3.00% | 3.00% |  |  |  |  |  |
Fixed rate of interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.41% |
Draw Fee (as a percent) |  |  |  |  |  |  |  |  | 0.50% | 0.50% |  |  |  |  | 0.50% |  |  |  | 0.50% |  |  |  | 0.50% |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 4.62% |  |  |  |  | 4.62% |  |  |  | 4.62% |  |  |  | 4.62% |  |  | 5.22% |  |  | 4.62% |  |  |  |  |  |  | 6.41% |
Loan fee related to fixed mortgage component |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 301,000 | 300,000 |  | 762,000 |  |
Exit fees (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.982% |
Payment of loan fee related to fixed mortgage component |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,630
Payment of loan fee related to fixed mortgage component |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 520,000 |  |  |  |  |
Amount drawn from revolving line of credit component |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,000,000 |  |  |  |
Repayment fee (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.49% |  | 0.98% |  |  |
Interest income and fees from the Sponsored REIT Loans | $ 9,798,000 | $ 3,087,000 | $ 1,609,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Reflects the amount drawn from revolving line of credit component of loan due from related parties at the balance sheet date. + References No definition available. + Details
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- 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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- Definition Represents the percentage of draw fee of each new advance given. + References No definition available. + Details
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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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- Definition Represents the percentage of fee charged on all amounts repaid under the loan. + References No definition available. + Details
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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 Term of mortgage loan represented in number of years. + References No definition available. + Details
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- Definition Number of loans provided under the mortgage loan facility. + References No definition available. + Details
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- Definition Represents the exit fee as a percent of the principal amount on mortgage loans. + References No definition available. + Details
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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 payment of loan exit fees on mortgage loans during the reporting period. + References No definition available. + Details
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- Definition Represents the payment of loan fees on mortgage loans during the reporting period. + References No definition available. + Details
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- Definition Commitment fees received on mortgage loans during the reporting period. + References No definition available. + Details
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- Definition Loan fees received on mortgage loans during the reporting period. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 9 + 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 OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 8 -Subparagraph j -Chapter V -Subsection I -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph e -Article 9 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 57 -Paragraph 2 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: 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 + 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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