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Related Party Transactions and Investments in Non-Consolidated Entities (Details 4) (USD $)
 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Sponsored REITs
Dec. 31, 2011
Acquisition Loan
Dec. 31, 2013
Acquisition Loan
Dec. 31, 2012
Acquisition Loan
Dec. 31, 2011
Acquisition Loan
FSP Union Centre Corp
item
Dec. 31, 2013
Secured revolving lines of credit
FSP High Land Place I Corp.
Dec. 31, 2013
Secured revolving lines of credit
FSP Satellite Place Corp.
Dec. 31, 2013
Secured revolving lines of credit
FSP 1441 Main Street Corp.
Dec. 31, 2013
Secured revolving lines of credit
FSP Galleria North Corp.
Dec. 31, 2013
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, 2013
Mortgage loan secured by property
FSP Energy Tower Corp.
Jul. 05, 2012
Mortgage loan secured by property
FSP Energy Tower Corp.
Sponsored REITs                                      
Term of sponsored REIT loan secured by mortgage, minimum       2 years                              
Term of sponsored REIT loan secured by mortgage, maximum       3 years                              
Loan fee related to fixed mortgage component                           $ 301,000 $ 300,000   $ 762,000    
Amount drawn from revolving line of credit component                             30,000,000        
Repayment fee (as a percent)                           0.49%   0.98%      
Term of loan         2 years                            
Number of loans outstanding               1                      
Payment of loan fee related to fixed mortgage component                           520,000         300,630
Maximum amount of loan 111,800,000               5,500,000 5,500,000 10,800,000 15,000,000 42,000,000         33,000,000  
Amount Drawn 99,746,000 93,896,000       0 0   1,825,000 5,500,000 9,000,000 12,880,000 37,541,000         33,000,000  
Sponsored REIT loans, base rate                 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% 4.40% 5.00% 4.40%            
Fixed rate of interest (as a percent)                                   6.41%  
Draw Fee (as a percent)                 0.50% 0.50% 0.50% 0.50%              
Interest rate (as a percent)                 4.57% 4.57% 4.57% 5.17% 4.57%         6.41%  
Exit fees (as a percent)                                   0.982%  
Interest income and fees from the Sponsored REIT Loans $ 5,568,000 $ 9,798,000 $ 3,087,000