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Related Party Transactions and Investments in Non-Consolidated Entities (Details 4) (USD $)
 6 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Jun. 30, 2013
Sponsored REITs
Jun. 30, 2013
Secured revolving lines of credit
FSP High Land Place I Corp.
Jun. 30, 2013
Secured revolving lines of credit
FSP Satellite Place Corp.
Jun. 30, 2013
Secured revolving lines of credit
FSP 1441 Main Street Corp.
Jun. 30, 2013
Secured revolving lines of credit
FSP 505 Waterford Corp.
Jun. 30, 2013
Secured revolving lines of credit
FSP Galleria North Corp.
Jun. 30, 2013
Secured construction loan
FSP 385 Interlocken Development Corp.
Jun. 30, 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                
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 97,846,000   93,896,000   1,375,000 5,500,000 9,000,000 2,350,000 9,080,000 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 30-day LIBOR    
Sponsored REIT loans, base rate margin (as a percent)         4.40% 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% 0.50%      
Interest rate (as a percent)         4.59% 4.59% 4.59% 4.59% 5.19% 4.59% 6.41%  
Payment of loan fee related to fixed mortgage component                       300,630
Exit fees (as a percent)                     0.982%  
Interest income and fees from the Sponsored REIT Loans $ 2,730,000 $ 5,102,000