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Related Party Transactions and Investments in Non-Consolidated Entities (Details 4) (USD $)
 6 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
Sponsored REITs
Jun. 30, 2014
Secured revolving lines of credit
FSP High Land Place I Corp.
Jun. 30, 2014
Secured revolving lines of credit
FSP Satellite Place Corp.
Jun. 30, 2014
Secured revolving lines of credit
FSP 1441 Main Street Corp.
Jun. 30, 2014
Secured construction loan
FSP 385 Interlocken Development Corp.
Jul. 03, 2014
Mortgage loan secured by property
FSP Energy Tower Corp.
Jun. 30, 2014
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              
Extended term of sponsored REIT loan secured by mortgage, minimum       1 year         1 year    
Maximum amount of loan $ 96,800,000       $ 5,500,000 $ 5,500,000 $ 10,800,000 $ 42,000,000   $ 33,000,000  
Amount Drawn 88,436,000   99,746,000   3,395,000 5,500,000 9,000,000 37,541,000   33,000,000  
Sponsored REIT loans, base rate         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%      
Fixed rate of interest (as a percent)                   6.41%  
Draw Fee (as a percent)         0.50% 0.50% 0.50%        
Interest rate (as a percent)         4.55% 4.55% 4.55% 4.55%   6.41%  
Payment of loan fee related to fixed mortgage component                     300,630
Exit fees (as a percent)                   0.982%  
Extension fee                 108,900    
Interest income and fees from the Sponsored REIT Loans $ 2,816,000 $ 2,730,000