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Related Party Transactions and Investments in Non-Consolidated Entities (Details 4) (USD $)
 9 Months Ended 9 Months Ended 0 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Sep. 30, 2014
Sponsored REITs
Sep. 30, 2014
Secured revolving lines of credit
FSP Highland Place I Corp.
Sep. 30, 2014
Secured revolving lines of credit
FSP Satellite Place Corp.
Sep. 30, 2014
Secured revolving lines of credit
FSP 1441 Main Street Corp.
Sep. 30, 2014
Secured revolving lines of credit
FSP Energy Tower I Corp.
Sep. 30, 2014
Secured construction loan
FSP 385 Interlocken Development Corp.
Jul. 03, 2014
Mortgage loan secured by property
FSP Energy Tower I Corp.
Sep. 30, 2014
Mortgage loan secured by property
FSP Energy Tower I 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 $ 116,800,000       $ 5,500,000 $ 5,500,000 $ 10,800,000 $ 20,000,000 $ 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 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)         4.56% 4.56% 4.56% 5.16% 4.56%   6.41%
Extension fee                   108,900  
Interest income and fees from the Sponsored REIT Loans $ 4,032,000 $ 4,135,000