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Related Party Transactions and Investments in Non-Consolidated Entities - Sponsored REIT Loans outstanding (Details)
 3 Months Ended
Mar. 31, 2019
USD ($)
loan
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Sponsored REITs      
Number of Sponsored REIT loans which bear interest at a fixed rate | loan 2    
Maximum amount of loan $ 79,500,000    
Amount Drawn $ 72,795,000   $ 70,660,000
Sponsored REITs      
Sponsored REITs      
Term of sponsored REIT loan secured by mortgage, minimum 1 year    
Term of sponsored REIT loan secured by mortgage, maximum 3 years    
Interest income and fees from the Sponsored REIT Loans $ 1,294,000 $ 1,120,000  
Secured revolving lines of credit | FSP Satellite Place Corp.      
Sponsored REITs      
Maximum amount of loan 5,500,000    
Amount Drawn $ 795,000    
Sponsored REIT loans, base rate 30-day LIBOR    
Sponsored REIT loans, base rate margin (as a percent) 4.40%    
Draw Fee (as a percent) 0.50%    
Interest rate (as a percent) 6.88%    
Secured revolving lines of credit | FSP Energy Tower I Corp.      
Sponsored REITs      
Maximum amount of loan $ 20,000,000    
Amount Drawn $ 18,000,000    
Sponsored REIT loans, base rate 30-day LIBOR    
Sponsored REIT loans, base rate margin (as a percent) 5.00%    
Draw Fee (as a percent) 0.50%    
Interest rate (as a percent) 7.48%    
Mortgage loan secured by property | FSP Energy Tower I Corp.      
Sponsored REITs      
Maximum amount of loan $ 33,000,000    
Amount Drawn $ 33,000,000    
Fixed rate of interest (as a percent) 6.41%    
Interest rate (as a percent) 6.41%    
Extension fee $ 108,900    
Mortgage loan secured by property | FSP Monument Circle LLC      
Sponsored REITs      
Maximum amount of loan 21,000,000    
Amount Drawn $ 21,000,000    
Fixed rate of interest (as a percent) 7.19%    
Interest rate (as a percent) 7.19%    
Origination fee $ 164,000    
Exit fee $ 38,000