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Related Party Transactions - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended 16 Months Ended 26 Months Ended
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2018
Related Party Transaction [Line Items]            
Performance fee percentage   10.00%        
Hurdle rate on average adjusted capital   1.625%        
Annualized hurdle rate   6.50%        
Quarterly core earnings rate   1.806%        
Annualized core earnings rate   7.222%        
Minimum gross proceeds from public offering to reimburse expense   $ 250,000,000        
Reimbursement due from sponsor   708,000 $ 541,000   $ 708,000 $ 708,000
Due to Related Parties   912,000 341,000   $ 912,000 912,000
Share Purchased   52,627,000 28,998,000 $ 200,000    
Organization and offering costs           $ 6,490,000
Common Class Y [Member]            
Related Party Transaction [Line Items]            
Base management fee   0        
Common Class F [Member]            
Related Party Transaction [Line Items]            
Base management fee   0        
Performance fees on shares   $ 0        
Maximum [Member]            
Related Party Transaction [Line Items]            
Organization and offering expenses reimbursement as percentage of gross proceeds from public offering   15.00%     15.00% 15.00%
FS Real Estate Advisor [Member]            
Related Party Transaction [Line Items]            
Base management fee percentage   1.25%        
Base management fee description   Equal to 1.25% of the NAV for the Company's Class T, Class S, Class D, Class M and Class I shares, payable quarterly and in arrears.        
Percentage of base management fees and performance fees payable to advisor   50.00%        
Minimum gross proceeds from public offering to reimburse expense   $ 250,000 250,000      
Payment financing costs     341,000      
FS Real Estate Advisor [Member] | Common Class S [Member]            
Related Party Transaction [Line Items]            
Dealer manager upfront selling commissions fees percentage   3.50%        
Stockholders servicing fee percentage on aggregate NAV of outstanding shares   0.85%        
Stockholder servicing fees percentage   8.75%     8.75% 8.75%
FS Real Estate Advisor [Member] | Common Class T [Member]            
Related Party Transaction [Line Items]            
Dealer manager upfront selling commissions fees percentage   3.00%        
Upfront dealer manager fees percentage   0.50%        
Stockholders servicing fee percentage on aggregate NAV of outstanding shares   0.85%        
Advisor stockholders servicing fee percentage on aggregate NAV of outstanding shares   0.65%        
Dealer stockholders servicing fee percentage on aggregate NAV of outstanding shares   0.20%        
Stockholder servicing fees percentage   8.75%     8.75% 8.75%
Selling commission and fee maximum percent   3.50%        
FS Real Estate Advisor [Member] | Common Class D [Member]            
Related Party Transaction [Line Items]            
Stockholders servicing fee percentage on aggregate NAV of outstanding shares   0.30%        
Stockholder servicing fees percentage   1.25%     1.25% 1.25%
FS Real Estate Advisor [Member] | Common Class M [Member]            
Related Party Transaction [Line Items]            
Stockholders servicing fee percentage on aggregate NAV of outstanding shares   0.30%        
Stockholder servicing fees percentage   7.25%     7.25% 7.25%
FS Real Estate Advisor [Member] | Class D, Class M, Class I, Class S Or Class Y Shares [Member]            
Related Party Transaction [Line Items]            
Selling commissions or dealer manager fees payable   $ 0        
FS Real Estate Advisor [Member] | Common Class I [Member]            
Related Party Transaction [Line Items]            
Stockholders servicing fee   $ 0        
FS Real Estate Advisor [Member] | Class T, Class S, Class D and Class M Share [Member]            
Related Party Transaction [Line Items]            
Stockholder servicing fees percentage   10.00%     10.00% 10.00%
FS Real Estate Advisor [Member] | Maximum [Member]            
Related Party Transaction [Line Items]            
Organization and offering expenses reimbursement as percentage of gross proceeds from public offering   0.75%     0.75% 0.75%
FS Real Estate Advisor and Rialto [Member]            
Related Party Transaction [Line Items]            
Reimbursement expenses due from sponsor   $ 2,271,000     $ 2,812,000  
Amount received as reimbursement         2,104,000  
Reimbursement due from sponsor   $ 708,000     708,000 $ 708,000
FS Real Estate Advisor and Rialto [Member] | Expense Limitation [Member]            
Related Party Transaction [Line Items]            
Percentage of minimum operating expenses to be waived or paid   1.50%        
FS Real Estate Advisor and Rialto [Member] | Maximum [Member] | Expense Limitation [Member]            
Related Party Transaction [Line Items]            
Period for which reimbursement payable   3 years        
Rialto [Member]            
Related Party Transaction [Line Items]            
Purchase of floating-rate whole mortgage loan     $ 9,500,000      
FS Investments and Rialto [Member] | Private Placement [Member]            
Related Party Transaction [Line Items]            
Aggregate proceeds from private placement $ 200,000          
Number of common shares issued 8,000          
Common stock, price per share $ 25.00     $ 25.00    
Common stock allocated to investors   $ 50,000,000     50,000,000 50,000,000
FS Investments and Rialto [Member] | Common Class S [Member] | Private Placement [Member]            
Related Party Transaction [Line Items]            
Investments to be maintained   10,000,000     10,000,000 10,000,000
Net assets   750,000,000     750,000,000 750,000,000
Share Purchased   49,025,000        
FS Investments and Rialto [Member] | Common Class F [Member] | Private Placement [Member]            
Related Party Transaction [Line Items]            
Share Purchased   $ 8,535,000        
Additional Purchase Commitment Period   September 2019        
FS Investments and Rialto [Member] | Maximum [Member] | Common Class F [Member] | Private Placement [Member]            
Related Party Transaction [Line Items]            
Additional common stock allocated to investors   $ 40,000,000     $ 40,000,000 $ 40,000,000