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Secured Financings on Investments in Real Estate Debt - Additional Information (Detail) - USD ($)
1 Months Ended 9 Months Ended
Apr. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Weighted Average Interest Rate   1.60% 3.00%
London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Weighted Average Interest Rate   1.60% 1.30%
Barclays MRA [Member]      
Debt Instrument [Line Items]      
Maximum facility size   $ 750,000,000  
DB Secured Financing [Member]      
Debt Instrument [Line Items]      
Maximum facility size $ 252,700,000    
DB Secured Financing [Member] | Three-month EURIBOR [Member]      
Debt Instrument [Line Items]      
Weighted Average Interest Rate 1.80%    
Citi Term Loan TRS [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Description of basis spread on variable rate   The Citi Term Loan TRS bears interest equal to the three-month or one-month USD LIBOR plus a spread, dependent upon the collateral.