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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2017
Dec. 31, 2014
Commitments and Contingencies [Line Items]        
Commitment to purchase alternative investment   $ 10,000 $ 50,000 $ 50,000
Future Funding Commitments $ 31,214 $ 31,720    
European Non-Performing Loan Fund, LP        
Commitments and Contingencies [Line Items]        
Funded commitment amount 35,800      
Distressed Debt Fund, LP        
Commitments and Contingencies [Line Items]        
Funded commitment amount 33,000      
Unfunded Commitments | European Non-Performing Loan Fund, LP        
Commitments and Contingencies [Line Items]        
Future Funding Commitments 14,200      
Unfunded Commitments | Distressed Debt Fund, LP        
Commitments and Contingencies [Line Items]        
Future Funding Commitments $ 17,000