General form of registration statement for all companies including face-amount certificate companies

Debt Obligations Net - Additional information (Details)

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Debt Obligations Net - Additional information (Details) - USD ($)
$ in Thousands
12 Months Ended
Oct. 25, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2021
Oct. 30, 2020
Sep. 14, 2020
Feb. 20, 2020
Nov. 29, 2019
Feb. 22, 2019
Dec. 13, 2018
Feb. 22, 2017
Debt Disclosure [Line Items]                        
Principal amount   $ 377,000     $ 850,000              
Owl Rock Capital and Subsidiaries and Owl Rock Capital Securities LLC                        
Debt Disclosure [Line Items]                        
Deferred financing cost amortization expense   787 $ 225 $ 397                
Principal amount   $ 377,000 316,000                  
Revolving Credit Facility #1 [Member] | Owl Rock Capital and Subsidiaries and Owl Rock Capital Securities LLC                        
Debt Disclosure [Line Items]                        
Line of credit facility, maximum borrowing capacity           $ 105,000   $ 80,000     $ 50,000 $ 10,000
Line of credit facility, interest rate description   Borrowings under the credit facility bear interest at a rate per annum equal to: (i) in the case of LIBOR – based advance, the greater of LIBOR + 3.05 % and 4.25%, or (ii) in the case of prime rate – based advance, the greater of prime rate, as published by the lending bank, + 0.25 % and 4.25%.                    
Percentage of fees paid   The Company also pays fees of 0.5% and 2.0% per annum on the unused portion of the credit facility and outstanding letters of credit, respectively.                    
Line of credit facility, amendment description   On March 12, 2018, the credit facility was amended to, among other things: (i) increase facility size to $36.5 million, (ii) extend the maturity date to February 28, 2022, (iii) reduce the London Interbank Offered Rate (“LIBOR”) – based rate from LIBOR + 3.25% to LIBOR + 3.05% and prime rate – based rate from prime rate + 0.50% to prime rate + 0.25%, and (iv) added a letter of credit sublimit of $5 million.                    
Principal amount   $ 105,000 50,000                  
Revolving Credit Facility #2 [Member] | Owl Rock Capital and Subsidiaries and Owl Rock Capital Securities LLC                        
Debt Disclosure [Line Items]                        
Line of credit facility, maximum borrowing capacity             $ 22,000   $ 16,000 $ 10,000    
Line of credit facility, interest rate description   Borrowings under the credit facility bear interest at a rate per annum equal to: (i) in the case of LIBOR – based advances, the greater of LIBOR + 3.05% and 4.25%, or (ii) in the case of the prime rate – based advances, the greater of the prime rate, as published by the lending bank, + 0.25% and 4.25%.                    
Percentage of fees paid   The Company also pays a fee of 0.5% per annum on the unused portion of the credit facility.                    
Principal amount   $ 22,000 16,000                  
Term Loan [Member] | Owl Rock Capital and Subsidiaries and Owl Rock Capital Securities LLC                        
Debt Disclosure [Line Items]                        
Principal amount $ 250,000 $ 250,000 $ 250,000                  
LIBOR [Member] | Term Loan [Member] | Owl Rock Capital and Subsidiaries and Owl Rock Capital Securities LLC                        
Debt Disclosure [Line Items]                        
Debt instrument, basis spread on variable rate 6.00%                      
LIBOR Floor [Member] | Term Loan [Member] | Owl Rock Capital and Subsidiaries and Owl Rock Capital Securities LLC                        
Debt Disclosure [Line Items]                        
Debt instrument, basis spread on variable rate 1.50%