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Borrowings - Additional Information (Details)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Nov. 18, 2022
USD ($)
Jun. 23, 2021
USD ($)
Jun. 09, 2021
USD ($)
Apr. 30, 2021
USD ($)
Dec. 18, 2019
USD ($)
Jul. 18, 2019
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
CoverageTest
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Apr. 29, 2022
Apr. 28, 2022
Dec. 31, 2021
USD ($)
Jul. 23, 2021
USD ($)
Jun. 24, 2021
USD ($)
Dec. 31, 2020
USD ($)
Oct. 28, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]                                              
Weighted average stated interest rate on debt outstanding             6.90%       6.90%   6.10%                    
Weighted average maturity on debt outstanding                     4 years 1 month 6 days   5 years                    
Principal amount of borrowings             $ 73,142,000       $ 73,142,000   $ 90,893,000                    
Long-term debt             317,806,000       317,806,000   373,308,000                    
Gain (Loss) on Extinguishment of Debt             (57,000)       (275,000) [1]                        
GLPRF LLC | SOFR                                              
Debt Instrument [Line Items]                                              
Effective interest                               2.80% 2.85%            
CLO Facility | GARS Acquisition                                              
Debt Instrument [Line Items]                                              
Aggregate principal amount                                           $ 420,000,000  
Discount amortized over the remaining term                                           2,400,000  
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility                                              
Debt Instrument [Line Items]                                              
Aggregate principal amount             74,000,000       74,000,000   92,000,000 $ 78,000,000 $ 79,000,000     $ 80,571,000     $ 49,321,000   $ 79,571,000
Unamortized debt offering costs             858,000       $ 858,000   1,107,000                    
Percentage of minimum commitments utilization requirement         80.00%                                    
Percentage of average daily unborrowed portion of financing commitments         0.50%                                    
Initial principal amount         $ 115,000,000                                    
Line of Credit Facility, Maximum Borrowing Capacity                   $ 215,000,000                          
Maturity date                     Dec. 18, 2023                        
Principal amount of borrowings             74,000,000       $ 74,000,000                        
Interest and fees expense             1,900,000 $ 1,200,000     5,500,000 $ 2,900,000                      
Long-term debt             73,142,000       73,142,000   $ 90,893,000                    
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility | Level III                                              
Debt Instrument [Line Items]                                              
Fair value of borrowings             73,100,000       $ 73,100,000                        
Unsecured Debt                                              
Debt Instrument [Line Items]                                              
Debt instrument, redemption price, percentage                     100.00%                        
2018-2 Secured Notes Class B-R Notes                                              
Debt Instrument [Line Items]                                              
Aggregate principal amount                                           18,300,000  
Stated Maturity                     Nov. 20, 2029 [2]   Nov. 20, 2029 [3]                    
Long-term debt             18,103,000       $ 18,103,000   $ 18,103,000                    
2018-2 Secured Notes Class A-1R-R Notes                                              
Debt Instrument [Line Items]                                              
Aggregate principal amount           $ 50,000,000                                  
Stated Maturity                     Nov. 20, 2029 [2]   Nov. 20, 2029 [3]                    
Long-term debt             16,200,000       $ 16,200,000   $ 25,671,000                    
Debt instrument converted amount           25,000,000                                  
Drew Amount $ 14,300,000                                            
Debt Instrument redemption, amount           $ 25,000,000                                  
Class A-R Notes                                              
Debt Instrument [Line Items]                                              
Percentage of aggregate amount of interest payable for first coverage test                   135.00%                          
Percentage of aggregate outstanding principal amount                     128.00%                        
Class A-R Notes and B-R Notes                                              
Debt Instrument [Line Items]                                              
Percentage of aggregate amount of interest payable for first coverage test                   125.00%                          
Percentage of aggregate outstanding principal amount                     118.20%                        
Class A-1R-R and Class A-1T-R Notes                                              
Debt Instrument [Line Items]                                              
Percentage of capitalization                     125.00%                        
4.875% Notes Due 2026                                              
Debt Instrument [Line Items]                                              
Debt instrument, issuance date                     Apr. 30, 2021                        
Debt discount   $ 2,430,000         1,346,000       $ 1,346,000   1,704,000                    
Debt offering costs   1,200,000                                          
Fair value of outstanding debt             106,000,000       106,000,000                        
Unamortized debt offering costs             628,000       628,000   818,000                    
Long-term debt             106,026,000       106,026,000   105,478,000                    
4.875% Notes Due 2026 | Unsecured Debt                                              
Debt Instrument [Line Items]                                              
Aggregate principal amount             108,000,000       $ 108,000,000   108,000,000 108,000,000 108,000,000     108,000,000          
Interest rate       4.875%                                      
Stated Maturity                     Apr. 30, 2026                        
Debt instrument, frequency of periodic payment                     semi-annually                        
Debt instrument, date of first required payment                     Sep. 16, 2021                        
4.875% Notes Due 2026 | Private Placement                                              
Debt Instrument [Line Items]                                              
Interest rate       4.875%                                      
4.875% Notes Due 2026 | Private Placement | Unsecured Debt                                              
Debt Instrument [Line Items]                                              
Aggregate principal amount   $ 28,000,000   $ 80,000,000                                      
Interest rate   4.875%   4.875%                                      
Proceeds from offering of notes   $ 27,400,000                                          
Proceeds from offering of notes       $ 77,700,000                                      
6.125% Notes Due 2022                                              
Debt Instrument [Line Items]                                              
Interest rate       6.125%           6.125%                          
Debt instrument, frequency of periodic payment                     quarterly                        
Debt offering costs       $ 2,900,000                                      
Debt Instrument redemption, amount       $ 77,400,000                                      
Debt instrument, redemption start date       Apr. 30, 2021                                      
Debt instrument, redemption end date       May 30, 2021                                      
Gain (Loss) on Extinguishment of Debt       $ 1,000,000                                      
6.125% Notes Due 2022 | Unsecured Debt                                              
Debt Instrument [Line Items]                                              
Aggregate principal amount                 $ 77,400,000                       76,726,000   $ 77,407,000
Interest rate                 6.125%                            
Proceeds from offering of notes                 $ 74,600,000                            
HCAP Notes                                              
Debt Instrument [Line Items]                                              
Aggregate principal amount     $ 28,750,000                                        
Interest rate     6.125%                                        
Stated Maturity     Sep. 15, 2022                                        
Debt Instrument redemption, amount                                     $ 28,750,000 $ 28,750,000      
2018-2 Secured Notes                                              
Debt Instrument [Line Items]                                              
Aggregate principal amount             139,493,000       $ 139,493,000   178,163,000 $ 147,672,000 $ 171,288,000     $ 163,863,000     $ 251,863,000 312,000,000  
Debt discount             855,000       855,000   1,226,000                    
Long-term debt             $ 138,638,000       $ 138,638,000   $ 176,937,000                    
Number of coverage tests | CoverageTest                     20                        
2018-2 Subordinated Notes                                              
Debt Instrument [Line Items]                                              
Aggregate principal amount                                           $ 108,000,000  
[1] Refer to Note 9 "Stockholders' Equity" for additional information on changes in components of Stockholders' Equity
[2] The indenture governing our CLO permits the repricing or refinancing of the secured notes after November 20, 2020, which may result in the redemption of the outstanding notes occurring prior to their stated maturity.
[3] The indenture governing our CLO permits the repricing or refinancing of the secured notes after November 20, 2020, which may result in the redemption of the outstanding notes occurring prior to their stated maturity.