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Borrowings - Additional Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jul. 23, 2024
Nov. 18, 2022
Apr. 29, 2022
Apr. 28, 2022
Jun. 23, 2021
Apr. 30, 2021
Jul. 18, 2019
Mar. 31, 2021
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Dec. 31, 2020
Oct. 28, 2020
Dec. 31, 2019
Dec. 18, 2019
Debt Instrument [Line Items]                                  
Weighted average stated interest rate on debt outstanding                 6.20% 7.00%              
Weighted average maturity on debt outstanding                 2 years 1 month 6 days 3 years 8 months 12 days              
Principal amount of borrowings                 $ 158,157,000 $ 91,225,000              
Gain (Loss) on Extinguishment of Debt                 $ (655,000) $ (362,000)              
GLPRF LLC Member                                  
Debt Instrument [Line Items]                                  
Effective interest     2.80% 2.85%                          
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]     us-gaap:SecuredOvernightFinancingRateSofrMember us-gaap:SecuredOvernightFinancingRateSofrMember                          
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility                                  
Debt Instrument [Line Items]                                  
Weighted average stated interest rate on debt outstanding                 7.67% 7.84% 4.53%            
Aggregate principal amount                 $ 159,479,000 $ 92,000,000 $ 92,000,000   $ 80,571,000 $ 49,321,000   $ 79,571,000  
Unamortized debt offering costs                 1,322,000 775,000              
Percentage of minimum commitments utilization requirement 70.00%                                
Percentage of average daily unborrowed portion of financing commitments 0.55%                                
Initial principal amount                                 $ 115,000,000
Line of Credit Facility, Maximum Borrowing Capacity $ 200,000,000                     $ 215,000,000          
Principal amount of borrowings                 159,500,000                
Fair value of Revolving Credit Facility, but not carried                 $ 160,300,000 $ 91,200,000              
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility | GLPRF LLC Member                                  
Debt Instrument [Line Items]                                  
Spread 2.50%                                
Debt instrument amended agreement, description                 On July 23, 2024, GLPRF LLC amended the Revolving Credit Facility with JPM as administrative agent. The amended agreement, among other things, (i) provided for a committed increase to the aggregate principal amount of the Revolving Credit Facility in an amount not to exceed $85.0 million, for a total commitment of $200.0 million, which increase became effective on August 20, 2024, (ii) provided for a committed seven-day bridge advance in an aggregate principal amount of $18.3 million, which advance became effective on August 20, 2024, (iii) reduced the applicable margin on the Revolving Credit Facility to 2.50% per annum, (iv) extended the period in which the Company may request advances under the Revolving Credit Facility to August 29, 2026, (v) extended the stated maturity of the Revolving Credit Facility to August 29, 2027, (vi) reduced the requirement to utilize a minimum of commitments under the Revolving Credit Facility to 70%, (vii) reduced the non-usage fee applicable during the reinvestment period to 0.55% per annum on the average daily unborrowed portion of the financing commitments in excess of the minimum utilization amount, (viii) extended the non-call period under the Revolving Credit Facility to April 29, 2025, and (ix) provided for certain fees to be paid to the administrative agent and the lenders in connection therewith.                
Committed seven-day bridge advance in aggregate principal amount subject to satisfaction of certain conditions $ 18,300,000                                
Maturity date Aug. 29, 2027                                
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility | GLPRF LLC Member | Non-call Period                                  
Debt Instrument [Line Items]                                  
Maturity date Apr. 29, 2025                                
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility | Maximum | GLPRF LLC Member                                  
Debt Instrument [Line Items]                                  
Committed increase to aggregate principal amount not to exceed subject to satisfaction of certian conditions $ 85,000,000                                
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]                                  
Stated Maturity [1]                   Nov. 20, 2029              
Debt instrument outstanding amount                   $ 18,250,000              
2018-2 Secured Notes Class A-1R-R Notes                                  
Debt Instrument [Line Items]                                  
Stated Maturity [1]                   Nov. 20, 2029              
Debt instrument outstanding amount                   $ 12,922,000              
4.875% Notes due 2026                                  
Debt Instrument [Line Items]                                  
Debt instrument, issuance date                 Apr. 30, 2021                
Debt discount         $ 2,400,000       $ 700,000 1,200,000              
Debt offering costs         1,200,000                        
Fair value of outstanding debt                 103,800,000 106,200,000              
Unamortized debt offering costs                 300,000 600,000              
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        
Interest rate           4.875%                      
Stated Maturity                 Apr. 30, 2026                
Debt instrument, frequency of periodic payment                 semi-annually                
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%                
6.125% Notes Due 2022 | Unsecured Debt                                  
Debt Instrument [Line Items]                                  
Aggregate principal amount                           76,726,000   $ 77,407,000  
2018-2 Secured Notes                                  
Debt Instrument [Line Items]                                  
Weighted average stated interest rate on debt outstanding                 7.99% 7.35% 3.51%            
Aggregate principal amount                   $ 125,683,000 $ 178,163,000   $ 163,863,000 $ 251,863,000 $ 312,000,000    
Debt discount                 $ 0 712,000              
Fair value of outstanding debt                   125,000,000              
Debt instrument outstanding amount                 0                
Debt Instrument redemption, amount               $ 88,000,000 125,700,000 52,500,000              
Gain (Loss) on Extinguishment of Debt               $ 900,000 $ 700,000 $ 400,000              
2018-2 Secured Notes | CLO Facility | GARS Acquisition                                  
Debt Instrument [Line Items]                                  
Aggregate principal amount                             420,000,000    
Discount amortized over the remaining term                             2,400,000    
2018-2 Secured Notes | 2018-2 Secured Notes Class B-R Notes                                  
Debt Instrument [Line Items]                                  
Aggregate principal amount                             18,300,000    
2018-2 Secured Notes | 2018-2 Secured Notes Class A-1R-R Notes                                  
Debt Instrument [Line Items]                                  
Aggregate principal amount             $ 50,000,000                    
Drew Amount   $ 14,300,000                              
Unfunded Amount   $ 25,000,000                              
Debt Instrument redemption, amount             $ 25,000,000                    
2018-2 Subordinated Notes                                  
Debt Instrument [Line Items]                                  
Aggregate principal amount                             $ 108,000,000    
[1] 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.