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Borrowings - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 23, 2024
Apr. 29, 2024
Apr. 28, 2024
Nov. 18, 2022
Jun. 23, 2021
Apr. 30, 2021
Jul. 18, 2019
Jun. 30, 2024
 [1]
Mar. 31, 2021
Jun. 30, 2025
Jun. 30, 2024
 [1]
Dec. 31, 2024
Dec. 31, 2023
Mar. 31, 2025
Dec. 31, 2022
Jun. 30, 2022
Apr. 29, 2022
Apr. 28, 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                   6.00%   6.20%                      
Weighted average maturity on debt outstanding                   1 year 7 months 6 days   2 years 1 month 6 days                      
Principal amount of borrowings                   $ 146,306,000   $ 158,157,000                      
Gain (Loss) on Extinguishment of Debt               $ (39,000) $ 900,000 (0) $ (252,000)   $ (400,000)                    
GLPRF LLC                                              
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]                                              
Aggregate principal amount                   147,379,000   159,479,000 92,000,000 $ 147,379,000 $ 92,000,000       $ 80,571,000 $ 49,321,000   $ 79,571,000  
Unamortized debt offering costs                   1,073,000   1,322,000                      
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                   147,400,000   159,500,000                      
Fair value of borrowings, but not carried                   $ 148,100,000   160,300,000                      
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility | GLPRF LLC                                              
Debt Instrument [Line Items]                                              
Effective interest 2.50%                                            
Committed seven-day bridge advance in aggregate principal amount subject to satisfaction of certain conditions $ 18,250,000                                            
Maturity date Aug. 29, 2027                                            
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 $18,250,000, 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.                          
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility | GLPRF LLC | Non-call Period                                              
Debt Instrument [Line Items]                                              
Maturity date Apr. 29, 2025                                            
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility | GLPRF LLC | Maximum                                              
Debt Instrument [Line Items]                                              
Committed increase to aggregate principal amount not to exceed subject to satisfaction of certain 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]                                              
Aggregate principal amount                                         $ 18,300,000    
4.875% Notes due 2026                                              
Debt Instrument [Line Items]                                              
Debt instrument, issuance date                   Apr. 30, 2021                          
Debt discount         $ 2,400,000         $ 500,000   700,000                      
Debt offering costs         1,200,000                                    
Fair value of outstanding debt                   103,800,000   103,800,000                      
Unamortized debt offering costs                   200,000   300,000                      
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                          
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]                                              
Aggregate principal amount                   $ 0   0 125,683,000   $ 178,163,000       $ 163,863,000 $ 251,863,000 312,000,000    
Debt Instrument redemption, amount                 $ 88,000,000       $ 52,500,000                    
Debt Instrument redemption, amount                       125,700,000                      
Gain (Loss) on Extinguishment of Debt                       $ (700,000)                      
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 A-1 R-R Notes                                              
Debt Instrument [Line Items]                                              
Aggregate principal amount             $ 50,000,000                                
Debt instrument converted amount             25,000,000                                
Drew Amount       $ 14,300,000                                      
Debt Instrument redemption, amount             $ 25,000,000                                
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.