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Borrowings - Additional Information (Details) - USD ($)
 3 Months Ended 9 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
Sep. 30, 2024
Sep. 30, 2023
Mar. 31, 2021
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
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               6.70%     6.70%   7.00%                  
Weighted average maturity on debt outstanding                     2 years 4 months 24 days   3 years 8 months 12 days                  
Principal amount of borrowings               $ 158,126,000     $ 158,126,000   $ 91,225,000                  
Gain (Loss) on Extinguishment of Debt               (403,000) [1] $ (57,000) [1] $ 900,000 (655,000) [1] $ (275,000) [1] (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                                      
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               159,478,000     159,478,000   92,000,000 $ 92,000,000       $ 80,571,000 $ 49,321,000   $ 79,571,000  
Unamortized debt offering costs               1,352,000     1,352,000   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     159,500,000   $ 92,000,000                  
Fair value of borrowings, but not carried               160,300,000     $ 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    
Stated Maturity [2]                         Nov. 20, 2029                  
2018-2 Secured Notes Class A-1R-R Notes                                            
Debt Instrument [Line Items]                                            
Aggregate principal amount             $ 50,000,000                              
Stated Maturity [2]                         Nov. 20, 2029                  
Debt instrument converted amount             25,000,000                              
Drew Amount       $ 14,300,000                                    
Debt Instrument redemption, amount             $ 25,000,000                              
4.875% Notes due 2026                                            
Debt Instrument [Line Items]                                            
Debt instrument, issuance date                     Apr. 30, 2021                      
Debt discount         $ 2,400,000     800,000     $ 800,000   $ 1,200,000                  
Debt offering costs         1,200,000                                  
Fair value of outstanding debt               100,500,000     100,500,000   106,200,000                  
Unamortized debt offering costs               400,000     400,000   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       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%                      
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 discount                         712,000                  
Debt Instrument redemption, amount                   $ 88,000,000     $ 52,500,000                  
Debt Instrument redemption, amount               85,100,000 8,200,000   125,700,000 38,700,000                    
Gain (Loss) on Extinguishment of Debt               $ (400,000) $ 100,000   $ (700,000) $ 300,000                    
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.
[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.