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Borrowings - Additional Information (Details) - USD ($) |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |
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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.

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