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Investments - Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2022 USD ($) Member | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jan. 31, 2021 USD ($)
Investment Holdings [Line Items] |  |  |  |  |  |
CLO fund securities percentage of total assets |  |  | 3.30% | 4.90% |  |
Non qualified assets percentage of total assets |  |  | 17.60% | 15.80% |  |
Joint ventures percentage of total assets |  |  | 9.50% | 9.30% |  |
Fair Value |  |  | $ 576,478 | $ 549,985 |  |
Unfunded commitment to investee |  |  | 34,959 | 47,899 |  |
Middle-market Loans |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Purchase (sale) of middle-market loans |  | $ 147,000 |  |  |  |
Great Lakes KCAP F3C Senior, LLC |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Percentage of subordinated notes purchased | 100.00% |  |  |  |  |
Cash distribution received for refinancing | $ 12,600 |  |  |  |  |
Distribution on return of capital | $ 11,800 |  |  |  |  |
Great Lakes KCAP F3C Senior, LLC | Middle-market Loans |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Purchase (sale) of middle-market loans |  | 184,000 |  |  |  |
Catamaran 2016-1 |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Notional amount sold |  |  |  |  |  | $ 10,100
Notional amount of subordinated notes |  |  |  |  |  | $ 3,300
Level II |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Fair Value |  |  | $ 65,000 | 42,900 |  |
Non Qualifying Assets |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Investment portfolio percentage |  |  | 30.00% |  |  |
Joint venture |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Investment income from investments in joint ventures |  |  | $ 8,600 | 9,200 | $ 6,900 |
Aggregate fair value of investments in joint venture |  |  | $ 59,000 | 60,500 |  |
F3C Joint Venture |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Amount contributed in assets of Joint venture |  | 37,000 |  |  |  |
F3C Joint venture ownership percentage |  |  | 62.80% |  |  |
Number of board of directors | Member |  |  | 4 |  |  |
Directors selected by company | Member |  |  | 2 |  |  |
Directors selected by Freedom 3 Opportunities | Member |  |  | 2 |  |  |
BCP Great Lakes Partnership LP |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Fair Value |  |  | $ 40,300 | 37,400 |  |
Series A-Great Lakes Funding II LLC |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Percentage of voting interest |  |  | 50.00% |  |  |
Fair Value |  |  | $ 40,300 | 37,400 |  |
Increase in aggregate commitment to investee |  |  | 50,000 |  |  |
Unfunded commitment to investee |  |  | $ 8,000 | $ 13,000 |  |
Freedom 3 Opportunities | F3C Joint Venture |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Amount contributed in assets of Joint venture |  | $ 25,000 |  |  |  |

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