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Investments, at Fair Value - Narrative (Details) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 27, 2022 USD ($) | Apr. 01, 2022 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) underlyingInvestment investmentFund | Dec. 31, 2022 USD ($) | Dec. 31, 2023 USD ($) underlyingInvestment investmentFund | Dec. 31, 2022 USD ($) | Aug. 01, 2023 USD ($) | Mar. 31, 2023 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |  |  |  |
Customer ExAlt Trusts loan payable, net |  |  |  |  |  |  | $ 56,700,000 |  |  |
Distribution proceeds |  |  |  |  |  |  | $ 38,371,000 | $ 45,350,000 |  |
Alternative investment funds | investmentFund |  |  |  |  | 247 |  | 247 |  |  |
Underlying investments | underlyingInvestment |  |  |  |  | 900 |  | 900 |  |  |
Percent of underlying investments in private companies |  |  |  |  | 89.00% |  | 89.00% |  |  |
Purchase of put options |  |  |  |  |  |  | $ 0 | 7,451,000 |  |
Notational amount of put options |  |  | $ 141,300,000 |  |  |  |  |  |  |
Proceeds from equity interest | [1] |  |  |  |  |  |  | 2,430,000 |  |
Proceeds from sale of put options by Ben |  |  |  | $ 1,000,000 |  |  | 968,000 | 0 |  |
Gain (loss) on investment |  |  |  |  | $ (18,024,000) | $ (23,043,000) | (64,260,000) | (56,101,000) |  |
Investments |  |  |  |  | 378,420,000 |  | 378,420,000 |  |  | $ 497,221,000
Noncredit-related portion of net unrealized losses |  |  |  |  | 51,000 | (1,307,000) | 4,236,000 | 6,400,000 |  |
Unrealized net gains | [2] |  |  |  |  |  | 13,694,000 |  |  |
Credit-related portion of other-than-temporary impairment on investment in debt securities |  |  |  |  | 0 | 0 | 0 | 12,600,000 |  |
Equity securities without readily determinable fair value |  |  |  |  | 64,500,000 |  | 64,500,000 |  |  | 21,600,000
Equity impairment loss |  |  |  |  | 0 | 0 | 0 | 0 |  |
Put options |  |  |  |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (loss) on investment |  |  |  | $ (700,000) | 0 | (3,825,000) | (3,023,000) | (1,081,000) |  |
Investments |  |  |  |  | 0 |  | 0 |  |  | 3,991,000
Ben |  |  |  |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |  |  |  |
Equity securities without readily determinable fair value |  |  |  |  | 38,000 |  | 38,000 |  |  | 0
Ben | Put options |  |  |  |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (loss) on investment |  |  |  |  |  | $ (2,800,000) | (2,000,000) | $ (800,000) |  |
CT Risk Management, L.L.C. |  |  |  |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase of put options |  |  | $ 5,000,000 |  |  |  |  |  |  |
Proceeds from equity interest |  | $ 2,400,000 |  |  |  |  |  |  |  |
Class A common stock, par value $0.001 per share | GWG Holdings |  |  |  |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of common stock |  |  |  |  |  |  |  |  |  | 3,700,000
Class A common stock, par value $0.001 per share | Other Public Companies |  |  |  |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of common stock |  |  |  |  | 4,200,000 |  | 4,200,000 |  |  | $ 8,800,000
Wind Down Trust | GWG Holdings |  |  |  |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of common stock |  |  |  |  | $ 3,800,000 |  | $ 3,800,000 |  | $ 17,400,000 |
[1] | Retroactively adjusted March 31, 2022 and the nine months ended December 31, 2022 for de-SPAC merger transaction as described in Note 4.
[2] | Retroactively adjusted March 31, 2023 for de-SPAC merger transaction as described in Note 4.

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