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Investments - Schedule of Investments in Two Sigma Funds (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Marketable Securities [Line Items] |  |
Cost | $ 891,791 | $ 731,100
Investments in Two Sigma Funds, at fair value | 979,986 | 740,736
Two Sigma Funds |  |
Marketable Securities [Line Items] |  |
Net Unrealized Gains (Losses) | 88,195 | 9,636
Investments in Two Sigma Funds, at fair value | 979,986 | 740,736
Two Sigma Futures Portfolio, LLC (FTV) |  |
Marketable Securities [Line Items] |  |
Cost | 469,379 | 438,625
Net Unrealized Gains (Losses) | (7,212) | (95,213)
Investments in Two Sigma Funds, at fair value | 462,167 | 343,412
Two Sigma Spectrum Portfolio, LLC (STV) |  |
Marketable Securities [Line Items] |  |
Cost | 239,819 | 171,135
Net Unrealized Gains (Losses) | 54,115 | 57,982
Investments in Two Sigma Funds, at fair value | 293,934 | 229,117
Two Sigma Equity Spectrum Portfolio, LLC (ESTV) |  |
Marketable Securities [Line Items] |  |
Cost | 182,593 | 121,340
Net Unrealized Gains (Losses) | 41,292 | 46,867
Investments in Two Sigma Funds, at fair value | $ 223,885 | $ 168,207

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