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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