Investments - Schedule of Certain Investments (Details) - USD ($) shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2026	Dec. 31, 2025
Net Investment Income [Line Items]
Investments in Two Sigma Funds, at fair value	$ 1,873,879	$ 1,587,658
TS Hamilton Fund
Net Investment Income [Line Items]
Investments in Two Sigma Funds, at fair value	$ 1,873,879	$ 1,587,658
BlackRock Liquidity Funds T-Fund Portfolio \| TS Hamilton Fund \| Long
Net Investment Income [Line Items]
Principal / Shares	155,787
Investments in Two Sigma Funds, at fair value	$ 155,787
BlackRock Liquidity Funds T-Fund Portfolio \| Members' Equity \| Investment Concentration Risk \| TS Hamilton Fund \| Long
Net Investment Income [Line Items]
% of Members’ Equity	5.90%
Invesco Treasury Portfolio Money Market Fund \| TS Hamilton Fund \| Long
Net Investment Income [Line Items]
Principal / Shares	167,517
Investments in Two Sigma Funds, at fair value	$ 167,517
Invesco Treasury Portfolio Money Market Fund \| Members' Equity \| Investment Concentration Risk \| TS Hamilton Fund \| Long
Net Investment Income [Line Items]
% of Members’ Equity	6.30%
U.S. Treasury Securities, 0.0000% - 5.1250%, due 10/1/2026 - 5/15/2056 \| TS Hamilton Fund \| Long
Net Investment Income [Line Items]
Principal / Shares	2,230,441
Investments in Two Sigma Funds, at fair value	$ 2,166,051
U.S. Treasury Securities, 0.0000% - 5.1250%, due 10/1/2026 - 5/15/2056 \| Members' Equity \| Investment Concentration Risk \| TS Hamilton Fund \| Long
Net Investment Income [Line Items]
% of Members’ Equity	81.60%
U.S. Treasury Securities, 3.5000% - 5.1250%, due 1/31/2027 - 8/15/2056 \| TS Hamilton Fund \| Short
Net Investment Income [Line Items]
Principal / Shares	201,398
Investments in Two Sigma Funds, at fair value	$ 190,608
U.S. Treasury Securities, 3.5000% - 5.1250%, due 1/31/2027 - 8/15/2056 \| Members' Equity \| Investment Concentration Risk \| TS Hamilton Fund \| Short
Net Investment Income [Line Items]
% of Members’ Equity	7.20%