Derivative Financial Instruments and Concentrations of Credit Risk - Schedule of Gross Notional Value of Derivative Contracts (Detail) - Man-AHL Diversified Trading Company L.P. [Member] - USD ($)	Sep. 30, 2026	Dec. 31, 2025
Exchange-traded futures contracts [Member]
Derivatives, Fair Value [Line Items]
Notional value	$ 1,394,885,982	$ 1,972,977,407
Forward contracts [Member]
Derivatives, Fair Value [Line Items]
Notional value	1,066,882,067	892,459,991
Commodity forwards [Member]
Derivatives, Fair Value [Line Items]
Notional value	208	225
Swap agreements [Member]
Derivatives, Fair Value [Line Items]
Notional value	$ 357,218,500	$ 309,528,000

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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