v3.26.3
Derivative Financial Instruments and Concentrations of Credit Risk - Schedule of Derivative Contracts Traded or Settled During Period (Detail) - Man-AHL Diversified Trading Company L.P. [Member] - Contract
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Exchange-traded futures contracts [Member]        
Derivatives, Fair Value [Line Items]        
Exchange-traded futures contracts 16,688 19,766 57,850 71,153
Forward Contracts [Member]        
Derivatives, Fair Value [Line Items]        
Forward contracts 23,085 20,783 66,559 75,096
Swap Agreements [Member]        
Derivatives, Fair Value [Line Items]        
Swap agreements 282 260 685 807