Derivative Financial Instruments and Concentrations of Credit Risk - Additional Amounts of Collateral Pledged (Detail) - Man-AHL Diversified Trading Company L.P. [Member] - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Forward Contracts [Member] | Deutsche Bank [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Additional Collateral Pledged		$ 2,055,802
Forward Contracts [Member] | HSBC [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Additional Collateral Pledged		$ 2,976,528
Swap Agreements [Member] | Credit Suisse [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Additional Collateral Pledged	$ 1,947,455
Swap Agreements [Member] | Goldman Sachs [Member]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Additional Collateral Pledged	$ 2,172,498