Derivative Financial Instruments and Concentrations of Credit Risk - Schedule of Fair Value of Trading Company's Derivative Instruments and Net Presentation on Statements of Financial Condition Location (Detail) - Man-AHL Diversified Trading Company L.P. [Member] - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	$ 55,621,345	$ 52,954,242
Liability Derivatives, Fair Value	(45,379,231)	(44,079,410)
Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	27,289,257	13,200,938
Liability Derivatives, Fair Value	(23,344,943)	(15,314,094)
Forward Contracts [Member] | Currencies [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	26,420,112	13,192,268
Liability Derivatives, Fair Value	(23,335,754)	(15,084,071)
Forward Contracts [Member] | Metals [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	869,145	8,670
Liability Derivatives, Fair Value	(9,189)	(230,023)
Futures Contracts [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	5,769,349	4,995,338
Liability Derivatives, Fair Value	(2,380,496)	(1,827,864)
Futures Contracts [Member] | Currencies [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	0	0
Liability Derivatives, Fair Value	(11,326)	(16,585)
Futures Contracts [Member] | Metals [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	519,022	768,016
Liability Derivatives, Fair Value	(42,955)	(1,275)
Futures Contracts [Member] | Agricultural [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	780,701	625,956
Liability Derivatives, Fair Value	(221,788)	(731,073)
Futures Contracts [Member] | Energy [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	1,808,645	1,478,135
Liability Derivatives, Fair Value	(237,918)	(148,748)
Futures Contracts [Member] | Indices [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	1,162,256	1,681,749
Liability Derivatives, Fair Value	(1,720,186)	(557,670)
Futures Contracts [Member] | Interest Rates [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	1,498,725	441,482
Liability Derivatives, Fair Value	(146,323)	(372,513)
Swap Agreements [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	22,562,739	34,757,966
Liability Derivatives, Fair Value	(19,653,792)	(26,937,452)
Swap Agreements [Member] | Credit Default Swaps [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	82,458	2,500,929
Liability Derivatives, Fair Value	(215,784)	0
Swap Agreements [Member] | Interest Rates [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	22,480,281	32,257,037
Liability Derivatives, Fair Value	$ (19,438,008)	$ (26,937,452)