Derivative Financial Instruments and Concentrations of Credit Risk - Schedule of Fair Value of Trading Company's Derivative Instruments (Detail) - Man-AHL Diversified Trading Company L.P. [Member] - USD ($)	Sep. 30, 2026	Dec. 31, 2025
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	$ 14,420,700	$ 14,225,272
Liability Derivatives, Fair Value	(10,018,957)	(5,155,643)
Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	7,792,558	8,468,234
Liability Derivatives, Fair Value	(7,021,360)	(3,569,661)
Forward Contracts [Member] \| Currencies [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	7,251,092	6,911,154
Liability Derivatives, Fair Value	(6,463,740)	(3,489,653)
Forward Contracts [Member] \| Metals [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	541,466	1,557,080
Liability Derivatives, Fair Value	(557,620)	(80,008)
Futures Contracts [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	6,578,870	5,408,798
Liability Derivatives, Fair Value	(2,327,610)	(1,585,982)
Futures Contracts [Member] \| Currencies [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	266,523	0
Liability Derivatives, Fair Value	0	(6,157)
Futures Contracts [Member] \| Metals [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	42,950	1,443,756
Liability Derivatives, Fair Value	(184,635)	0
Futures Contracts [Member] \| Agricultural [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	683,366	1,210,182
Liability Derivatives, Fair Value	(1,065,137)	(639,874)
Futures Contracts [Member] \| Energy [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	980,704	462,866
Liability Derivatives, Fair Value	(303,958)	(257,484)
Futures Contracts [Member] \| Indices [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	577,227	1,372,584
Liability Derivatives, Fair Value	(665,510)	(317,730)
Futures Contracts [Member] \| Interest Rates [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	4,028,100	919,410
Liability Derivatives, Fair Value	(108,370)	(364,737)
Swap Agreements [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	49,272	348,240
Liability Derivatives, Fair Value	(669,987)	0
Swap Agreements [Member] \| Credit Default Swaps [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	49,272	348,240
Liability Derivatives, Fair Value	$ (669,987)	$ 0

Derivative Financial Instruments and Concentrations of Credit Risk - Schedule of Fair Value of Trading Company's Derivative Instruments (Detail) - Man-AHL Diversified Trading Company L.P. [Member] - USD ($)