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Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Man-AHL Diversified I L.P [Member]
Summary of Investment Holdings [Line Items]
Partnership owned units in Trading Company	1,729.78		1,729.78		1,984.83
Partnership's aggregate ownership percentage of the Trading Company	44.69%		44.69%		45.32%
Percentage of incentive fees charge by Advisor			20.00%
Incentive fees incurred during the period	$ 0	$ 0	$ 0	$ 0
Provision for income taxes			0	0
Tax expenses, including interest or penalties	0	0	$ 0	0
Man-AHL Diversified I L.P [Member] \| Limited Partnership Agreement [Member]
Summary of Investment Holdings [Line Items]
Percentage of Advisor monthly management fee			0.1667%
Percentage of Advisor management fee annually			2.00%
Man-AHL Diversified I L.P [Member] \| Net Asset Value of Class A Series 1 and Class B Series 1 Units [Member]
Summary of Investment Holdings [Line Items]
Percentage of monthly servicing fee to MII			0.0833%
Percentage of annually servicing fee to MII			1.00%
Man-AHL Diversified I L.P [Member] \| Net Asset Value of Class A Series 1 and Class B Series 1 Units [Member] \| General Partner [Member]
Summary of Investment Holdings [Line Items]
Percentage of Advisor monthly management fee			0.0833%
Percentage of Advisor management fee annually			1.00%
Man-AHL Diversified I L.P [Member] \| Net Asset Value of Class A Series 2 and Class B Series 2 Units [Member]
Summary of Investment Holdings [Line Items]
Percentage of monthly servicing fee to MII			0.0625%
Percentage of annually servicing fee to MII			0.75%
Man-AHL Diversified Trading Company L.P. [Member]
Summary of Investment Holdings [Line Items]
Provision for income taxes	0	0	$ 0	0
Tax expenses, including interest or penalties	0	$ 0	0	$ 0
Due to brokers	679,875		$ 679,875		$ 0
Cash and cash equivalents, maturity period			90 days or less
Foreign cash balances	15,495		$ 15,495		14
Foreign cash balance, cost	$ 13,682		$ 13,682		$ 12
Maturity period			90 days
Investment, Type [Extensible Enumeration]	US Treasury Bill Securities [Member]		US Treasury Bill Securities [Member]