Derivative Financial Instruments and Concentrations of Credit Risk - Schedule of Additional Disclosures Regarding Offsetting of Derivative Assets (Detail) - Man-AHL Diversified Trading Company L.P. [Member] - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Swap Agreements [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets	$ 22,562,739	$ 34,757,966
Gross Amount Offset in the Statements of Financial Condition, Asset	(19,446,010)	(26,937,452)
Net Amounts of Assets presented in the Statements of Financial Condition	3,116,729	7,820,514
Gross Amounts Not Offset in the Statements of Financial Condition, Financial Instruments, Asset	0	0
Gross Amounts Not Offset in the Statements of Financial Condition, Cash Collateral Received	0	0
Net Amount, Asset	3,116,729	7,820,514
Swap Agreements [Member] | Credit Suisse [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets	6,042	640,035
Gross Amount Offset in the Statements of Financial Condition, Asset	(6,042)	0
Net Amounts of Assets presented in the Statements of Financial Condition	0	640,035
Gross Amounts Not Offset in the Statements of Financial Condition, Financial Instruments, Asset	0	0
Gross Amounts Not Offset in the Statements of Financial Condition, Cash Collateral Received	0	0
Net Amount, Asset	0	640,035
Swap Agreements [Member] | Deutsche Bank [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets		3,464,513
Gross Amount Offset in the Statements of Financial Condition, Asset		(2,877,261)
Net Amounts of Assets presented in the Statements of Financial Condition		587,252
Gross Amounts Not Offset in the Statements of Financial Condition, Financial Instruments, Asset		0
Gross Amounts Not Offset in the Statements of Financial Condition, Cash Collateral Received		0
Net Amount, Asset		587,252
Swap Agreements [Member] | JPMorgan Chase [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets	22,554,737	30,414,760
Gross Amount Offset in the Statements of Financial Condition, Asset	(19,438,008)	(24,060,191)
Net Amounts of Assets presented in the Statements of Financial Condition	3,116,729	6,354,569
Gross Amounts Not Offset in the Statements of Financial Condition, Financial Instruments, Asset	0	0
Gross Amounts Not Offset in the Statements of Financial Condition, Cash Collateral Received	0	0
Net Amount, Asset	3,116,729	6,354,569
Swap Agreements [Member] | Goldman Sachs [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets	1,960	238,658
Gross Amount Offset in the Statements of Financial Condition, Asset	(1,960)	0
Net Amounts of Assets presented in the Statements of Financial Condition	0	238,658
Gross Amounts Not Offset in the Statements of Financial Condition, Financial Instruments, Asset	0	0
Gross Amounts Not Offset in the Statements of Financial Condition, Cash Collateral Received	0	0
Net Amount, Asset	0	238,658
Forward Contracts [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets	27,289,257	13,200,938
Gross Amount Offset in the Statements of Financial Condition, Asset	(23,344,943)	(12,744,510)
Net Amounts of Assets presented in the Statements of Financial Condition	3,944,314	456,428
Gross Amounts Not Offset in the Statements of Financial Condition, Financial Instruments, Asset	0	0
Gross Amounts Not Offset in the Statements of Financial Condition, Cash Collateral Received	0	0
Net Amount, Asset	3,944,314	456,428
Forward Contracts [Member] | Deutsche Bank [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets	4,263,914	1,704,868
Gross Amount Offset in the Statements of Financial Condition, Asset	(3,795,583)	(1,704,868)
Net Amounts of Assets presented in the Statements of Financial Condition	468,331	0
Gross Amounts Not Offset in the Statements of Financial Condition, Financial Instruments, Asset	0	0
Gross Amounts Not Offset in the Statements of Financial Condition, Cash Collateral Received	0	0
Net Amount, Asset	468,331	0
Forward Contracts [Member] | JPMorgan Chase [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets	869,145	8,263
Gross Amount Offset in the Statements of Financial Condition, Asset	(9,189)	(8,263)
Net Amounts of Assets presented in the Statements of Financial Condition	859,956	0
Gross Amounts Not Offset in the Statements of Financial Condition, Financial Instruments, Asset	0	0
Gross Amounts Not Offset in the Statements of Financial Condition, Cash Collateral Received	0	0
Net Amount, Asset	859,956	0
Forward Contracts [Member] | HSBC [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets	12,690,937	6,089,855
Gross Amount Offset in the Statements of Financial Condition, Asset	(10,851,225)	(6,089,855)
Net Amounts of Assets presented in the Statements of Financial Condition	1,839,712	0
Gross Amounts Not Offset in the Statements of Financial Condition, Financial Instruments, Asset	0	0
Gross Amounts Not Offset in the Statements of Financial Condition, Cash Collateral Received	0	0
Net Amount, Asset	1,839,712	0
Forward Contracts [Member] | Royal Bank of Scotland [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets	9,465,261	5,397,952
Gross Amount Offset in the Statements of Financial Condition, Asset	(8,688,946)	(4,941,524)
Net Amounts of Assets presented in the Statements of Financial Condition	776,315	456,428
Gross Amounts Not Offset in the Statements of Financial Condition, Financial Instruments, Asset	0	0
Gross Amounts Not Offset in the Statements of Financial Condition, Cash Collateral Received	0	0
Net Amount, Asset	776,315	456,428
Futures Contracts [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets	5,769,349	4,995,338
Gross Amount Offset in the Statements of Financial Condition, Asset	(2,380,496)	(1,827,864)
Net Amounts of Assets presented in the Statements of Financial Condition	3,388,853	3,167,474
Gross Amounts Not Offset in the Statements of Financial Condition, Financial Instruments, Asset	0	0
Gross Amounts Not Offset in the Statements of Financial Condition, Cash Collateral Received	0	0
Net Amount, Asset	3,388,853	3,167,474
Futures Contracts [Member] | Credit Suisse [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets	467,195	718,032
Gross Amount Offset in the Statements of Financial Condition, Asset	(461,778)	(697,088)
Net Amounts of Assets presented in the Statements of Financial Condition	5,417	20,944
Gross Amounts Not Offset in the Statements of Financial Condition, Financial Instruments, Asset	0	0
Gross Amounts Not Offset in the Statements of Financial Condition, Cash Collateral Received	0	0
Net Amount, Asset	5,417	20,944
Futures Contracts [Member] | JPMorgan Chase [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets	1,565,019	2,002,511
Gross Amount Offset in the Statements of Financial Condition, Asset	(398,525)	(501,233)
Net Amounts of Assets presented in the Statements of Financial Condition	1,166,494	1,501,278
Gross Amounts Not Offset in the Statements of Financial Condition, Financial Instruments, Asset	0	0
Gross Amounts Not Offset in the Statements of Financial Condition, Cash Collateral Received	0	0
Net Amount, Asset	1,166,494	1,501,278
Futures Contracts [Member] | Bank of America Merrill Lynch [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets	3,737,135	2,274,795
Gross Amount Offset in the Statements of Financial Condition, Asset	(1,520,193)	(629,543)
Net Amounts of Assets presented in the Statements of Financial Condition	2,216,942	1,645,252
Gross Amounts Not Offset in the Statements of Financial Condition, Financial Instruments, Asset	0	0
Gross Amounts Not Offset in the Statements of Financial Condition, Cash Collateral Received	0	0
Net Amount, Asset	$ 2,216,942	$ 1,645,252