Financial Highlights - Ratios to Average Partners' Capital and Other Information (Detail) - $ / shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Class A Series 1 [Member]
Per unit operating performance:
Beginning net asset value	$ 3,773.02	$ 3,379.30
Income (loss) from investment operations:
Net investment income (loss)	(38.23)	(28.38)
Net realized and change in unrealized gains (losses) on trading activities	376.39	40.38
Total income (loss) from investment operations	338.16	12.00
Ending net asset value	$ 4,111.18	$ 3,391.30
Ratios to average partners' capital:
Expenses other than incentive fees	5.46%	5.42%
Total expenses	5.46%	5.42%
Net investment income (loss)	(4.01%)	(3.42%)
Total return:
Total return before incentive fees	8.96%	0.36%
Total return after incentive fees	8.96%	0.36%
Class A Series 2 [Member]
Per unit operating performance:
Beginning net asset value	$ 4,317.43	$ 3,818.72
Income (loss) from investment operations:
Net investment income (loss)	(29.62)	(19.89)
Net realized and change in unrealized gains (losses) on trading activities	431.34	45.49
Total income (loss) from investment operations	401.72	25.60
Ending net asset value	$ 4,719.15	$ 3,844.32
Ratios to average partners' capital:
Expenses other than incentive fees	4.14%	4.08%
Total expenses	4.14%	4.08%
Net investment income (loss)	(2.71%)	(2.12%)
Total return:
Total return before incentive fees	9.30%	0.67%
Total return after incentive fees	9.30%	0.67%
Class B Series 1 [Member]
Per unit operating performance:
Beginning net asset value	$ 3,772.86	$ 3,379.15
Income (loss) from investment operations:
Net investment income (loss)	(38.33)	(28.27)
Net realized and change in unrealized gains (losses) on trading activities	376.47	40.27
Total income (loss) from investment operations	338.14	12.00
Ending net asset value	$ 4,111.00	$ 3,391.15
Ratios to average partners' capital:
Expenses other than incentive fees	5.47%	5.40%
Total expenses	5.47%	5.40%
Net investment income (loss)	(4.02%)	(3.40%)
Total return:
Total return before incentive fees	8.96%	0.36%
Total return after incentive fees	8.96%	0.36%
Man-AHL Diversified Trading Company L.P. [Member]
Per unit operating performance:
Beginning net asset value	$ 17,723.52	$ 15,203.61
Income (loss) from investment operations:
Net investment income (loss)	23.43	41.22
Net realized and change in unrealized gains (losses) on trading activities	1,773.25	183.67
Total income (loss) from investment operations	1,796.68	224.89
Ending net asset value	$ 19,520.20	$ 15,428.50
Ratios to average partners' capital:
Total expenses	0.92%	0.85%
Net investment income (loss)	0.52%	1.10%
Total return	10.14%	1.48%