v3.26.3
Financial Highlights - Ratios to Average Partners' Capital and Other Information (Detail) - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Man-AHL Diversified I L.P [Member] | Class A Series 1 [Member]        
Investment Company, Financial Highlights [Roll Forward]        
Beginning net asset value $ 5,742.95 $ 4,161.92 $ 5,134.05 $ 4,868.88
Income/(loss) from investment operations:        
Net investment income (loss) (37.37) (26.8) (98.38) (60.01)
Net realized gains/(losses) and change in unrealized appreciation/(depreciation) on trading activities and translation of foreign currency 457.58 514.91 1,127.49 (158.84)
Total income (loss) from investment operations 420.21 488.11 1,029.11 (218.85)
Ending net asset value $ 6,163.16 $ 4,650.03 $ 6,163.16 $ 4,650.03
Ratios to average limited partners' capital:        
Total expenses excluding incentive fees 6.13% 6.21% 5.88% 5.70%
Total expenses including incentive fees 6.13% 6.21% 5.88% 5.70%
Net investment income (loss) (2.54%) (2.50%) (2.30%) (1.82%)
Total return:        
Total return before incentive fees 7.32% 11.73% 20.04% (4.49%)
Total return after incentive fees 7.32% 11.73% 20.04% (4.49%)
Man-AHL Diversified I L.P [Member] | Class A Series 2 [Member]        
Investment Company, Financial Highlights [Roll Forward]        
Beginning net asset value $ 7,129.45 $ 5,102.36 $ 6,333.74 $ 5,931.78
Income/(loss) from investment operations:        
Net investment income (loss) (23.37) (17.09) (54.12) (25.4)
Net realized gains/(losses) and change in unrealized appreciation/(depreciation) on trading activities and translation of foreign currency 569.05 633.36 1,395.51 (187.75)
Total income (loss) from investment operations 545.68 616.27 1,341.39 (213.15)
Ending net asset value $ 7,675.13 $ 5,718.63 $ 7,675.13 $ 5,718.63
Ratios to average limited partners' capital:        
Total expenses excluding incentive fees 4.87% 5.12% 4.56% 4.56%
Total expenses including incentive fees 4.87% 5.12% 4.56% 4.56%
Net investment income (loss) (1.28%) (1.30%) (1.02%) (0.63%)
Total return:        
Total return before incentive fees 7.65% 12.08% 21.18% (3.59%)
Total return after incentive fees 7.65% 12.08% 21.18% (3.59%)
Man-AHL Diversified I L.P [Member] | Class B Series 1 [Member]        
Investment Company, Financial Highlights [Roll Forward]        
Beginning net asset value $ 5,742.69 $ 4,161.75 $ 5,133.83 $ 4,868.67
Income/(loss) from investment operations:        
Net investment income (loss) (37.38) (27.26) (98.32) (60.93)
Net realized gains/(losses) and change in unrealized appreciation/(depreciation) on trading activities and translation of foreign currency 457.58 515.33 1,127.38 (157.92)
Total income (loss) from investment operations 420.2 488.07 1,029.06 (218.85)
Ending net asset value $ 6,162.89 $ 4,649.82 $ 6,162.89 $ 4,649.82
Ratios to average limited partners' capital:        
Total expenses excluding incentive fees 6.13% 6.31% 5.87% 5.78%
Total expenses including incentive fees 6.13% 6.31% 5.87% 5.78%
Net investment income (loss) (2.54%) (2.55%) (2.30%) (1.85%)
Total return:        
Total return before incentive fees 7.32% 11.73% 20.04% (4.50%)
Total return after incentive fees 7.32% 11.73% 20.04% (4.50%)
Man-AHL Diversified Trading Company L.P. [Member]        
Investment Company, Financial Highlights [Roll Forward]        
Beginning net asset value $ 36,495.89 $ 25,123.99 $ 31,843.46 $ 28,670.91
Income/(loss) from investment operations:        
Net investment income (loss) 271.15 233.24 779.05 651.13
Net realized gains/(losses) and change in unrealized appreciation/(depreciation) on trading activities and translation of foreign currency 2,916.12 3,118.6 7,060.65 (846.21)
Total income (loss) from investment operations 3,187.27 3,351.84 7,839.7 (195.08)
Ending net asset value $ 39,683.16 $ 28,475.83 $ 39,683.16 $ 28,475.83
Ratios to average limited partners' capital:        
Total expenses excluding incentive fees 0.70% 0.17% 0.68% 0.61%
Net investment income (loss) 2.89% 3.59% 2.88% 3.30%
Total return:        
Total return before incentive fees 8.73% 13.34% 24.62% (0.68%)