v3.26.1
Financial Highlights - Financial Highlights for Limited Partner Class (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Class A [Member]      
Per Redeemable Unit Performance (for a unit outstanding throughout the year):      
Net asset value per Redeemable Unit, beginning of year $ 2,627.2 $ 2,730.63  
Net asset value per Redeemable Unit, end of year 2,553.98 2,627.2 $ 2,730.63
Class D [Member]      
Per Redeemable Unit Performance (for a unit outstanding throughout the year):      
Net asset value per Redeemable Unit, beginning of year 2,083.28 2,165.3  
Net asset value per Redeemable Unit, end of year 2,025.22 2,083.28 2,165.3
Class Z [Member]      
Per Redeemable Unit Performance (for a unit outstanding throughout the year):      
Net asset value per Redeemable Unit, beginning of year 2,187.95 2,256.96  
Net asset value per Redeemable Unit, end of year 2,143.05 2,187.95 2,256.96
Limited Partners [Member] | Class A [Member]      
Per Redeemable Unit Performance (for a unit outstanding throughout the year):      
Net realized and unrealized gains (losses) [1] (54.95) (109.05) (4.8)
Net investment income (loss) [1] (18.27) 5.62 13.66
Increase (decrease) for the year [1] (73.22) (103.43) 8.86
Net asset value per Redeemable Unit, beginning of year [1] 2,627.2 2,730.63 2,721.77
Net asset value per Redeemable Unit, end of year [1] $ 2,553.98 $ 2,627.2 $ 2,730.63
Ratios to Average Limited Partners' Capital:      
Net investment income (loss) [2] (0.70%) 0.20% 0.50%
Operating expenses [2] 4.50% 4.00% 3.60%
Incentive fees [2] 0.00% 0.50% 0.30%
Total expenses [2] 4.50% 4.50% 3.90%
Total return:      
Incentive fees [2] 0.00% (0.50%) (0.30%)
Limited Partners [Member] | Class D [Member]      
Per Redeemable Unit Performance (for a unit outstanding throughout the year):      
Net realized and unrealized gains (losses) [1] $ (43.54) $ (86.7) $ 7.24
Net investment income (loss) [1] (14.52) 4.68 (0.26)
Increase (decrease) for the year [1] (58.06) (82.02) 6.98
Net asset value per Redeemable Unit, beginning of year [1] 2,083.28 2,165.3 2,158.32
Net asset value per Redeemable Unit, end of year [1] $ 2,025.22 $ 2,083.28 $ 2,165.3
Ratios to Average Limited Partners' Capital:      
Net investment income (loss) [2] (0.70%) 0.20% 0.00%
Operating expenses [2] 4.40% 3.90% 3.80%
Incentive fees [2] 0.00% 0.50% 0.80%
Total expenses [2] 4.40% 4.40% 4.60%
Total return:      
Incentive fees [2] 0.00% (0.50%) (0.80%)
Limited Partners [Member] | Class Z [Member]      
Per Redeemable Unit Performance (for a unit outstanding throughout the year):      
Net realized and unrealized gains (losses) [1] $ (46.1) $ (91.26) $ 0.02
Net investment income (loss) [1] 1.2 22.25 24.22
Increase (decrease) for the year [1] (44.9) (69.01) 24.24
Net asset value per Redeemable Unit, beginning of year [1] 2,187.95 2,256.96 2,232.72
Net asset value per Redeemable Unit, end of year [1] $ 2,143.05 $ 2,187.95 $ 2,256.96
Ratios to Average Limited Partners' Capital:      
Net investment income (loss) [2] 0.10% 1.10% 0.90%
Operating expenses [2] 3.70% 3.30% 2.90%
Incentive fees [2] 0.00% 0.40% 0.60%
Total expenses [2] 3.70% 3.70% 3.50%
Total return:      
Incentive fees [2] 0.00% (0.40%) (0.60%)
Total Return [Member] | Class A [Member]      
Ratios to Average Limited Partners' Capital:      
Incentive fees [2] 0.00% 0.50% 0.40%
Total return:      
Total return before incentive fees [2] (2.80%) (3.30%) 0.70%
Incentive fees [2] 0.00% (0.50%) (0.40%)
Total return after incentive fees [2] (2.80%) (3.80%) 0.30%
Total Return [Member] | Class D [Member]      
Ratios to Average Limited Partners' Capital:      
Incentive fees [2] 0.00% 0.50% 0.70%
Total return:      
Total return before incentive fees [2] (2.80%) (3.30%) 1.00%
Incentive fees [2] 0.00% (0.50%) (0.70%)
Total return after incentive fees [2] (2.80%) (3.80%) 0.30%
Total Return [Member] | Class Z [Member]      
Ratios to Average Limited Partners' Capital:      
Incentive fees [2] 0.00% 0.50% 0.50%
Total return:      
Total return before incentive fees [2] (2.10%) (2.60%) 1.60%
Incentive fees [2] 0.00% (0.50%) (0.50%)
Total return after incentive fees [2] (2.10%) (3.10%) 1.10%
[1] Net investment income (loss) per Redeemable Unit is calculated by dividing the interest income less total expenses by the average number of Redeemable Units outstanding during the period/year. The net realized and unrealized gains (losses) per Redeemable Unit is a balancing amount necessary to reconcile the change in net asset value per Redeemable Unit with the other per unit information.
[2] Interest income less total expenses.