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 Unit Performance (for a unit outstanding throughout the year):      
Net asset value per Unit, beginning of year $ 29.69    
Net asset value per Unit, end of year 29.04 $ 29.69  
Class Z [Member]      
Per Unit Performance (for a unit outstanding throughout the year):      
Net asset value per Unit, beginning of year 12.93    
Net asset value per Unit, end of year 12.74 12.93  
Limited Partner [Member] | Class A [Member]      
Per Unit Performance (for a unit outstanding throughout the year):      
Net realized and unrealized gains (losses) [1] (0.66) 1.56 $ (0.21)
Net investment income [1] 0.01 0.06 0.2
Increase (decrease) for the year [1] (0.65) 1.62 (0.01)
Net asset value per Unit, beginning of year [1] 29.69 28.07 28.08
Net asset value per Unit, end of year [1] $ 29.04 $ 29.69 $ 28.07
Ratios to Average Limited Partners' Capital:      
Net investment income [3] 0.00% [2] 0.20% 0.70%
Operating expenses 3.50% 3.50% 3.40%
Incentive fees 0.00% 0.70% 0.10%
Total expenses 3.50% 4.20% 3.50%
Total return:      
Total return before incentive fees (2.20%) 6.50% 0.10%
Incentive fees 0.00% (0.70%) (0.10%)
Total return after incentive fees (2.20%) 5.80% 0.00%
Limited Partner [Member] | Class Z [Member]      
Per Unit Performance (for a unit outstanding throughout the year):      
Net realized and unrealized gains (losses) [1] $ (0.29) $ 0.67 $ (0.09)
Net investment income [1] 0.1 0.13 0.18
Increase (decrease) for the year [1] (0.19) 0.8 0.09
Net asset value per Unit, beginning of year [1] 12.93 12.13 12.04
Net asset value per Unit, end of year [1] $ 12.74 $ 12.93 $ 12.13
Ratios to Average Limited Partners' Capital:      
Net investment income [3] 0.80% 1.00% 1.40%
Operating expenses 2.70% 2.70% 2.60%
Incentive fees 0.00% 0.70% 0.10%
Total expenses 2.70% 3.40% 2.70%
Total return:      
Total return before incentive fees (1.50%) 7.30% 0.90%
Incentive fees 0.00% (0.70%) (0.20%)
Total return after incentive fees (1.50%) 6.60% 0.70%
[1] Net investment income (loss) per Unit is calculated by dividing the interest income less total expenses by the average number of Units outstanding during the year. The net realized and unrealized gains (losses) per Unit is a balancing amount necessary to reconcile the change in net asset value per Unit with the other per unit information.
[2] Due to rounding.
[3] Interest income less total expenses.