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Financial Highlights (Tables)
 9 Months Ended
Sep. 30, 2017
Disclosure Text Block Supplement [Abstract]  
Financial Summary [Table Text Block]
The following financial highlights show the Trust’s financial performance of the Trading units by class for the three and nine month periods ended September 30, 2017, and 2016, respectively. Total return is calculated as the change in a theoretical beneficial owner’s investment over the entire period, and is not annualized. Total return is calculated based on the aggregate return of the Trust’s Trading units taken as a whole. No financial highlights per share operating performance has been presented for Class C units for the three and nine month periods ended September 30, 2017 and 2016, respectively, since all Class C units were purchased and fully redeemed in January 2015 and no further Class C units have been issued subsequently. As of September 30, 2017, no Class D units had been sold and, therefore, the Trust’s financial performance with respect to the class D units is not reflected below.

   
Class A
    
Class B
    
Class A
    
Class B
  
   
Three months ended
    
Three months ended
    
Nine months ended
    
Nine months ended
  
   
September 30,
    
September 30,
    
September 30,
    
September 30,
  
   
2017
    
2016
    
2017
    
2016
    
2017
    
2016
    
2017
    
2016
  
Per share operating performance:
                                                
    Net asset value of Trading units, beginning of period
  
$
44.25
    
$
59.93
    
$
52.46
    
$
69.65
    
$
49.35
    
$
58.09
    
$
57.94
    
$
66.84
  
    Total Trading income (loss):
                                                                
         Trading gain (loss)
    
(1.72
)
    
(1.31
)
    
(2.05
)
    
(1.53
)
    
(3.65
)
    
4.89
      
(4.33
)
    
5.62
  
         Investment income
    
0.09
      
0.04
      
0.11
      
0.04
      
0.20
      
0.11
      
0.23
      
0.12
  
         Expenses
    
(2.33
)
    
(1.98
)
    
(2.51
)
    
(1.96
)
    
(5.61
)
    
(6.41
)
    
(5.83
)
    
(6.38
)
    Trading loss
    
(3.96
)
    
(3.25
)
    
(4.45
)
    
(3.45
)
    
(9.06
)
    
(1.41
)
    
(9.93
)
    
(0.64
)
    Net asset value of Trading units, end of period
  
$
40.29
    
$
56.68
    
$
48.01
    
$
66.20
    
$
40.29
    
$
56.68
    
$
48.01
    
$
66.20
  
                                                                 
Total return:
                                                                
    Total return before incentive fees
    
(8.94
%)
    
(5.28
%)
    
(8.48
%)
    
(4.80
%)
    
(18.37
%)
    
(1.28
%)
    
(17.13
%)
    
0.20
%
    Less incentive fee allocations
    
0.00
%
    
(0.15
%)
    
0.00
%
    
(0.15
%)
    
0.00
%
    
(1.15
%)
    
0.00
%
    
(1.15
%)
Total return
    
(8.94
%)
    
(5.43
%)
    
(8.48
%)
    
(4.95
%)
    
(18.37
%)
    
(2.43
%)
    
(17.13
%)
    
(0.95
%)
                                                                 
Ratios to average net assets:
                                                                
    Trading loss
    
(9.19
%)
    
(5.48
%)
    
(8.76
%)
    
(5.03
%)
    
(19.55
%)
    
(1.86
%)
    
(19.08
%)
    
(0.44
%)
    Expenses:
                                                                
         Expenses, less incentive fees
    
(5.45
%)
    
(3.24
%)
    
(4.97
%)
    
(2.71
%)
    
(12.20
%)
    
(9.71
%)
    
(11.81
%)
    
(8.16
%)
         Incentive fees
    
0.00
%
    
(0.15
%)
    
0.00
%
    
(0.15
%)
    
0.00
%
    
(1.15
%)
    
0.00
%
    
(1.15
%)
    Total expenses
    
(5.45
%)
    
(3.39
%)
    
(4.97
%)
    
(2.86
%)
    
(12.20
%)
    
(10.86
%)
    
(11.81
%)
    
(9.31
%)