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Derivative Instruments and Hedging Activities (Tables)
 9 Months Ended
Sep. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Derivatives not designated as hedging instruments:

As of September 30, 2016
              
   
Asset
    
Liability
        
Type of
  
Derivatives
    
Derivatives
    
Net
  
Futures Contracts
  
Fair Value
    
Fair Value
    
Fair Value
  
                   
Agriculture
  
$
156,017
    
$
(46,445
)
  
$
109,572
  
Currency
    
38,761
      
(12,351
)
    
26,410
  
Energy
    
57,186
      
(52,599
)
    
4,587
  
Indices
    
33,695
      
(13,653
)
    
20,042
  
Interest rates
    
30,041
      
(15,745
)
    
14,296
  
Metals
    
11,901
      
(24,376
)
    
(12,475
)
   
$
327,601
    
$
(165,169
)
  
$
162,432
  
                         
As of December 31, 2015
                  
   
Asset
    
Liability
          
Type of
  
Derivatives
    
Derivatives
    
Net
  
Futures Contracts
  
Fair Value
    
Fair Value
    
Fair Value
  
                         
Agriculture
  
$
32,649
    
$
(61,049
)
  
$
(28,400
)
Currency
    
26,412
      
(863
)
    
25,549
  
Energy
    
104,889
      
(74,035
)
    
30,854
  
Indices
    
5,225
      
(23,774
)
    
(18,549
)
Interest rates
    
4,782
      
(21,653
)
    
(16,871
)
Metals
    
11,985
      
(9,213
)
    
2,772
  
   
$
185,942
    
$
(190,587
)
  
$
(4,645
)
Schedule of Derivative Instruments Included in Trading Activities [Table Text Block] Trading gain (loss) for the following periods:

   
Nine Months Ended September 30,
  
Type of Futures Contracts
  
2016
    
2015
  
Agriculture
  
$
222,679
    
$
(109,355
)
Currency
    
(14,698
)
    
(443,817
)
Energy
    
(66,462
)
    
149,498
  
Indices
    
115,184
      
(112,781
)
Interest rates
    
334,005
      
204,790
  
Metals
    
(23,315
)
    
(165,505
)
   
$
567,393
    
$
(477,170
)
   
Three Months Ended September 30,
  
Type of Futures Contracts
    
2016
      
2015
  
Agriculture
  
$
88,163
    
$
(91,186
)
Currency
    
(78,068
)
    
(145,463
)
Energy
    
(1,999
)
    
204,334
  
Indices
    
124,288
      
(93,326
)
Interest rates
    
(207,307
)
    
97,326
  
Metals
    
(51,916
)
    
(10,263
)
   
$
(126,839
)
  
$
(38,578
)