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Financial Highlights
9 Months Ended
Sep. 30, 2011
Financial Heights [Abstract] 
Financial Highlights
2.  
Financial Highlights
Changes in the net asset value per Unit for the three and nine months ended September 30, 2011 and 2010 were as follows:
 
                                                                                                       For the Three Months                                                                     For the Nine Months
                                                                                                            Ended September 30,                                                                       Ended September 30,

 
         2011
        2010
2011
2010                               
         Per Unit operating performance:
       
         Net asset value at the beginning of the period:
                 $   9.88
                   $   9.20
   $     10.59
$      9.79
         
                     Interest Income
–     (3)
–     (3)
–     (3)                                          
        0.01
                     Expenses
   (0.21)
  (0.20)
          (0.63)
       (0.61)
                     Realized/Unrealized Gain (1)
   0.52
   0.91
           0.23
        0.72
                     Net Gain (Loss)
       0.31
       0.71
          (0.40)
        0.12
         
         Net asset value, September 30:
$  10.19
    $   9.91
  $     10.19
$      9.91
         
         Ratios to average net assets:
       
                     Net Investment Loss  (2)
(7.9)%
(8.4)%
      (8.2)%
      (8.7)%
                     Expenses before Incentive Fees (2)
8.0%
8.5%
       8.2%
       8.8%
                     Expenses after Incentive Fees (2)
8.0%
8.5%
       8.2%
       8.8%
                     Net Gain/(Loss) (2)
12.9%
29.9%
      (5.0)%
       0.5%
         Total return before incentive fees
3.1%
7.7%
      (3.8)%
       1.2%
         Total return after incentive fees
3.1%
7.7%
      (3.8)%
       1.2%

   (1) Realized/Unrealized Gain is a balancing amount necessary to reconcile the change in net asset value per Unit
       with the other per Unit information.
   (2) Annualized (except for incentive fees, if applicable).

   (3) Amounts less than $0.005 per Unit.