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FINANCIAL HIGHLIGHTS (Per Unit Performance Data and Other Supplemental Financial Data) (Details) - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Per Share Operating Performance:      
Net asset value, beginning of year [2],[3] $ 37.18 [1] $ 34.76 $ 58.50
Total income (loss) (13.49) 2.77 [2] (23.12) [2]
Total expenses (0.35) (0.35) (0.62) [2]
Net increase (decrease) in net asset value (13.84) 2.42 [2] (23.74) [2]
Net asset value, end of year [2],[3] $ 23.34 [1] $ 37.18 [1] $ 34.76
Total Return (37.22%) 6.90% (40.60%)
Ratios to Average Net Assets      
Total income (loss) (37.75%) 19.27% (39.08%)
Management fees 0.60% 0.60% 0.60%
Expenses excluding management fees 0.70% 0.52% 0.67%
Net income (loss) (39.05%) 18.15% (40.35%)
[1] On January 4, 2018, there was a 1-for-4 reverse share split. Historical shares outstanding, net asset value per share and market value per share have been adjusted to reflect the 1-for-4 reverse share split on a retroactive basis.
[2] On January 4, 2018, there was a 1-for-4 reverse share split. The Financial Highlights have been adjusted for the period shown to reflect the 1-for-4 reverse share split on a retroactive basis.
[3] On January 4, 2018, there was a 1-for-4 reverse share split. The Statement of Changes in Partners’ Capital have been adjusted for the period shown to reflect the 1-for-4 reverse share split on a retroactive basis.