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FINANCIAL HIGHLIGHTS (Per share Performance Data and Other Supplemental Financial Data) (Detail) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Per Share Operating Performance: |  |  |
Net asset value, beginning of year | $ 11.02 | $ 20.15 | $ 35.23
Total income (loss) | 0.77 | (9.01) | (14.85)
Total expenses | (0.08) | (0.12) | (0.23)
Net increase (decrease) in net asset value | 0.69 | (9.13) | (15.08)
Net asset value, end of year | $ 11.71 | $ 11.02 | $ 20.15
Total Return | 6.26% | (45.31%) | (42.80%)
Ratios to Average Net Assets |  |  |
Total income (loss) | 20.57% | (49.08%) | (68.15%)
Expenses excluding management fees | 0.32% | 0.29% | 0.27%
Management fees | 0.45% | 0.45% | 0.45%
Net income (loss) | 19.80% | (49.82%) | (68.86%)

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