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FINANCIAL HIGHLIGHTS (Per share Performance Data and Other Supplemental Financial Data) (Detail) - $ / shares | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Per Share Operating Performance: |  |  |
Net asset value, beginning of period |  | $ 12.08 | $ 11.71
Total income (loss) |  | 1.04 | (1.07)
Total expenses |  | (0.02) | (0.02)
Net increase (decrease) in net asset value |  | 1.02 | (1.09)
Net asset value, end of period |  | $ 13.1 | $ 10.62
Total Return |  | 8.44% | (9.31%)
Ratios to Average Net Assets |  |  |
Total income (loss) |  | 8.85% | (8.52%)
Management fees | [1] | 0.45% | 0.45%
Expenses excluding management fees | [1] | 0.29% | 0.28%
Net income (loss) |  | 8.67% | (8.71%)
[1] | Annualized.

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