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FINANCIAL HIGHLIGHTS (Per share Performance Data and Other Supplemental Financial Data) (Detail) - $ / shares
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Per Share Operating Performance:    
Net asset value, beginning of period $ 11.02 $ 20.15
Total income (loss) 0.04 (5.49)
Total expenses (0.06) (0.09)
Net increase (decrease) in net asset value (0.02) (5.58)
Net asset value, end of period $ 11 $ 14.57
Total Return (0.18%) (27.69%)
Ratios to Average Net Assets    
Total income (loss) 11.69% (17.63%)
Management fees [1] 0.45% 0.45%
Expenses excluding management fees [1] 0.32% 0.27%
Net income (loss) 11.11% (18.17%)
[1] Annualized.