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FINANCIAL HIGHLIGHTS (Details) (USD $)
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Per Unit Operating Performance:    
Net Asset Value, beginning of period $ 74.54 $ 63.08
Total income (loss) $ 7.25 $ 6.73
Total expenses $ (0.59) $ (0.56)
Net increase in net asset value $ 6.66 $ 6.17
Net Asset Value Per Unit: $ 81.20 $ 69.25
Total Return 8.93% 9.78%
Ratios to Average Net Assets    
Total income (loss) 8.40% 7.80%
Management fees* 0.75% [1] 0.75% [1]
Total expenses excluding management fees* 0.30% [1] 0.60% [1]
Expenses waived* (0.07%) [1] (0.37%) [1]
Net expenses excluding management fees* 0.23% [1] 0.23% [1]
Net income (loss) 7.66% 7.07%
[1] Total returns are calculated based on the change in value during the period. An individual unitholder's total return and ratio may vary from the above total returns and ratios based on the timing of contributions to and withdrawals from USBO.