SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail)			12 Months Ended
	Feb. 29, 2012 Redemption Baskets	Feb. 29, 2012 Prior to February 29, 2012 Redemption Baskets	Dec. 31, 2012 Maximum
Significant Accounting Policies [Line Items]
Number of units per basket	50,000	100,000
Cash equivalents maturity period			6 months