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ORGANIZATION AND BUSINESS (Additional Information) (Details)
 1 Months Ended 9 Months Ended
Nov. 30, 2009
Nov. 18, 2009
USD ($)
$ / shares
shares
Sep. 30, 2016
$ / shares
$ / Units
shares
Dec. 31, 2015
$ / shares
Sep. 30, 2015
$ / shares
Dec. 31, 2014
$ / shares
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]            
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets | $ / Units     350      
Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission 30,000,000          
Net asset value per share | $ / shares   $ 50.00 $ 10.14 $ 9.72 $ 11.28 $ 9.72
Number of units issued   200,000        
Value of unit issued | $   $ 10,000,000        
Number of registered units     30,000,000      
Creation Baskets [Member]            
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]            
Number of units per basket     50,000      
Redemption Baskets [Member]            
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]            
Number of units per basket     50,000