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ORGANIZATION AND BUSINESS (Additional Information) (Details)
Dec. 06, 2007
USD ($)
$ / shares
shares
Dec. 31, 2016
Contracts
$ / shares
$ / Units
Dec. 31, 2015
Contracts
$ / shares
Dec. 31, 2014
$ / shares
Dec. 31, 2013
$ / shares
Dec. 31, 2012
$ / shares
Dec. 31, 2007
Contracts
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   350          
Net asset value per share | $ / shares $ 50.00 $ 20.39 $ 17 $ 26.59 $ 42.83 $ 42.83  
Number of shares issued | shares 300,000            
Value of shares issued | $ $ 15,000,000            
Number of registered shares | Contracts   111,000,000         11,000,000
Creation Baskets              
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]              
Number of shares per basket   50,000          
Open Futures Contracts, Long | United States              
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]              
Number of Contracts | Contracts   2,247 1,710 [1]        
Prior to July 1, 2011              
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   1,000          
[1] Collateral amounted to $29,320,958 on open futures contracts.