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ORGANIZATION AND BUSINESS (Additional Information) (Details) (USD $)
 1 Months Ended
Nov. 30, 2009
Nov. 18, 2009
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Feb. 29, 2012
Creation Baskets [Member]
Jun. 30, 2013
Open Futures Contracts, Long [Member]
United States [Member]
Jun. 30, 2013
Open Futures Contracts, Long [Member]
United States [Member]
Contracts
Sep. 30, 2011
Partnership Unit [Member]
Feb. 29, 2012
Prior to February 29, 2012 [Member]
Creation Baskets [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]                      
Number of Contracts               686 686 [1]    
Number of units per basket             50,000       100,000
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets     350             1,000  
Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission 30,000,000                    
Net asset value per unit   $ 50.00 $ 17.21 $ 17.23 $ 17.38 $ 21.21          
Number of units issued   200,000                  
Value of unit issued   $ 10,000,000                  
Commenced investment operations date   Nov. 18, 2009                  
Number of registered units     30,000,000                
[1] Collateral amounted to $3,050,936 on open futures contracts.