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Organization and Business (Additional Information) (Details) (USD $)
 0 Months Ended
Dec. 04, 2007
Dec. 06, 2007
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
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      
Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission 11,000,000          
Net asset value per share   $ 50.00 $ 47.17 $ 42.83 $ 40.07 $ 39.81
Number of shares issued   300,000        
Value of shares issued   $ 15,000,000        
Number of registered shares     111,000,000      
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     583 [1]      
[1] Collateral amounted to $601,117 on open future contracts.