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Organization and Business (Additional Information) (Details)
Dec. 06, 2007
USD ($)
$ / shares
shares
Dec. 04, 2007
Dec. 31, 2015
Contracts
$ / shares
$ / Units
Dec. 31, 2014
Contracts
$ / shares
Dec. 31, 2013
$ / shares
Dec. 31, 2012
$ / shares
Dec. 31, 2011
$ / 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     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 | $ / shares $ 50.00   $ 17 $ 26.59 $ 42.83 $ 39.81 $ 39.81
Number of shares issued | shares 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 | Contracts     1,710 [1] 658 [2]      
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.
[2] Collateral amounted to $19,785,491 on open futures contracts.