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Organization and Business (Additional Information) (Details) (USD $)
 1 Months Ended
Dec. 06, 2007
Dec. 04, 2007
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Feb. 29, 2012
Creation Baskets
Feb. 29, 2012
Redemption Baskets [Member]
Dec. 31, 2013
Beginning on January 1, 2013 and after
Dec. 31, 2013
Open Cleared Swap and Futures Contracts
Open Futures Contracts, Long
United States
Contracts
Dec. 31, 2012
Open Cleared Swap and Futures Contracts
Open Futures Contracts, Long
United States
Contracts
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]                        
Number of Contracts                     649 [1] 1,068 [2]
Number of shares 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   11,000,000                    
Net asset value per share $ 50.00   $ 42.83 $ 39.81 $ 43.46 $ 42.91 $ 42.91          
Number of shares issued 300,000                      
Value of shares issued $ 15,000,000                      
Commenced investment operations date Dec. 06, 2007                      
Number of registered shares     111,000,000                  
[1] Collateral amounted to $3,548,144 on open futures contracts.
[2] Collateral amounted to $11,533,650 on open futures contracts.