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Contracts and Agreements (Additional Information) (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]    
Annual Fee for transfer agency services $ 20,000  
Brokerage commissions 1,400 3,982
Ratio of expense to Average Net Assets 0.01% 0.01%
Maximum
    
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]    
Transaction fees per transaction 15  
Commissions per round-turn trade, including applicable exchange and NFA fees for Oil Futures Contracts and options on Oil Futures Contracts 15  
Minimum
    
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]    
Annual Fee for transfer agency services 75,000  
Transaction fees per transaction 7  
Commissions per round-turn trade, including applicable exchange and NFA fees for Oil Futures Contracts and options on Oil Futures Contracts 7  
Re balancing Investments Transaction
    
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]    
Brokerage commissions 999 1,852
Floor Brokerage Exchange And Clearance Fees Percentage 71.36% 46.51%
Trades Necessitated By Creation And Redemption Activity
    
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]    
Brokerage commissions 401 2,130
Floor Brokerage Exchange And Clearance Fees Percentage 28.64% 53.49%
First $500 million of USL's, USOF's, USNG's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets
    
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]    
Fee percentage 0.06%  
First $500 million of USL's, USOF's, USNG's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets | Maximum
    
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]    
Base amount for determining fee percentage 500,000,000  
USL's, USOF's, USNG's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets greater than $500 million but less than $1 billion
    
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]    
Fee percentage 0.0465%  
USL's, USOF's, USNG's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets greater than $500 million but less than $1 billion | Maximum
    
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]    
Base amount for determining fee percentage 1,000,000,000  
USL's, USOF's, USNG's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets greater than $500 million but less than $1 billion | Minimum
    
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]    
Base amount for determining fee percentage 500,000,000  
USL's, USOF's, USNG's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets exceed $1 billion
    
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]    
Fee percentage 0.035%  
USL's, USOF's, USNG's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets exceed $1 billion | Maximum
    
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]    
Base amount for determining fee percentage 1,000,000,000  
Marketing Agreement | USL's assets up to $3 billion
    
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]    
Fee percentage 0.06%  
Marketing Agreement | USL's assets up to $3 billion | Maximum
    
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]    
Base amount for determining fee percentage 3,000,000,000  
Marketing Agreement | USL's assets in excess of $3 billion
    
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]    
Fee percentage 0.04%  
Marketing Agreement | USL's assets in excess of $3 billion | Minimum
    
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]    
Base amount for determining fee percentage $ 3,000,000,000