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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Additional Information) (Detail) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2018
Fees Paid And Related Party Transactions [Line Items]          
USCF Management Fee    
USO is contractually obligated to pay USCF a fee, which is paid monthly, equal to 0.45% per annum of average daily total net assets.
    
Ongoing Registration Fees and Other Offering Expenses $ 5,899 $ 86,868 $ 87,363 $ 172,781  
Fees and expenses 80,087 89,727 155,643 180,337  
Licensing fee incurred $ 70,708 $ 107,717 143,625 215,270  
Scenario, Forecast [Member]          
Fees Paid And Related Party Transactions [Line Items]          
Estimated investor tax reporting cost         $ 1,850,000
USO And Related Public Funds [Member] | Scenario, Forecast [Member]          
Fees Paid And Related Party Transactions [Line Items]          
Fees and expenses         536,200
USO [Member]          
Fees Paid And Related Party Transactions [Line Items]          
Ongoing Registration Fees and Other Offering Expenses     87,363 172,781  
Licensing fee incurred     $ 143,625 $ 215,270  
USO [Member] | Scenario, Forecast [Member]          
Fees Paid And Related Party Transactions [Line Items]          
Fees and expenses         $ 324,000
Licensing Agreements [Member]          
Fees Paid And Related Party Transactions [Line Items]          
Fee percentage     0.015%