FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Additional Information) (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Fees Paid and Related Party Transactions [Line Items] | |||
| USCF Management Fee | USL is contractually obligated to pay USCF a fee, which is paid monthly, equal to 0.60% per annum of average daily total net assets. | ||
| Ongoing Registration Fees and Other Offering Expenses | $ 0 | $ 0 | $ 1,350 |
| Licensing fee incurred | 16,713 | 10,849 | 7,910 |
| Estimated investor tax reporting cost | 25,000 | 100,000 | 169,000 |
| Estimated directors' fees and expenses | 10,843 | 9,808 | 15,649 |
| USL and the Related Public Funds, other than USCI, USAG, CPER and USMI | |||
| Fees Paid and Related Party Transactions [Line Items] | |||
| Estimated directors' fees and expenses | $ 582,050 | $ 569,303 | $ 567,863 |
| Licensing Agreements | On and after October 20, 2011 | |||
| Fees Paid and Related Party Transactions [Line Items] | |||
| Fee percentage | 0.015% | ||