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Fees Paid by Fund and Related Party Transactions - Additional Information (Detail) (USD $)
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3 Months Ended | 12 Months Ended | |||||||||
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Fees Paid and Related Party Transactions [Line Items] | |||||||||||
| USCF Management Fee | UGA is contractually obligated to pay USCF a fee, which is paid monthly, equal to 0.60% per annum of average daily total net assets. | ||||||||||
| Percentage of average daily net assets | 0.60% | 0.60% | |||||||||
| Ongoing registration fees and other offering expenses | $ 46,454 | $ 20,911 | $ 9,125 | ||||||||
| Licensing fee incurred | 8,779 | 13,751 | 26,907 | ||||||||
| Estimated investor tax reporting cost | 200,000 | 225,000 | 250,000 | ||||||||
| Expense waiver | 16,030 | 30,338 | 46,652 | 44,756 | 64,418 | 37,603 | 19,969 | 17,456 | 137,776 | 139,446 | 104,053 |
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Maximum
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| Fees Paid and Related Party Transactions [Line Items] | |||||||||||
| Costs and expenses annual limit for reimbursement | 0.15% | ||||||||||
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UGA and the Related Public Funds
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| Fees Paid and Related Party Transactions [Line Items] | |||||||||||
| Estimated directors' fees and expenses | 555,465 | 540,586 | 607,582 | ||||||||
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United States Gas Fund Lp
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| Fees Paid and Related Party Transactions [Line Items] | |||||||||||
| Estimated directors' fees and expenses | 13,365 | 18,888 | 14,746 | ||||||||
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Licensing Agreements | First $1,000,000,000 of combined net assets of the funds
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| Fees Paid and Related Party Transactions [Line Items] | |||||||||||
| Fee percentage | 0.04% | ||||||||||
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Licensing Agreements | First $1,000,000,000 of combined net assets of the funds | Maximum
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| Fees Paid and Related Party Transactions [Line Items] | |||||||||||
| Combined assets basis for determining fee percentage | 1,000,000,000 | 1,000,000,000 | |||||||||
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Licensing Agreements | First $1,000,000,000 of combined net assets of the funds | Minimum
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| Fees Paid and Related Party Transactions [Line Items] | |||||||||||
| Combined assets basis for determining fee percentage | $ 1,000,000,000 | $ 1,000,000,000 | |||||||||
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Licensing Agreements | Combined net assets above $1,000,000,000
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| Fees Paid and Related Party Transactions [Line Items] | |||||||||||
| Fee percentage | 0.02% | ||||||||||
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Licensing Agreements | On and after October 20, 2011
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| Fees Paid and Related Party Transactions [Line Items] | |||||||||||
| Fee percentage | 0.015% | ||||||||||
| Assets basis for determining fee percentage | on all net assets | ||||||||||