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CONTRACTS AND AGREEMENTS (Additional Information) (Detail) | 12 Months Ended
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Dec. 31, 2017 USD ($) $ / Unit
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Annual fee for custody, fund accounting and fund administration services | $ 75,000
Marketing Agreement [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Marketing fee exclusive of the incentive fee | $ 425,000
Marketing Agreement [Member] | USOF's assets from $0- $500 million [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Fee percentage | 0.00%
Marketing Agreement [Member] | USOF's assets from $0- $500 million [Member] | Minimum [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Base amount for determining fee percentage | $ 0
Marketing Agreement [Member] | USOF's assets from $0- $500 million [Member] | Maximum [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Base amount for determining fee percentage | $ 500,000,000
Marketing Agreement [Member] | USOF's assets from $500 million - $4 billion [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Fee percentage | 0.04%
Marketing Agreement [Member] | USOF's assets from $500 million - $4 billion [Member] | Minimum [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Base amount for determining fee percentage | $ 500,000,000
Marketing Agreement [Member] | USOF's assets from $500 million - $4 billion [Member] | Maximum [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Base amount for determining fee percentage | $ 4,000,000,000
Marketing Agreement [Member] | USOF's assets in excess of $4 billion [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Fee percentage | 0.03%
Ratio of expense to Average Net Assets | 10.00%
Marketing Agreement [Member] | USOF's assets in excess of $4 billion [Member] | Minimum [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Base amount for determining fee percentage | $ 4,000,000,000
Brown Brothers Harriman & Co. Agreements [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Annual fee for transfer agency services | 20,000
Brown Brothers Harriman & Co. Agreements [Member] | Minimum [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Annual fee for custody, fund accounting and fund administration services | $ 75,000
Transaction fees per transaction | $ / Unit | 7
Brown Brothers Harriman & Co. Agreements [Member] | Maximum [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Transaction fees per transaction | $ / Unit | 15
Brown Brothers Harriman & Co. Agreements [Member] | First $500 million of USOF's, USNG's, US12OF's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Fee percentage | 0.06%
Base amount for determining fee percentage | $ 500,000,000
Brown Brothers Harriman & Co. Agreements [Member] | USOF's, USNG's, US12OF'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 [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Fee percentage | 0.0465%
Brown Brothers Harriman & Co. Agreements [Member] | USOF's, USNG's, US12OF'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 [Member] | Minimum [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Base amount for determining fee percentage | $ 500,000,000
Brown Brothers Harriman & Co. Agreements [Member] | USOF's, USNG's, US12OF'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 [Member] | Maximum [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Base amount for determining fee percentage | $ 1,000,000,000
Brown Brothers Harriman & Co. Agreements [Member] | USOF's, USNG's, US12OF'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 [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Fee percentage | 0.035%
Base amount for determining fee percentage | $ 1,000,000,000
Brokerage and Futures Commission Merchant Agreements [Member] | Minimum [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Commissions per round-turn trade, including applicable exchange, clearing and NFA fees for Oil Futures Contracts and options on Oil Futures Contracts | $ / Unit | 7
Brokerage and Futures Commission Merchant Agreements [Member] | Maximum [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Commissions per round-turn trade, including applicable exchange, clearing and NFA fees for Oil Futures Contracts and options on Oil Futures Contracts | $ / Unit | 8

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- Definition Those fees charged for services related to holding, advising, and managing customer investment assets. These account fees usually charged annually or semi-annually, on a per security basis, for the costs of services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Expenditures for planning and executing the conception, pricing, promotion, and distribution of ideas, goods, and services. Costs of public relations and corporate promotions are typically considered to be marketing costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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