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ORGANIZATION AND BUSINESS (Additional Information) (Detail) | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Apr. 10, 2006 USD ($) $ / shares shares | Jun. 30, 2018 $ / shares $ / Unit shares | Dec. 31, 2017 $ / shares | Jun. 30, 2017 $ / shares | Dec. 31, 2016 $ / shares
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets | $ / Unit |  |  | 1,000 |  |  |
Limited Partners' Capital Account, Units Authorized |  | 17,000,000 | 3,127,000,000 |  |  |
Limited Partners' Capital Account, Units Issued |  | 200,000 |  |  |  |
Net asset value per unit | $ / shares |  | $ 67.39 | $ 15.02 | $ 12.08 | $ 9.47 | $ 11.71
Value of units issued | $ |  | $ 13,479,000 |  |  |  |
Creation Baskets [Member] |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |
Number of units per basket |  |  | 100,000 |  |  |
Redemption Baskets [Member] |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |
Number of units per basket |  |  | 100,000 |  |  |
Open Futures Contracts, Long [Member] | United States [Member] | NYMEX WTI Crude Oil Futures CL November 2017 contracts, expiring October 2017 [Member] |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |
Number of Contracts | [1] |  | 24,431 |  |  |
[1] | Collateral amounted to $124,439,236 on open futures contracts.

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