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FAIR VALUE OF FINANCIAL INSTRUMENTS (Valuation of Securities Using Fair Value Hierarchy) (Detail) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Short-Term Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Securities, fair value | $ 1,733,142,719 | $ 1,989,077,878
Exchange-Traded Futures Contracts [Member] | U S |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Securities, fair value | 102,316,280 | 117,780,350
Fair Value, Inputs, Level 1 [Member] | Short-Term Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Securities, fair value | 1,733,142,719 | 1,989,077,878
Fair Value, Inputs, Level 1 [Member] | Exchange-Traded Futures Contracts [Member] | U S |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Securities, fair value | 102,316,280 | 117,780,350
Fair Value, Inputs, Level 2 [Member] | Short-Term Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Securities, fair value | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Exchange-Traded Futures Contracts [Member] | U S |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Securities, fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Short-Term Investments [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Securities, fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Exchange-Traded Futures Contracts [Member] | U S |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Securities, fair value | $ 0 | $ 0

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