Derivative Instruments - Summary of Gross and Net Amounts of Offsetting Assets and Liabilities (Detail) - Morgan Stanley & Co. LLC [Member] - Currency Futures Contracts [Member] - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Offsetting Assets And Liabilities [Line Items]
Financial Derivative Assets, Futures Contracts	$ 3,320,899	$ 5,197,738
Financial Derivative Liabilities, Futures Contracts	(4,534,517)	(7,972,637)
Net value of derivatives	(1,213,618)	(2,774,899)
Collateral (Received)/Pledged, Non-Cash	$ 1,213,618	$ 2,774,899

Amount of obligation to return securities collateral under master netting arrangements that have not been offset against derivative assets.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Offsetting assets and liabilities.

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