Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Incentive Distribution Made To Managing Member Or General Partner [Line Items]
Distribution, date of record	Dec. 24, 2019
Distribution, date of payment	Dec. 31, 2019
Average charges paid to broker per round-turn trade, maximum	$ 6.00	$ 6.00	$ 6.00
General Shares [Member]
Incentive Distribution Made To Managing Member Or General Partner [Line Items]
Distribution, amount per share	$ 0.52612	$ 0.27586	$ 0.02302
Distributed earnings	$ 21	$ 9	$ 1
Shares [Member]
Incentive Distribution Made To Managing Member Or General Partner [Line Items]
Distribution, amount per share	$ 0.52612	$ 0.27586	$ 0.02302
Distributed earnings	$ 5,050,752	$ 5,572,374	$ 538,668

The total amount of dividends declared in the period for each class of stock and the contractual amount of dividends (or interest on participating income bonds) that must be paid for the period (for example, unpaid cumulative dividends). Dividends declared in the current period do not include dividends declared in respect of prior-period unpaid cumulative dividends. Preferred dividends that are cumulative only if earned are deducted only to the extent that they are earned.

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Date the declared dividend will be paid, in CCYY-MM-DD format.

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The distribution amount per share for all classes of units.

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Average charges paid to broker per round turn trade maximum.

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