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Summary of Significant Accounting Policies - Schedule of Distributions per General Share and Share in Total (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
General Shares [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Distribution per share | $ 0.53553 | $ 0.89039 | $ 0.96078
Distributions paid | $ 21 | $ 36 | $ 38
Shares [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Distribution per share | $ 0.53553 | $ 0.89039 | $ 0.96078
Distributions paid | $ 4,070,028 | $ 2,715,689 | $ 3,266,652

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 60B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482689/260-10-45-60B + Details
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- Definition The distribution amount per share for all classes of units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 5 -Subparagraph (SAB Topic 4.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480008/505-10-S99-5 + Details
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