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Financial Highlights - Schedule of Net Asset Value Per Share (Detail) - $ / shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Net Asset Value |  |  |  |
Net asset value per Share, beginning of period | $ 23.92 | $ 21.10 | $ 20.74 | $ 20.16
Net realized and change in unrealized gain (loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts | 1.86 | 0.08 | 4.53 | 0.64
Net investment income (loss) | 0.27 | 0.24 | 0.78 | 0.62
Net income (loss) | 2.13 | 0.32 | 5.31 | 1.26
Net asset value per Share, end of period | 26.05 | 21.42 | 26.05 | 21.42
Market value per Share, beginning of period | 23.81 | 21.08 | 20.73 | 20.15
Market value per Share, end of period | $ 26.10 | $ 21.40 | $ 26.10 | $ 21.40
Ratio to average Net Assets |  |  |  |
Net investment income (loss) | 4.35% | 4.41% | 4.39% | 3.96%
Expenses, after waivers | 0.89% | 0.86% | 0.88% | 0.88%
Expenses, prior to waivers | 0.94% | 0.92% | 0.93% | 0.93%
Total Return, at net asset value | 8.90% | 1.52% | 25.60% | 6.25%
Total Return, at market value | 9.62% | 1.52% | 25.90% | 6.20%

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