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Australian Dollar Deposits - Additional Information (Detail) | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2024 AUD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2023 AUD ($) | Sep. 30, 2024 AUD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 AUD ($)
Cash and Cash Equivalents [Abstract] |  |  |  |  |  |  |
Annual nominal rate | 1.92% |  |  |  | 1.92% |  |
Principal deposits | $ 29,539,589 | $ 44,541,298 | $ 6,690,122 | $ 29,694,198 |  |  |
Principal redemptions | 39,066,378 | $ 59,388,397 | $ 23,375,322 | $ 34,643,231 |  |  |
Deposits, interest bearing | $ 68,667,902 |  |  |  | $ 98,980,662 | $ 77,670,560 | $ 113,827,761

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