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Australian Dollar Deposits - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2024 AUD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 AUD ($)	Dec. 31, 2024 AUD ($)	Dec. 31, 2023 AUD ($)
Cash and Cash Equivalents [Abstract]
Annual nominal rate	1.92%				1.92%
Principal deposits	$ 35,707,713	$ 54,439,364	$ 19,742,611	$ 29,694,198
Principal redemptions	42,281,165	$ 64,337,430	30,120,478	$ 34,643,231
Deposits, interest bearing	$ 64,347,970		$ 77,670,560		$ 103,929,695	$ 113,827,761

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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