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Australian Dollar Deposits - Additional Information (Detail)	9 Months Ended			12 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2021 AUD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 AUD ($)	Sep. 30, 2021 AUD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 AUD ($)
Cash And Cash Equivalents [Abstract]
Annual nominal rate	0.00%				0.00%
Principal deposits	$ 11,566,005	$ 14,935,112	$ 78,112,056	$ 114,776,341
Principal redemptions	41,798,443	54,716,972	$ 23,331,674	39,913,155
Withdrawals (to pay expenses)		$ 582,078		$ 529,228
Deposits, interest bearing	$ 118,436,193				$ 163,959,512	$ 157,666,229	$ 204,323,450

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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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Rate of interest on investment.

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