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Australian Dollar Deposits - Additional Information (Detail)	2 Months Ended	9 Months Ended
	Dec. 31, 2018 AUD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2019 AUD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 AUD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 AUD ($)
Cash And Cash Equivalents [Abstract]
Annual nominal rate		0.00%			0.00%
Principal deposits	$ 10,000,000	$ 14,241,193	$ 20,000,017	$ 11,376,327
Principal redemptions	$ 15,000,000	28,225,546	$ 39,999,890	$ 15,165,255
Deposits, interest bearing		$ 97,795,309			$ 145,000,127	$ 116,159,963	$ 165,000,000

X

- Definition

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.

+ References

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- Definition

Rate of interest on investment.

+ References

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The cash outflow for reacquisition of callable preferred stock.

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The cash inflow from issuance of preferred stock that is classified as callable.

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