Related Party Transactions - Disbursements to Trustees (Detail) - USD ($)		3 Months Ended				6 Months Ended
		Jun. 30, 2022		Jun. 30, 2021		Jun. 30, 2022	Jun. 30, 2021
Related Party Transaction [Line Items]
Trustee Fees and Expenses		$ 0	[1]	$ 11,250	[2]	$ 5,625	$ 11,250
Individual [Member]
Related Party Transaction [Line Items]
Trustee Fees and Expenses		0		2,500		1,250	2,500
Corporate Trustee [Member]
Related Party Transaction [Line Items]
Trustee Fees and Expenses		0		1,250		625	1,250
Transfer Agent Registrar Fees [Member]
Related Party Transaction [Line Items]
Trustee Fees and Expenses	[3]	$ 0		$ 7,500		$ 3,750	$ 7,500

[1] Corporate Trustee Fees of $625, Individual Trustee Fees of $1,250 and Transfer Agent Registrar Fees of $3,750 attributable to the three-months ended March 31, 2022 were actually paid by the Trust on July 5, 2022.

[2] Includes amounts reserved for administrative expenses in the aggregate amount of $5,625 attributable to the three-months ended March 31, 2021 which were actually paid by the Trust on April 15, 2021.

[3] These services are performed by the Corporate Trustee.