Summary of Significant Accounting Policies - Schedule of Distributions Per General Share and Share (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Distributions paid	$ 0
General Shares [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Distributions per Share		$ 0.52530
Distributions paid		$ 21
Shares [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Distributions per Share		$ 0.52530
Distributions paid		$ 1,786,020