Share Purchases and Redemptions - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2020 CreationUnit shares
Equity [Abstract]
Minimum number of Creation Units that can be purchased | CreationUnit	1
Number of shares issued per Creation Unit | shares	200,000
Minimum number of Creation Units that can be redeemed | CreationUnit	1
Number of shares that can be redeemed per Creation | shares	200,000