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Organization - Additional Information (Detail)
 9 Months Ended
Sep. 30, 2024
CreationUnit
shares
Dec. 31, 2023
shares
May 23, 2005
shares
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
General shares, shares issued 40 40 40
Treasury obligation measurement maximum maturity period 12 months    
Minimum number of Creation Units that can be purchased | CreationUnit 1    
Number of shares issued per Creation Unit 50,000