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Organization - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2024
CreationUnit
shares
Dec. 31, 2023
shares
Feb. 23, 2015
shares
Aug. 03, 2006
Trust
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Number of series of trusts | Trust       7
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