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Organization - Additional Information (Detail)	6 Months Ended
Organization - Additional Information (Detail)	Jun. 30, 2025 CreationUnit shares	Dec. 31, 2024 shares	Dec. 31, 2023 shares	May 23, 2005 shares
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General shares, shares issued	40	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