v3.25.2
Fair Value of ETC - Summary of changes in quantity of ETC and the respective fair value (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
USD ($)
ETC
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
ETC
Jun. 30, 2024
USD ($)
ETC
Dec. 31, 2024
USD ($)
ETC
Fair Value Disclosures [Abstract]          
Investment Owned, Balance | ETC     11,263,626.2550315 11,548,776.1723 11,548,776.1723
ETC contributed | ETC     0   0
ETC distributed for Sponsor's Fee, related party | ETC     (138,780.8305803)   (285,149.91726843)
Net change in unrealized (depreciation) appreciation on investment in ETC | ETC     0   0
Net realized gain on investment in ETC | ETC     0   0
Investment Owned, Balance | ETC 11,124,845.4244512   11,124,845.4244512   11,263,626.2550315
Investment Owned, at Fair Value | $     $ 283,055 $ 253,958 $ 253,958
ETC contributed | $     0   0
ETC distributed for Sponsor's Fee, related party | $     (2,690)   (7,157)
Net change in unrealized appreciation on investment in ETC | $ $ (1,424) $ (121,879) (95,443) 15,847 31,251
Net realized gain on investment in ETC | $ 653 $ 1,436 1,642 $ 2,886 5,003
Investment Owned, at Fair Value | $ $ 186,564   $ 186,564   $ 283,055