Fair Value of Bitcoin - Summary of Changes in Quantity of Bitcoin and the Respective Fair Value (Detail) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2026 USD ($) Bitcoin	Sep. 30, 2025 USD ($) Bitcoin	Sep. 30, 2026 USD ($) Bitcoin	Sep. 30, 2025 USD ($) Bitcoin
Fair Value Disclosures [Abstract]
Investment Owned, Beginning balance \| Bitcoin			48,474.93659149	38,012.91129948
Bitcoin contributed \| Bitcoin			18,982.24127691	13,289.25478462
Bitcoin redeemed \| Bitcoin			(4,308.88880514)	(3,517.53594793)
Bitcoin distributed for Sponsor's Fee, related party \| Bitcoin			(60.95012406)	(48.38833982)
Net change in unrealized appreciation on investment in Bitcoin \| Bitcoin			0	0
Investment Owned, Ending balance \| Bitcoin	63,087.3389392	47,736.24179635	63,087.3389392	47,736.24179635
Investment Owned, Beginning balance			$ 4,243,952	$ 3,550,034
Bitcoin contributed			1,326,995	1,384,510
Bitcoin redeemed			(310,456)	(328,623)
Bitcoin distributed for Sponsor's Fee, related party			(4,445)	(4,971)
Net change in unrealized appreciation/depreciation	$ 1,481,722	$ 263,511	50,803	791,573
Net realized (loss) gain	(142)	23,993	(35,892)	68,598
Investment Owned, Ending Balance	$ 5,270,957	$ 5,461,121	$ 5,270,957	$ 5,461,121