Non-controlling interests - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	May 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Noncontrolling Interest [Line Items]
Equity, Including Portion Attributable to Noncontrolling Interest	$ 4,693,000	$ 4,443,000	$ 4,693,000	$ 4,443,000		$ (4,592,000)	$ (16,486,000)	$ 4,981,000	$ 9,373,000
Net income attributable to non-controlling interest	6,253,000	6,911,000	14,235,000	4,221,000
Non-controlling Interest [Member]
Noncontrolling Interest [Line Items]
Equity, Including Portion Attributable to Noncontrolling Interest	2,537,000	21,104,000	2,537,000	21,104,000		12,570,000	7,146,000	21,598,000	25,187,000
Non Controlling Interests Bit Access and Bitcoin Depot Inc [Member]
Noncontrolling Interest [Line Items]
Equity, Including Portion Attributable to Noncontrolling Interest	2,537,000	21,104,000	2,537,000	21,104,000	$ 0	12,570,000	7,146,000	21,598,000	25,187,000
Bit Access [Member]
Noncontrolling Interest [Line Items]
Equity, Including Portion Attributable to Noncontrolling Interest	$ 2,537,000	$ 2,767,000	$ 2,537,000	$ 2,767,000		$ 2,633,000	$ 2,674,000	$ 2,719,000	$ 2,707,000
Bit Access [Member] | Non-controlling Interest [Member]
Noncontrolling Interest [Line Items]
Non-controlling interest ownership percentage	17.86%		17.86%				17.86%
BT Hold Co [Member]
Noncontrolling Interest [Line Items]
Net income attributable to non-controlling interest			$ 6,400,000