Condensed Consolidated Statements of Comprehensive Income / (Loss) (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Statement of Comprehensive Income [Abstract]
Net income	$ 44,208	$ 23,527	$ 214,432	$ 2,107
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax expense of $18 and tax benefit of $167 for the three and six months ended June 30, 2026, respectively and tax expense of $132 for both three and six months ended June 30, 2025	134	1,123	(1,588)	1,123
Comprehensive income attributable to Miami International Holdings, Inc., net of tax	$ 44,342	$ 24,650	$ 212,844	$ 3,230