iAnthus Capital Holdings, Inc. Annual report [Section 13 and 15(d), not S-K Item 405]

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Federal statutory rate	21.00%	21.00%
Domestic Tax Jurisdiction [Member] \| Tax Period Two Thousand And Thirty Five Through Two Thousand And Thirty Seven [Member]
Operating loss carryforwards	$ 154.2
State and Local Jurisdiction [Member] \| Tax Period Two Thousand And Twenty Eight Through Two Thousand And Forty Three [Member]
Operating loss carryforwards	145.4
Canada Revenue Agency [Member] \| Tax Period Two Thousand And Twenty Five Through Two Thousand And Forty Two [Member]
Non-capital loss carryforwards	$ 128.4