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SEGMENT INFORMATION - Reconciliation of Adjusted EBITDA to Operating Income (Details) - USD ($) $ in Thousands, shares in Millions		3 Months Ended		9 Months Ended
	Jan. 13, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting, Other Significant Reconciling Item
Total Segment Adjusted EBITDA		$ 54,628	$ 87,082	$ 222,127	$ 184,752
Stock-based compensation expense		(16,992)	(18,207)	(16,067)	(58,144)
Depreciation		(8,996)	(8,877)	(28,922)	(30,725)
Amortization of intangibles		(23,511)	(36,355)	(70,452)	(109,793)
Interest expense		(27,636)	(34,656)	(93,117)	(103,810)
Unrealized gain (loss) on investment in MGM Resorts International		17,476	(346,272)	648	(361,805)
Other (expense) income, net		(18,438)	10,384	(7,922)	90,828
Loss from continuing operations before income taxes		(48,996)	(362,398)	(84,438)	(451,551)
Chief Executive Officer | Restricted Stock | Employment Transition Agreement
Segment Reporting, Other Significant Reconciling Item
Stock-based compensation expense	$ (14,900)
Reversal of stock-based compensation expense related to individual				49,800
Chief Executive Officer | Restricted Stock | Employment Transition Agreement | Class B common stock
Segment Reporting, Other Significant Reconciling Item
Shares transferred (in shares)	5.0
Operating Segments
Segment Reporting, Other Significant Reconciling Item
Total Segment Adjusted EBITDA		54,628	87,082	222,127	184,752
Corporate
Segment Reporting, Other Significant Reconciling Item
Total Segment Adjusted EBITDA		$ (25,527)	$ (15,497)	$ (90,733)	$ (62,854)

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- Definition

The Company's primary financial measure is Adjusted EBITDA, which is defined as operating income excluding: (1) stock-based compensation expense; (2) depreciation; and (3) acquisition-related items consisting of (i) amortization of intangible assets and impairments of goodwill and intangible assets, if applicable, and (ii) gains and losses recognized on changes in the fair value of contingent consideration arrangements. The Company believes this measure is useful for analysts and investors as this measure allows a more meaningful comparison between our performance and that of our competitors. Moreover, our management uses this measure internally to evaluate the performance of our business as a whole and our individual business segments, and this measure is one of the primary metrics by which our internal budgets are based and by which management is compensated. The above items are excluded from our Adjusted EBITDA measure because these items are non-cash in nature, and we believe that by excluding these items, Adjusted EBITDA corresponds more closely to the cash operating income generated from our business, from which capital investments are made and debt is serviced. Adjusted EBITDA has certain limitations in that it does not take into account the impact to IAC's statement of operations of certain expenses.

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