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SEGMENT INFORMATION - Financial Data by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Revenue	$ 1,246,874	$ 1,104,592	$ 3,539,375	$ 3,158,789
Operating income (loss)	185,852	172,832	420,035	431,219
Operating segments | Match Group
Segment Reporting Information [Line Items]
Revenue	541,493	443,943	1,504,091	1,272,506
Operating income (loss)	176,604	139,895	468,330	402,293
Adjusted EBITDA	206,131	165,039	564,720	478,341
Operating segments | ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	357,358	303,116	1,004,697	853,249
Operating income (loss)	24,726	33,515	32,488	46,021
Adjusted EBITDA	58,923	77,700	147,534	181,319
Operating segments | Vimeo
Segment Reporting Information [Line Items]
Revenue	52,145	40,304	141,439	115,432
Operating income (loss)	(11,155)	(6,161)	(40,555)	(25,502)
Adjusted EBITDA	(7,997)	(4,229)	(33,661)	(19,644)
Operating segments | Dotdash
Segment Reporting Information [Line Items]
Revenue	40,285	30,053	111,974	90,841
Operating income (loss)	3,695	2,416	13,752	6,946
Adjusted EBITDA	7,026	3,071	22,551	8,914
Operating segments | Applications
Segment Reporting Information [Line Items]
Revenue	126,071	153,973	402,557	429,034
Operating income (loss)	39,099	33,041	85,422	91,579
Adjusted EBITDA	25,433	34,989	80,440	97,145
Operating segments | Emerging & Other
Segment Reporting Information [Line Items]
Revenue	129,581	133,345	374,871	398,026
Operating income (loss)	(1,821)	10,893	(6,130)	23,465
Adjusted EBITDA	(1,529)	12,235	(5,141)	28,733
Inter-segment eliminations
Segment Reporting Information [Line Items]
Revenue	(59)	(142)	(254)	(299)
Corporate
Segment Reporting Information [Line Items]
Operating income (loss)	(45,296)	(40,767)	(133,272)	(113,583)
Adjusted EBITDA	$ (21,945)	$ (21,478)	$ (60,751)	$ (54,038)

X

- 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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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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-Publisher FASB
-Name Accounting Standards Codification
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