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SEGMENT INFORMATION - Schedule of Reconciliation of Operating Income (Loss) to Adjusted EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	$ 89,950	$ 37,060
Stock-based compensation expense	59,082	33,975
Depreciation	19,257	19,888
Amortization of intangibles	19,953	9,161
Adjusted EBITDA	188,398	101,976
Interest expense	(26,505)	(24,792)
Other expense, net	(4,619)	(7,714)
Earnings before income taxes	58,826	4,554
Income tax benefit (provision)	29,013	23,909
Net earnings	87,839	28,463
Net earnings attributable to noncontrolling interests	(16,757)	(2,254)
Net earnings attributable to IAC shareholders	71,082	26,209
Operating segments | Match Group
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	112,233	58,871
Stock-based compensation expense	16,963	18,024
Depreciation	8,147	7,589
Amortization of intangibles	242	403
Acquisition-related Contingent Consideration Fair Value Adjustments	156	1,344
Adjusted EBITDA	137,741	86,231
Operating segments | ANGI Homeservices
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	(10,756)	1,388
Stock-based compensation expense	24,906	4,461
Depreciation	6,184	2,996
Amortization of intangibles	16,306	1,367
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0
Adjusted EBITDA	36,640	10,212
Operating segments | Video
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	(15,875)	(15,589)
Stock-based compensation expense	131	0
Depreciation	675	544
Amortization of intangibles	2,129	313
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0
Adjusted EBITDA	(12,940)	(14,732)
Operating segments | Applications
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	25,461	32,768
Stock-based compensation expense	0	0
Depreciation	755	1,011
Amortization of intangibles	536	606
Acquisition-related Contingent Consideration Fair Value Adjustments	0	548
Adjusted EBITDA	26,752	34,933
Operating segments | Publishing
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	15,811	(5,788)
Stock-based compensation expense	0	0
Depreciation	662	2,019
Amortization of intangibles	740	4,948
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0
Adjusted EBITDA	17,213	1,179
Operating segments | Other
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	0	(5,621)
Stock-based compensation expense	0	1,729
Depreciation		836
Amortization of intangibles	0	1,524
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0
Adjusted EBITDA	0	(1,532)
Corporate
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating income	(36,924)	(28,969)
Stock-based compensation expense	17,082	9,761
Depreciation	2,834	4,893
Amortization of intangibles	0	0
Acquisition-related Contingent Consideration Fair Value Adjustments	0	0
Adjusted EBITDA	$ (17,008)	$ (14,315)

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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