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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator: Basic
Net earnings	$ 159,772	$ 171,577	$ 419,548	$ 540,270
Net earnings attributable to noncontrolling interests	(31,228)	(25,803)	(88,842)	(105,061)
Net earnings attributable to IAC shareholders	128,544	145,774	330,706	435,209
Numerator: Diluted
Net earnings	159,772	171,577	419,548	540,270
Net earnings attributable to noncontrolling interests	(31,228)	(25,803)	(88,842)	(105,061)
Impact from publicly-traded subsidiaries' dilutive securities	(7,342)	(8,336)	(20,174)	(19,490)
Net earnings attributable to IAC shareholders	$ 121,202	$ 137,438	$ 310,532	$ 415,719
Denominator: Basic
Weighted average basic shares outstanding (shares)	84,393	83,433	84,147	83,342
Denominator: Diluted
Weighted average basic shares outstanding (shares)	84,393	83,433	84,147	83,342
Dilutive securities (shares)	5,095	8,542	5,799	8,076
Denominator for earnings per share - weighted average shares (shares)	89,488	91,975	89,946	91,418
Earnings per share attributable to IAC shareholders: Basic
Earnings per share (USD per share)	$ 1.52	$ 1.75	$ 3.93	$ 5.22
Earnings per share attributable to IAC shareholders: Diluted
Earnings per share (USD per share)	1.35	1.49	3.45	4.55
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Average share price (USD per share)	$ 238.90	$ 181.60	$ 223.32	$ 160.85
Stock options, warrants, and subsidiary denominated equity exchange of Exchangeable Notes and vesting of RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from calculation of diluted earnings per share (less than or equal to) (shares)	7,700	3,400	11,200	3,400
Market-based awards and PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from calculation of diluted earnings per share (less than or equal to) (shares)	300	200	300	200
Senior Notes | 2022 Exchangeable Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from calculation of diluted earnings per share (less than or equal to) (shares)	1,200	600	1,100	200
Exchange price per share (USD per share)			$ 152.18
Senior Notes | 2026 Exchangeable Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exchange price per share (USD per share)			302.77
Senior Notes | 2030 Exchangeable Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exchange price per share (USD per share)			$ 291.35

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