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LONG-TERM DEBT - Exchangeable Notes (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jun. 03, 2019	Dec. 31, 2018	Oct. 02, 2017
Liability component:
Less: unamortized original issue discount	$ (368,976,000)		$ (368,976,000)
Total	3,543,438,000		$ 3,543,438,000
Senior Notes | 2022 Exchangeable Notes
Debt Instrument [Line Items]
Approximate Equivalent Exchange Price per Share (USD per share)			$ 152.18
Senior Notes | 2026 Exchangeable Notes
Debt Instrument [Line Items]
Approximate Equivalent Exchange Price per Share (USD per share)			302.77
Senior Notes | 2030 Exchangeable Notes
Debt Instrument [Line Items]
Approximate Equivalent Exchange Price per Share (USD per share)			$ 291.35
IAC
Liability component:
Principal	1,667,500,000		$ 1,667,500,000			$ 551,989,000
Less: unamortized original issue discount	362,390,000		$ 362,390,000			54,025,000
IAC | Senior Notes
Liability component:
Total							$ 517,500,000
IAC | Senior Notes | 2022 Exchangeable Notes
Debt Instrument [Line Items]
Number of shares of the Company's Common Stock into which each $1,000 of Principal of the Exchangeable Notes is Exchangeable			6.5713
Approximate Equivalent Exchange Price per Share (USD per share)			$ 152.18
Liability component:
Principal	517,500,000		$ 517,500,000			517,500,000
Less: unamortized original issue discount	44,259,000		44,259,000			54,025,000
Total	473,241,000		473,241,000			463,475,000
Equity component	70,363,000		70,363,000			70,363,000
Interest expense recognized related to the Exchangeable Notes
Contractual interest expense	1,132,000	$ 1,138,000	3,396,000	$ 3,396,000
Amortization of original issue discount	3,006,000	3,299,000	9,765,000	9,802,000
Amortization of debt issuance costs	375,000	865,000	2,117,000	2,619,000
Total interest expense recognized	$ 4,513,000	$ 5,302,000	$ 15,278,000	$ 15,817,000
IAC | Senior Notes | 2022 Exchangeable Notes | Exchangeable Notes Hedge
Exchangeable Notes Hedges and Warrants
Number of Shares	3,400,000		3,400,000
Approximate Equivalent Exchange Price/Strike Price per Share (USD per share)	$ 152.18		$ 152.18
IAC | Senior Notes | 2022 Exchangeable Notes | Exchangeable Notes Warrants
Exchangeable Notes Hedges and Warrants
Number of Shares	3,400,000		3,400,000
Approximate Equivalent Exchange Price/Strike Price per Share (USD per share)	$ 229.70		$ 229.70
IAC | Senior Notes | 2026 Exchangeable Notes
Debt Instrument [Line Items]
Number of shares of the Company's Common Stock into which each $1,000 of Principal of the Exchangeable Notes is Exchangeable			3.3028
Approximate Equivalent Exchange Price per Share (USD per share)			$ 302.77
Liability component:
Principal	$ 575,000,000		$ 575,000,000			0
Less: unamortized original issue discount	133,188,000		133,188,000
Total	441,812,000		441,812,000
Equity component	138,796,000		138,796,000
Interest expense recognized related to the Exchangeable Notes
Contractual interest expense	1,258,000		1,705,000
Amortization of original issue discount	4,109,000		5,608,000
Amortization of debt issuance costs	294,000		425,000
Total interest expense recognized	$ 5,661,000		$ 7,738,000
IAC | Senior Notes | 2026 Exchangeable Notes | Exchangeable Notes Hedge
Exchangeable Notes Hedges and Warrants
Number of Shares	1,900,000		1,900,000
Approximate Equivalent Exchange Price/Strike Price per Share (USD per share)	$ 302.77		$ 302.77
IAC | Senior Notes | 2026 Exchangeable Notes | Exchangeable Notes Warrants
Exchangeable Notes Hedges and Warrants
Number of Shares	1,900,000		1,900,000
Approximate Equivalent Exchange Price/Strike Price per Share (USD per share)	$ 457.02		$ 457.02
IAC | Senior Notes | 2030 Exchangeable Notes
Debt Instrument [Line Items]
Number of shares of the Company's Common Stock into which each $1,000 of Principal of the Exchangeable Notes is Exchangeable			3.4323
Approximate Equivalent Exchange Price per Share (USD per share)			$ 291.35
Liability component:
Principal	$ 575,000,000		$ 575,000,000			$ 0
Less: unamortized original issue discount	184,943,000		184,943,000
Total	390,057,000		390,057,000		$ 75,000,000
Equity component	189,213,000		189,213,000
Interest expense recognized related to the Exchangeable Notes
Contractual interest expense	2,875,000		3,897,000
Amortization of original issue discount	3,124,000		4,270,000
Amortization of debt issuance costs	148,000		233,000
Total interest expense recognized	$ 6,147,000		$ 8,400,000
IAC | Senior Notes | 2030 Exchangeable Notes | Exchangeable Notes Hedge
Exchangeable Notes Hedges and Warrants
Number of Shares	2,000,000.0		2,000,000.0
Approximate Equivalent Exchange Price/Strike Price per Share (USD per share)	$ 291.35		$ 291.35
IAC | Senior Notes | 2030 Exchangeable Notes | Exchangeable Notes Warrants
Exchangeable Notes Hedges and Warrants
Number of Shares	2,000,000.0		2,000,000.0
Approximate Equivalent Exchange Price/Strike Price per Share (USD per share)	$ 457.02		$ 457.02

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