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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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