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LONG-TERM DEBT - Exchangeable Notes (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Liability component: |  |  |
Less: unamortized original issue discount | $ 347,306 |  |
Total | $ 4,036,563 |  |
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 |  | $ 1,667,500
Less: unamortized original issue discount | $ 340,688 |  | 351,605
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 (shares) | 6.5713 |  |
Approximate Equivalent Exchange Price per Share (USD per share) | $ 152.18 |  |
Liability component: |  |  |
Principal | $ 517,500 |  | 517,500
Less: unamortized original issue discount | 37,314 |  | 40,768
Total | 480,186 |  | 476,732
Equity component | 70,363 |  | 70,363
Interest expense recognized related to the Exchangeable Notes |  |  |
Contractual interest expense | 1,132 | $ 1,132 |
Amortization of original issue discount | 3,454 | 3,363 |
Amortization of debt issuance costs | 855 | 871 |
Total interest expense recognized | $ 5,441 | $ 5,366 |
IAC | Senior Notes | 2022 Exchangeable Notes | Exchangeable Notes Hedge |  |  |
Exchangeable Notes Hedges and Warrants |  |  |
Number of Shares | 3,400,000 |  |
Approximate Equivalent Exchange Price/Strike Price per Share (USD per share) | $ 152.18 |  |
IAC | Senior Notes | 2022 Exchangeable Notes | Exchangeable Notes Warrants |  |  |
Exchangeable Notes Hedges and Warrants |  |  |
Number of Shares | 3,400,000 |  |
Approximate Equivalent Exchange Price/Strike Price per Share (USD per share) | $ 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 (shares) | 3.3028 |  |
Approximate Equivalent Exchange Price per Share (USD per share) | $ 302.77 |  |
Liability component: |  |  |
Principal | $ 575,000 |  | 575,000
Less: unamortized original issue discount | 124,820 |  | 129,037
Total | 450,180 |  | 445,963
Equity component | 138,796 |  | 138,796
Interest expense recognized related to the Exchangeable Notes |  |  |
Contractual interest expense | 1,258 |  |
Amortization of original issue discount | 4,217 |  |
Amortization of debt issuance costs | 319 |  |
Total interest expense recognized | $ 5,794 |  |
IAC | Senior Notes | 2026 Exchangeable Notes | Exchangeable Notes Hedge |  |  |
Exchangeable Notes Hedges and Warrants |  |  |
Number of Shares | 1,900,000 |  |
Approximate Equivalent Exchange Price/Strike Price per Share (USD per share) | $ 302.77 |  |
IAC | Senior Notes | 2026 Exchangeable Notes | Exchangeable Notes Warrants |  |  |
Exchangeable Notes Hedges and Warrants |  |  |
Number of Shares | 1,900,000 |  |
Approximate Equivalent Exchange Price/Strike Price per Share (USD per share) | $ 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 (shares) | 3.4323 |  |
Approximate Equivalent Exchange Price per Share (USD per share) | $ 291.35 |  |
Liability component: |  |  |
Principal | $ 575,000 |  | 575,000
Less: unamortized original issue discount | 178,554 |  | 181,800
Total | 396,446 |  | 393,200
Equity component | 189,213 |  | $ 189,213
Interest expense recognized related to the Exchangeable Notes |  |  |
Contractual interest expense | 2,875 |  |
Amortization of original issue discount | 3,246 |  |
Amortization of debt issuance costs | 176 |  |
Total interest expense recognized | $ 6,297 |  |
IAC | Senior Notes | 2030 Exchangeable Notes | Exchangeable Notes Hedge |  |  |
Exchangeable Notes Hedges and Warrants |  |  |
Number of Shares | 2,000,000.0 |  |
Approximate Equivalent Exchange Price/Strike Price per Share (USD per share) | $ 291.35 |  |
IAC | Senior Notes | 2030 Exchangeable Notes | Exchangeable Notes Warrants |  |  |
Exchangeable Notes Hedges and Warrants |  |  |
Number of Shares | 2,000,000.0 |  |
Approximate Equivalent Exchange Price/Strike Price per Share (USD per share) | $ 457.02 |  |

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