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LONG-TERM DEBT - Narrative (Details) |  |  |  |  |  | 9 Months Ended | 12 Months Ended | 31 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 23, 2019 USD ($) | May 21, 2019 USD ($) | Dec. 31, 2018 USD ($) | Nov. 05, 2018 USD ($) | Oct. 02, 2017 USD ($) | Sep. 30, 2019 USD ($) | Nov. 05, 2023 USD ($) | Nov. 05, 2022 USD ($) | Dec. 31, 2018 USD ($) | Nov. 05, 2021 USD ($) | Jun. 03, 2019 USD ($) | Feb. 15, 2019 USD ($) | Dec. 04, 2017 | Jun. 01, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding balance of debt instrument |  |  |  |  |  | $ 3,543,438,000 |  |  |  |  |  |  |  |
Net unamortized discount (premium) |  |  |  |  |  | (368,976,000) |  |  |  |  |  |  |  |
Cash And Cash Equivalents And Marketable Securities |  |  |  |  |  | 2,300,000,000 |  |  |  |  |  |  |  |
IAC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unamortized discount (premium) |  |  | $ 54,025,000 |  |  | 362,390,000 |  |  | $ 54,025,000 |  |  |  |  |
Debt redeemed |  |  | 551,989,000 |  |  | 1,667,500,000 |  |  | 551,989,000 |  |  |  |  |
IAC Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding of credit facility |  |  | $ 0 |  |  | $ 0 |  |  | $ 0 |  |  |  |  |
Annual commitment fee on undrawn funds, basis points (as a percent) |  |  |  |  |  | 0.20% |  |  | 0.20% |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |
IAC Credit Facility | Maximum | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum leverage ratio |  |  | 2.75 |  |  | 3.25 |  |  |  |  |  |  |  |
Match Group |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unamortized discount (premium) |  |  | $ 7,352,000 |  |  | $ 6,586,000 |  |  | $ 7,352,000 |  |  |  |  |
Debt redeemed |  |  | 1,535,000,000 |  |  | $ 1,625,000,000 |  |  | $ 1,535,000,000 |  |  |  |  |
Match Group | MTCH Term Loan due November 16, 2022 | Maximum | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio limiting ability to pay dividends, make distributions, or repurchase stock |  |  |  |  |  | 4.0 |  |  |  |  |  |  |  |
Match Group | MTCH Credit Facility due December 7, 2023 | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual commitment fee on undrawn funds, basis points (as a percent) |  |  |  |  |  | 0.25% |  |  | 0.25% |  |  |  |  |
Match Group | MTCH Credit Facility due December 7, 2023 | Maximum | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio limiting ability to pay dividends, make distributions, or repurchase stock |  |  |  |  |  | 2.0 |  |  |  |  |  |  |  |
ANGI Homeservices | ANGI Homeservices Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding of credit facility |  |  | 0 |  |  | $ 0 |  |  | $ 0 |  |  |  |  |
Annual commitment fee on undrawn funds, basis points (as a percent) |  |  |  |  |  | 0.25% |  |  | 0.25% |  |  |  |  |
Debt instrument term |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |
Senior Notes | IAC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding balance of debt instrument |  |  |  |  | $ 517,500,000 |  |  |  |  |  |  |  |  |
Senior Notes | 6.375% MTCH Senior Notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum leverage ratio |  |  |  |  |  | 5.0 |  |  |  |  |  |  |  |
Senior Notes | 0.875% Exchangeable Notes due 2026 & 2.00% Exchangeable Notes due 2030 | IAC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt after fees and expenses |  | $ 1,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Net unamortized discount (premium) |  | $ (136,900,000) |  |  |  |  |  |  |  |  |  |  |  |
Period of reported sale price of common stock (trading days) |  |  |  |  |  | 5 days |  |  |  |  |  |  |  |
Period of consecutive reported sale price of common stock (trading days) |  |  |  |  |  | 5 days |  |  |  |  |  |  |  |
Senior Notes | 2026 Exchangeable Notes | IAC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  | 0.875% |  |  |  |  |  |  |  |
Outstanding balance of debt instrument |  |  |  |  |  | $ 441,812,000 |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  |  | 5.35% |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  |  |  |  | $ 575,000,000.0 |  |  |  |  |  |  |  |
Net unamortized discount (premium) |  |  |  |  |  | 133,188,000 |  |  |  |  |  |  |  |
Debt redeemed |  |  | 0 |  |  | $ 575,000,000 |  |  | $ 0 |  |  |  |  |
Senior Notes | 2030 Exchangeable Notes | IAC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |
Outstanding balance of debt instrument |  |  |  |  |  | $ 390,057,000 |  |  |  |  | $ 75,000,000 |  |  |
Effective interest rate (as a percent) |  |  |  |  |  | 6.59% |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  |  |  |  | $ 575,000,000.0 |  |  |  |  |  |  |  |
Net unamortized discount (premium) |  |  |  |  |  | 184,943,000 |  |  |  |  |  |  |  |
Debt redeemed |  |  | 0 |  |  | $ 575,000,000 |  |  | 0 |  |  |  |  |
Senior Notes | 2022 Exchangeable Notes | IAC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  | 0.875% |  |  |  |  |  |  |  |
Outstanding balance of debt instrument |  |  | 463,475,000 |  |  | $ 473,241,000 |  |  | 463,475,000 |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  |  | 4.73% |  |  |  |  |  |  |  |
Net unamortized discount (premium) |  |  | 54,025,000 |  |  | $ 44,259,000 |  |  | 54,025,000 |  |  |  |  |
Period of reported sale price of common stock (trading days) |  |  |  |  | 20 days | 5 days |  |  |  |  |  |  |  |
Period of consecutive reported sale price of common stock (trading days) |  |  |  |  | 30 days | 5 days |  |  |  |  |  |  |  |
Exchange price on applicable trading day (as a percent) |  |  |  |  | 130.00% |  |  |  |  |  |  |  |  |
Amount of product relative to last reported price (as a percent) |  |  |  |  | 98.00% |  |  |  |  |  |  |  |  |
If-converted value in excess of principal |  |  |  |  |  | $ 223,700,000 |  |  | 105,000,000.0 |  |  |  |  |
Debt redeemed |  |  | $ 517,500,000 |  |  | $ 517,500,000 |  |  | $ 517,500,000 |  |  |  |  |
Senior Notes | 4.75% Senior Notes | IAC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  | 4.75% |  |  | 4.75% |  |  | 4.75% |  |  |  |  |
Debt redeemed |  |  | $ 34,489,000 |  |  | $ 0 |  |  | $ 34,489,000 |  |  |  |  |
Premium for debt redeemed | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued interest paid | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | Match Group | 6.375% MTCH Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  | 6.375% |  |  |  |  |  |  |  | 6.375%
Debt redeemed |  |  | 400,000,000 |  |  | $ 400,000,000 |  |  | 400,000,000 |  |  |  |  |
Senior Notes | Match Group | 5.00% MTCH Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  | 5.00% |  |  |  |  |  |  | 5.00% |
Debt redeemed |  |  | 450,000,000 |  |  | $ 450,000,000 |  |  | 450,000,000 |  |  |  |  |
Senior Notes | Match Group | 5.625% MTCH Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  | 5.625% |  |  |  |  |  | 5.625% |  |
Debt redeemed |  |  | 0 |  |  | $ 350,000,000 |  |  | 0 |  |  | $ 350,000,000 |  |
Senior Notes | IAC FinanceCo 2, Inc.& IAC FinanceCo 3, Inc. | 0.875% Exchangeable Notes due 2026 & 2.00% Exchangeable Notes due 2030 | IAC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of reported sale price of common stock (trading days) |  | 20 days |  |  |  |  |  |  |  |  |  |  |  |
Period of consecutive reported sale price of common stock (trading days) |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |
Exchange price on applicable trading day (as a percent) |  | 130.00% |  |  |  |  |  |  |  |  |  |  |  |
Redemption price (as a percent) |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Term Loan | Match Group | MTCH Term Loan due November 16, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding balance of debt instrument |  |  | 425,000,000 |  |  | $ 425,000,000.0 |  |  | $ 425,000,000 |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  | 4.66% |  |  | 5.09% |  |  |  |  |
Debt redeemed |  |  | 425,000,000 |  |  | $ 425,000,000 |  |  | $ 425,000,000 |  |  |  |  |
Term Loan | Match Group | MTCH Term Loan due November 16, 2022 | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |
Term Loan | ANGI Homeservices | ANGI Term Loan due November 5, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding balance of debt instrument |  |  | 261,300,000 |  |  | $ 250,900,000 |  |  | $ 261,300,000 |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  | 3.53% |  |  | 4.00% |  |  |  |  |
Debt redeemed |  |  | 261,250,000 |  |  | $ 250,938,000 |  |  | $ 261,250,000 |  |  |  |  |
Term Loan | ANGI Homeservices | ANGI Term Loan due November 5, 2023 | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly repayments of principal |  |  |  |  |  |  | $ 10,300,000 | $ 6,900,000 |  | $ 3,400,000 |  |  |  |
Final principal payment |  |  |  |  |  |  | $ 161,600,000 |  |  |  |  |  |  |
Term Loan | ANGI Homeservices | ANGI Term Loan due November 5, 2023 | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  | 1.50% |  |  | 1.50% |  |  |  |  |
Term Loan | ANGI Homeservices | ANGI Term Loan due November 5, 2023 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum leverage ratio |  |  |  |  |  | 4.5 |  |  |  |  |  |  |  |
Leverage ratio limiting ability to pay dividends, make distributions, or repurchase stock |  |  |  |  |  | 4.25 |  |  |  |  |  |  |  |
Term Loan | ANGI Homeservices | ANGI Term Loan due November 5, 2023 | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum interest coverage ratio |  |  |  |  |  | 2.0 |  |  |  |  |  |  |  |
Credit Facility | Match Group | MTCH Credit Facility due December 7, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding balance of debt instrument |  |  | $ 260,000,000.0 |  |  |  |  |  | $ 260,000,000.0 |  |  |  |  |
Borrowings outstanding of credit facility |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  | 4.00% |  |  |  |  |  | 4.00% |  |  |  |  |
Face amount of debt instrument |  |  | $ 500,000,000 |  |  |  |  |  | $ 500,000,000 |  |  |  |  |
Debt redeemed |  |  | $ 260,000,000 |  |  | $ 0 |  |  | $ 260,000,000 |  |  |  |  |
Credit Facility | Match Group | MTCH Credit Facility due December 7, 2023 | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  |  |  |  | 1.50% |  |  |  |  |
Credit Facility | Match Group | MTCH Credit Facility due December 7, 2023 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum leverage ratio |  |  |  |  |  | 5.0 |  |  |  |  |  |  |  |
Credit Facility | Match Group | MTCH Credit Facility due December 7, 2023 | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum interest coverage ratio |  |  |  |  |  | 2.0 |  |  |  |  |  |  |  |

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- Definition Debt Instrument, Period of Reported Sale Price of Common Stock + References No definition available. + Details
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- Definition Debt Instrument, Redemption, Premium + References No definition available. + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031898-161870 + Details
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