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THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) segment $ / shares shares | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Class of Stock |  |  |  |  |  |
Number of operating segments | segment | 1 |  |  |  |  |
Cash received per share in transaction (USD per share) | $ / shares | $ 3.00 |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Transition Option Elected [Extensible List] | us-gaap:AccountingStandardsUpdate201604CumulativeEffectPeriodOfAdoptionMember |  |  |  |  |
Stockholders' equity | $ | $ (1,442,561,000) | $ (1,707,838,000) | $ 3,898,318,000 | $ 3,805,761,000 | $ 3,843,597,000 | $ 3,551,801,000
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Class of Stock |  |  |  |  |  |
Stockholders' equity | $ |  |  | $ 0 |  |  |
New Match Common Stock |  |  |  |  |  |
Class of Stock |  |  |  |  |  |
Stock issued in transaction per parent company share (shares) | shares | 1 |  |  |  |  |
Cash received per share in transaction (USD per share) | $ / shares | $ 3.00 |  |  |  |  |

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