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RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Related Party Transactions [Abstract] |  |  |  |
Charitable contribution | $ 10,000 |  |  |
Contribution to LendingTree Foundation |  | $ 3,333 | $ 3,333 | $ 3,300

X
- Definition Charitable Contribution + References No definition available. + Details
Name: | tree_CharitableContribution
Namespace Prefix: | tree_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Charitable Contribution Accrual, Current + References No definition available. + Details
Name: | tree_CharitableContributionAccrualCurrent
Namespace Prefix: | tree_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration