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DEBT - Convertible Senior Notes Narrative (Details) |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 24, 2020 USD ($) day $ / shares Rate shares | May 31, 2017 USD ($) day Rate | Mar. 31, 2022 USD ($) day Rate | Mar. 31, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2021 USD ($) | May 31, 2017 | May 31, 2017 shares | May 31, 2017 $ / shares | May 31, 2017 Rate
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization of debt issuance costs |  |  | $ 2,467,000 | $ 1,275,000 |  |  |  |  |  |
Amortization of debt discount |  |  | 879,000 | 7,346,000 |  |  |  |  |  |
2025 Convertible Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Initial conversion rate, shares per $1,000 principal amount of notes | shares | 2.1683 |  |  |  |  |  |  |  |  |
Initial conversion price per share (in dollars per share) | $ / shares | $ 461.19 |  |  |  |  |  |  |  |  |
Cash repurchase at a price equal to the principal amount of the notes, percentage | Rate | 100.00% |  |  |  |  |  |  |  |  |
Nonconvertible debt borrowing rate at the date of issuance | Rate | 5.30% |  |  |  |  |  |  |  |  |
Debt component of the principal amount | $ 455,600,000 |  |  |  |  |  |  |  |  |
Equity component of the principal amount | 119,400,000 |  |  |  |  |  |  |  |  |
Financing costs | 15,100,000 |  |  |  |  |  |  |  |  |
Debt issuance costs | 12,000,000 |  | 10,019,000 |  |  | $ 8,855,000 |  |  |  |
Debt issuance costs, equity component | $ 3,100,000 |  |  |  |  |  |  |  |  |
Interest expense |  |  | 1,500,000 | 6,800,000 |  |  |  |  |  |
Interest expense recognized associated with the coupon rate |  |  | 700,000 | 700,000 |  |  |  |  |  |
Annual interest rate on convertible senior notes | 0.50% |  |  |  |  |  |  |  |  |
Amortization of debt issuance costs |  |  | $ 800,000 | 600,000 |  |  |  |  |  |
Amortization of debt discount |  |  |  | 5,500,000 |  |  |  |  |  |
2025 Convertible Notes | Conversion option one |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Threshold trading days | day | 20 |  |  |  |  |  |  |  |  |
Threshold consecutive trading days | day | 30 |  | 30 |  |  |  |  |  |  |
Conversion rate, sales price of common stock as a percentage of the conversion price | Rate | 130.00% |  | 130.00% |  |  |  |  |  |  |
2025 Convertible Notes | Conversion option two |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Threshold trading days | day | 5 |  |  |  |  |  |  |  |  |
Threshold consecutive trading days | day | 5 |  |  |  |  |  |  |  |  |
Conversion rate | Rate | 98.00% |  |  |  |  |  |  |  |  |
2025 Convertible Notes | Convertible Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 575,000,000 |  |  |  |  |  |  |  |  |
Stated interest rate | 0.50% |  | 0.50% |  |  |  |  |  |  |
Fair value |  |  | $ 471,500,000 |  |  |  |  |  |  |
2025 Notes Under 13-day Purchase Option | Convertible Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 75,000,000 |  |  |  |  |  |  |  |  |
2022 Convertible Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 300,000,000 |  |  |  |  |  |  |  |
Stated interest rate | Rate |  |  |  |  |  |  |  |  |  | 0.625%
Initial conversion rate, shares per $1,000 principal amount of notes | shares |  |  |  |  |  |  |  | 4.8163 |  |
Initial conversion price per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 207.63 |
Cash repurchase at a price equal to the principal amount of the notes, percentage | Rate |  | 100.00% |  |  |  |  |  |  |  |
Nonconvertible debt borrowing rate at the date of issuance |  |  |  |  |  |  | 5.36% |  |  |
Debt component of the principal amount |  | $ 238,400,000 |  |  |  |  |  |  |  |
Equity component of the principal amount |  | 61,600,000 |  |  |  |  |  |  |  |
Financing costs |  | 9,300,000 |  |  |  |  |  |  |  |
Debt issuance costs |  | 7,400,000 | 175,000 |  |  | $ 391,000 |  |  |  |
Debt issuance costs, equity component |  | $ 1,900,000 |  |  |  |  |  |  |  |
Interest expense |  |  | 500,000 | 2,300,000 |  |  |  |  |  |
Interest expense recognized associated with the coupon rate |  |  | 300,000 | 300,000 |  |  |  |  |  |
Annual interest rate on convertible senior notes |  |  |  |  |  |  | 0.625% |  |  | 0.625%
Amortization of debt issuance costs |  |  | 200,000 | 200,000 |  |  |  |  |  |
Amortization of debt discount |  |  |  | $ 1,800,000 |  |  |  |  |  |
Fair value |  |  | $ 168,400,000 |  |  |  |  |  |  |
Repayments of convertible debt | 234,000,000 |  |  |  |  |  |  |  |  |
Debt repurchase amount | 130,300,000 |  |  |  |  |  |  |  |  |
Debt repurchased amount, accrued interest | 100,000 |  |  |  |  |  |  |  |  |
Extinguishment of debt | 126,000,000 |  |  |  |  |  |  |  |  |
Repurchase of 0.625% Convertible Senior Notes, net | $ 107,900,000 |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  | $ 7,800,000 |  |  |  |  |
2022 Convertible Notes | Conversion option one |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Threshold trading days | day |  | 20 |  |  |  |  |  |  |  |
Threshold consecutive trading days | day |  | 30 |  |  |  |  |  |  |  |
Conversion rate, sales price of common stock as a percentage of the conversion price | Rate |  | 130.00% |  |  |  |  |  |  |  |
2022 Convertible Notes | Conversion option two |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Threshold trading days | day |  | 5 |  |  |  |  |  |  |  |
Threshold consecutive trading days | day |  | 5 |  |  |  |  |  |  |  |
Conversion rate | Rate |  | 98.00% |  |  |  |  |  |  |  |
2022 Convertible Notes | Convertible Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 0.625% |  |  |  |  |  |  |

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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
Name: | us-gaap_RepaymentsOfConvertibleDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_DebtInstrumentAxis=tree_A2025ConvertibleNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=tree_A2025NotesUnder13dayPurchaseOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=tree_A2022ConvertibleNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |