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v3.20.4

SIGNIFICANT ACCOUNTING POLICIES - Schedule of depreciation period for each asset category (Details ) | 12 Months Ended
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Dec. 31, 2020
Computer equipment and capitalized software | Minimum |
Property, Plant and Equipment [Line Items] |
Depreciation period | 1 year
Computer equipment and capitalized software | Maximum |
Property, Plant and Equipment [Line Items] |
Depreciation period | 5 years
Furniture and other equipment |
Property, Plant and Equipment [Line Items] |
Depreciation period | 7 years
Aircraft and automobile | Minimum |
Property, Plant and Equipment [Line Items] |
Depreciation period | 5 years
Aircraft and automobile | Maximum |
Property, Plant and Equipment [Line Items] |
Depreciation period | 10 years
Software development | Minimum |
Property, Plant and Equipment [Line Items] |
Depreciation period | 1 year
Software development | Maximum |
Property, Plant and Equipment [Line Items] |
Depreciation period | 5 years

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=tree_ComputerEquipmentandCapitalizedSoftwareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_AutomobilesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_SoftwareDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |