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BENEFIT PLANS (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] |  |  |
Maximum contribution by employees as a percentage of pre-tax earnings | 50.00% |  |
Generally the maximum amount a participant may contribute in accordance with statutory limits | $ 18,000 | $ 18,000 | $ 17,500
Matching contribution by employer per dollar of contribution by participant | $ 0.50 |  |
Maximum contribution by employer (as a percent) | 6.00% |  |
Requisite service period for matching contribution | 3 years |  |
Vesting of employer matching contribution prior to requisite service period (as a percent) | 0.00% |  |
Vesting of employer matching contribution after requisite service period (as a percent) | 100.00% |  |
Matching contribution made by the entity | $ 700,000 | $ 500,000 | $ 500,000

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- Definition The limit of annual employee contributions to the plan per calendar year as a percentage of compensation. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Generally, the maximum amount an employee may contribute to a defined contribution plan for the calendar year in accordance with statutory limits. + References No definition available. + Details
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- Definition Represents maximum amount by the terms of the plan, that the employer may contribute for each dollar to a defined contribution plan. + References No definition available. + Details
Name: | tree_DefinedContributionPlanEmployerMatchingContributionPerParticipantDollarContributed
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Definition The requisite service period for eligibility for matching contribution by the employer. + References No definition available. + Details
Name: | tree_DefinedContributionPlanRequisiteServicePeriodForEmployerMatchingContribution
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Balance Type: | na
Period Type: | duration

X
- Definition Represents the vesting of employer matched funds, expressed as a percentage, after the requisite service period. + References No definition available. + Details
Name: | tree_DefinedContributionPlanVestingOfEmployerMatchAfterRequisiteServicePeriod
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Data Type: | num:percentItemType
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- Definition Represents the vesting of employer matched funds, expressed as a percentage, prior to the requisite service period. + References No definition available. + Details
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- References No definition available. + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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