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CONTINGENCIES (Details) (USD $) | 0 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 14, 2011 regulator | Mar. 09, 2015 regulator | Dec. 31, 2014 | Sep. 08, 2010 patent | Jul. 31, 2014 | Dec. 31, 2013 | Mar. 12, 2014 patent
Contingencies |  |  |  |  |  |  |
Accrued litigation liabilities |  |  | $ 2,786,000 us-gaap_LitigationReserve |  |  | $ 500,000 us-gaap_LitigationReserve |
Massachusetts Division of Banks |  |  |  |  |  |  |
Contingencies |  |  |  |  |  |  |
Accrued litigation liabilities |  |  | 500,000 us-gaap_LitigationReserve / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_UnfavorableRegulatoryActionMember |  |  |  |
Range of possible loss, minimum |  |  | 500,000.0 us-gaap_LossContingencyRangeOfPossibleLossMinimum / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_UnfavorableRegulatoryActionMember |  |  |  |
Range of possible loss, maximum |  |  | 6,500,000.0 us-gaap_LossContingencyRangeOfPossibleLossMaximum / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_UnfavorableRegulatoryActionMember |  |  |  |
Number of Joining Regulators | 34 tree_NumberOfJoiningRegulators / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_UnfavorableRegulatoryActionMember |  |  |  |  |  |
Massachusetts Division of Banks | Subsequent event |  |  |  |  |  |  |
Contingencies |  |  |  |  |  |  |
Number of Joining Regulators |  | 0 tree_NumberOfJoiningRegulators / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_UnfavorableRegulatoryActionMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |
Federal Trade Commission [Member] [Domain] |  |  |  |  |  |  |
Contingencies |  |  |  |  |  |  |
Litigation settlement |  |  | 0 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = tree_FederalTradeCommissionMemberDomain |  |  |  |
Pending litigation or appeal | Lending Tree v. Zillow, Inc. |  |  |  |  |  |  |
Contingencies |  |  |  |  |  |  |
Accrued litigation liabilities |  |  | 2,300,000 us-gaap_LitigationReserve / us-gaap_LitigationCaseAxis = tree_LendingTreev.ZillowInc.Member / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember |  |  |  |
Number of patents infringed |  |  |  | 1 tree_NumberofPatentsInfringed / us-gaap_LitigationCaseAxis = tree_LendingTreev.ZillowInc.Member / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember |  |  |
Number of patents found not infringed upon |  |  |  |  |  |  | 2 tree_LossContingencyNumberofPatentsFoundNotInfringedUpon / us-gaap_LitigationCaseAxis = tree_LendingTreev.ZillowInc.Member / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember
Litigation settlement |  |  | 2,300,000 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = tree_LendingTreev.ZillowInc.Member / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember |  |  |  |
Range of possible loss, maximum |  |  | 9,700,000 us-gaap_LossContingencyRangeOfPossibleLossMaximum / us-gaap_LitigationCaseAxis = tree_LendingTreev.ZillowInc.Member / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember |  |  |  |
Pending litigation or appeal | Lijkel Dijkstra v. Harry Carenbauer, Home Loan Center, Inc |  |  |  |  |  |  |
Contingencies |  |  |  |  |  |  |
Accrued litigation liabilities |  |  | 2,800,000 us-gaap_LitigationReserve / us-gaap_LitigationCaseAxis = tree_LijkelDijkstrav.HarryCarenbauerHomeLoanCenterIncMember / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember |  |  |  |
Litigation settlement |  |  |  |  | $ 2,800,000 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = tree_LijkelDijkstrav.HarryCarenbauerHomeLoanCenterIncMember / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember |  |

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- Definition This element represents the number of state mortgage regulation divisions that agree to not pursue litigation as part of an agreement for the company to sign a Consent Agreement and Order. + References No definition available. + Details
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