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DISCONTINUED OPERATIONS (Details LTL FV Gain on Derivatives) (Lending Tree Loans, Discontinued operations, USD $)
 12 Months Ended
Dec. 31, 2012
Gain recognized in the consolidated statements of operations for derivatives  
Gain/(Loss) recognized in Income on Derivative $ 77,622,000us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Interest Rate Lock Commitments  
Gain recognized in the consolidated statements of operations for derivatives  
Gain/(Loss) recognized in Income on Derivative 73,378,000us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= tree_LendingTreeLoansMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
Forward Delivery Contracts  
Gain recognized in the consolidated statements of operations for derivatives  
Gain/(Loss) recognized in Income on Derivative 4,244,000us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= tree_LendingTreeLoansMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
Loans Held for Sale  
Gain recognized in the consolidated statements of operations for derivatives  
Gain due to change in fair value of loans held for sale $ 2,700,000us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_BalanceSheetLocationAxis
= tree_LoansHeldForSaleMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= tree_LendingTreeLoansMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember