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RESTRICTED CASH RESTRICTED CASH (Details - Balance Sheet) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Restricted Cash and Cash Equivalents      
Restricted cash and cash equivalents $ 18,617us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue   $ 18,716us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Decrease (increase) in Restricted Cash 100us-gaap_IncreaseDecreaseInRestrictedCash 1,954us-gaap_IncreaseDecreaseInRestrictedCash  
Cash in Escrow for Surety Bonds      
Restricted Cash and Cash Equivalents      
Restricted cash and cash equivalents 2,453us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= tree_EscrowDepositForSuretyBondsMember
  2,453us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= tree_EscrowDepositForSuretyBondsMember
Cash in Escrow for Corporate Purchasing Card Program      
Restricted Cash and Cash Equivalents      
Restricted cash and cash equivalents 0us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= tree_EscrowDepositForCorporatePurchasingCardProgramMember
  100us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= tree_EscrowDepositForCorporatePurchasingCardProgramMember
Cash in escrow for sale of LendingTree Loans      
Restricted Cash and Cash Equivalents      
Restricted cash and cash equivalents 16,107us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= tree_EscrowDepositForSaleOfLTLMember
  16,106us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= tree_EscrowDepositForSaleOfLTLMember
Other Restricted Cash and Cash Equivalents      
Restricted Cash and Cash Equivalents      
Restricted cash and cash equivalents 57us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= tree_OtherRestrictedCashAndCashEquivalentsMember
  57us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= tree_OtherRestrictedCashAndCashEquivalentsMember
Cash Restricted for Loan Loss Obligations      
Restricted Cash and Cash Equivalents      
Decrease (increase) in Restricted Cash     $ (3,100)us-gaap_IncreaseDecreaseInRestrictedCash
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= tree_EscrowDepositForLoanLossObligationsMember