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Related Party Transactions - Additional Information (Details)
0 Months Ended 12 Months Ended
Dec. 11, 2012
Dec. 31, 2014
Dec. 31, 2013
Liberty      
Related Party Transaction [Line Items]      
Common stock purchased by Liberty 4,799,848trip_CommonSharesPurchasedByRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= trip_LibertyMember
   
Beneficially ownership of shares of common stock 18,159,752trip_CommonStockSharesHeldByRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= trip_LibertyMember
   
Percentage of interest held by related party   100.00%trip_ShareOwnershipOfRegistrantOwnedByPreviousRelatedPartyTransferredToCurrentRelatedPartyDuringThePeriod
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= trip_LibertyMember
100.00%trip_ShareOwnershipOfRegistrantOwnedByPreviousRelatedPartyTransferredToCurrentRelatedPartyDuringThePeriod
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= trip_LibertyMember
LTRIP      
Related Party Transaction [Line Items]      
Beneficially ownership of shares of common stock   18,159,752trip_CommonStockSharesHeldByRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= trip_LTRIPMember
 
Percentage taken from outstanding shares of common stock   14.00%trip_PercentOfCommonStockHeldByRelatedPartyCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= trip_LTRIPMember
 
Percentage of beneficially ownership of shares of common stock   21.70%trip_PercentOfCommonStockHeldByRelatedPartyIfClassBConverted
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= trip_LTRIPMember
 
Right to voting   one vote per share  
Beneficially ownership of equity securities   56.60%trip_RelatedPartyVotingRightsPercentCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= trip_LTRIPMember
 
Class B Common Stock      
Related Party Transaction [Line Items]      
Right to voting   10 votes per share  
Class B Common Stock | Liberty      
Related Party Transaction [Line Items]      
Beneficially ownership of shares of common stock     12,799,999trip_CommonStockSharesHeldByRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= trip_LibertyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Class B Common Stock | LTRIP      
Related Party Transaction [Line Items]      
Beneficially ownership of shares of common stock   12,799,999trip_CommonStockSharesHeldByRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= trip_LTRIPMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
 
Percentage taken from outstanding shares of common stock   100.00%trip_PercentOfCommonStockHeldByRelatedPartyCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= trip_LTRIPMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
 
Right to voting   Ten votes per share  
Common Stock      
Related Party Transaction [Line Items]      
Right to voting   one vote per share  
Common Stock | Liberty      
Related Party Transaction [Line Items]      
Beneficially ownership of shares of common stock     18,159,752trip_CommonStockSharesHeldByRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= trip_LibertyMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember