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Organization and Business Description - Additional Information (Detail)
12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2014
Segment
Country
Brand
Dec. 31, 2011
Company
Dec. 11, 2012
Dec. 31, 2013
Description Of Business And Basis Of Presentation [Line Items]        
Number of separate independent public companies   2trip_NumberOfSeparateIndependentPublicCompanies    
Number of countries with localized versions of website 45trip_NumberOfCountriesWithLocalizedWebsites      
Number of other media brands with websites 24trip_NumberOfOtherTravelBrands      
Number of reportable segment 2us-gaap_NumberOfReportableSegments      
Other Segment        
Description Of Business And Basis Of Presentation [Line Items]        
Number of operating segments 3us-gaap_NumberOfOperatingSegments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
     
Class B Common Stock        
Description Of Business And Basis Of Presentation [Line Items]        
Right to voting 10 votes per share      
Vote per common stock share 10trip_NumberOfVotingRightsPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
     
Liberty        
Description Of Business And Basis Of Presentation [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
Liberty | Class B Common Stock        
Description Of Business And Basis Of Presentation [Line Items]        
Beneficially ownership of shares of common stock       12,799,999trip_CommonStockSharesHeldByRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= trip_LibertyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Beneficially ownership of shares of Common Stock Class B     12,799,999trip_ClassBCommonStockSharesHeldByRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= trip_LibertyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
 
LTRIP        
Description Of Business And Basis Of Presentation [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      
Vote per common stock share 1trip_NumberOfVotingRightsPerShare
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= trip_LTRIPMember
     
Beneficially ownership of equity securities 56.60%trip_RelatedPartyVotingRightsPercentCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= trip_LTRIPMember
     
LTRIP | Class B Common Stock        
Description Of Business And Basis Of Presentation [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
     
Percentage taken from outstanding shares of Class B Common Stock 100.00%trip_PercentOfCommonStockClassBHeldByRelatedPartyCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= trip_LTRIPMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
     
Right to voting Ten votes per share      
Vote per common stock share 10trip_NumberOfVotingRightsPerShare
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= trip_LTRIPMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember