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Related Party Transactions - Additional Information (Details) (LTRIP, USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Related Party Transaction [Line Items]    
Beneficially ownership of shares of common stock 18,159,752trip_CommonStockSharesHeldByRelatedParty  
Percentage taken from outstanding shares of common stock 13.90%trip_PercentOfCommonStockHeldByRelatedPartyCurrent  
Percentage of beneficially ownership of shares of common stock 21.60%trip_PercentOfCommonStockHeldByRelatedPartyIfClassBConverted  
Right to voting one vote per share  
Beneficially ownership of equity securities 56.50%trip_RelatedPartyVotingRightsPercentCurrent  
Related party transactions $ 0us-gaap_RelatedPartyTransactionAmountsOfTransaction $ 0us-gaap_RelatedPartyTransactionAmountsOfTransaction
Class B Common Stock
    
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