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Organization and Business Description - Additional Information (Details)
shares in Millions, Restaurant in Millions, Hotel in Millions
 3 Months Ended 12 Months Ended
Dec. 11, 2012
shares
Sep. 30, 2019
Visitor
Dec. 31, 2019
Vote / shares
Market
Language
Hotel
VacationRental
Restaurant
ActivityandAttraction
shares
Description Of Business And Basis Of Presentation [Line Items]      
Number of markets with localized versions of website | Market     48
Number of languages worldwide | Language     28
Description of user-generated reviews and opinions across broad base of global travel-related businesses     Tripadvisor features 859 million reviews and opinions on 8.6 million places to stay, places to eat and things to do – including 1.4 million hotels, inns, B&Bs and specialty lodging, 842,000 rental properties, 5.2 million restaurants and 1.2 million travel activities and experiences worldwide.
Number of hotels and accommodations | Hotel     1.4
Number of vacation rentals | VacationRental     842,000
Number of restaurants | Restaurant     5.2
Number of activities and attractions worldwide | ActivityandAttraction     1,200,000
Number of average monthly unique visitors | Visitor   463  
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 | Vote / shares     10
Liberty      
Description Of Business And Basis Of Presentation [Line Items]      
Common stock purchased by Liberty 4.8    
Beneficially ownership of shares of common stock 18.2    
Beneficially ownership of shares of Common Stock Class B 12.8    
Percentage of interest held by related party     100.00%
LTRIP      
Description Of Business And Basis Of Presentation [Line Items]      
Beneficially ownership of shares of common stock     18.2
Percentage taken from outstanding shares of common stock     14.60%
Percentage of beneficially ownership of shares of common stock class B     22.50%
Right to voting     one vote per share
Vote per common stock share | Vote / shares     1
Beneficially ownership of equity securities     57.90%
LTRIP | Class B Common Stock      
Description Of Business And Basis Of Presentation [Line Items]      
Beneficially ownership of shares of common stock     12.8
Percentage taken from outstanding shares of common stock     100.00%
Right to voting     ten votes per share
Vote per common stock share | Vote / shares     10