Business Description and Basis of Presentation - Additional Information (Details) Restaurant in Millions, Hotel in Millions	6 Months Ended
	Jun. 30, 2019 Market Language Hotel VacationRental Restaurant ActivityandAttraction
Accounting Policies [Abstract]
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 approximately 795 million reviews and opinions on approximately 8.4 million places to stay, places to eat and things to do – including 1.4 million hotels, inns, B&Bs and specialty lodging, 900,000 rental properties, 5.0 million restaurants and 1.1 million travel activities and experiences worldwide.
Number of hotels and accommodations | Hotel	1.4
Number of vacation rentals | VacationRental	900,000
Number of restaurants | Restaurant	5.0
Number of activities and attractions worldwide | ActivityandAttraction	1,100,000