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Related Parties - Summary of Transactions with Subsidiaries (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Transactions                      
Other operating expenses $ 18,120 $ 15,020 $ 10,308 $ 7,627 $ 65,793 $ 40,273 $ 38,072 $ 41,263 $ 51,075 $ 185,401 $ 133,295
Trip.com and its Subsidiaries [Member]                      
Transactions                      
Commission received                 11 190  
Commission paid                 61 1,087  
Other operating expenses                 284 1,556  
Trip.com and its Subsidiaries [Member] | Air Ticketing [Member]                      
Transactions                      
Sale (refund) of air ticketing [1]                 (14) 1,241  
Purchase (refund) of air ticketing [1]                 (659) 21,610  
Trip.com and its Subsidiaries [Member] | Hotels and Packages [Member]                      
Transactions                      
Sale of hotel and packages [1]                 425 7,734  
Purchase of hotel and packages [1]                 $ 647 $ 6,451  
[1] represents gross amount booked/charged for the air ticketing and hotels and packages transactions