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Property and equipment - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
USD ($)
aircraft
flight
Dec. 31, 2024
USD ($)
aircraft
Dec. 31, 2023
USD ($)
Disclosure of detailed information about property, plant and equipment [line items]      
Average duration of long-term lease agreement 16 years    
Gain on engine exchange transactions $ 20,700    
Advance payments on aircraft purchase contracts and others $ 251,430 $ 0 $ 200,000
Number of new aircrafts grounded | aircraft 21    
Number of flights canceled | flight 1,788    
Capitalized expenditure improvements during the year $ 3,100 6,700  
Aircraft      
Disclosure of detailed information about property, plant and equipment [line items]      
Carrying value pledged as collateral obligation 1,900,000 1,700,000  
Payments from contracts held for dealing or trading purpose 301,600 $ 14,000  
Advance payments on aircraft purchase contracts and others $ 251,400    
B-737-Max      
Disclosure of detailed information about property, plant and equipment [line items]      
Number of aircraft capitalized | aircraft 12 6  
Average duration of long-term lease agreement 10 years