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Property and equipment - Additional Information (Detail)
$ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2024
USD ($)
aircraft
Dec. 31, 2023
USD ($)
aircraft
Sep. 26, 2022
USD ($)
aircraft
Mar. 31, 2022
T
Dec. 31, 2024
USD ($)
aircraft
flight
Dec. 31, 2023
USD ($)
aircraft
Disclosure of detailed information about property, plant and equipment [line items]            
Average lease term         15 years  
Asset recognized from insurance reimbursement $ 0.2 $ 11.5 $ 11.5      
Number of new aircrafts grounded | aircraft         21  
Number of flights canceled | flight         1,788  
Capitalized expenditure improvements during the year         $ 6.7 $ 0.6
B-737-Max            
Disclosure of detailed information about property, plant and equipment [line items]            
Number of aircraft capitalized | aircraft 6 8     6 8
Average lease term         10 years  
Boeing 737-800 BCF            
Disclosure of detailed information about property, plant and equipment [line items]            
Capacity per aircraft | T       21.70    
B-737-800            
Disclosure of detailed information about property, plant and equipment [line items]            
Number of aircrafts damaged | aircraft     1      
Aircraft            
Disclosure of detailed information about property, plant and equipment [line items]            
Carrying value pledged as collateral obligation $ 1,700.0 $ 1,500.0     $ 1,700.0 $ 1,500.0
Additions purchase deposits         $ 14.0 200.2
Additions for advance payments contracts           $ 200.0
Aircraft | Boeing 737-800 BCF            
Disclosure of detailed information about property, plant and equipment [line items]            
Useful life of aircraft       10 years