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Revenue from contract with customers - Summary of Changes in Contract Liabilities (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Air traffic liability    
Disclosure of changes in contact liabilities [line items]    
Balance at beginning of year $ 611,856 $ 651,805
Sales 3,843,468 3,722,763
Revenue recognition (3,083,778) (3,076,635)
Tax recognition (587,551) (547,206)
Reimbursements (119,844) (84,033)
Interline tickets (35,485) (52,675)
Other (6,771) (2,163)
Balance at end of year 621,895 611,856
Frequent flyer liability    
Disclosure of changes in contact liabilities [line items]    
Balance at beginning of year 124,816 111,526
Deferred of revenue 79,892 65,887
Revenue recognition (72,643) (52,597)
Balance at end of year 132,065 124,816
Current 59,449 55,062
Non-current $ 72,616 $ 69,754