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Property and equipment - Summary of Property and Equipment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance $ 2,883,524 $ 2,512,704  
Ending balance 3,238,632 2,883,524 $ 2,512,704
Cost -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 4,070,753 3,576,449 3,115,922
Transfer of pre-delivery payments 0 0 0
Additions 598,059 622,478 435,315
Disposals (59,779) (51,974) (43,206)
Reclassifications (25,400) (76,200) 5,543
Reclassifications from assets held for sale     62,875
Ending balance 4,583,633 4,070,753 3,576,449
Accumulated depreciation and impairment -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance (1,187,229) (1,063,745) (968,436)
Depreciation for the year (209,907) (171,910) (136,343)
Disposals 52,135 48,426 41,034
Ending balance (1,345,001) (1,187,229) (1,063,745)
Land      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 6,301 6,301  
Ending balance 6,301 6,301 6,301
Land | Cost -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 6,301 6,301 6,301
Transfer of pre-delivery payments 0 0 0
Additions 0 0 0
Disposals 0 0 0
Reclassifications 0 0 0
Reclassifications from assets held for sale     0
Ending balance 6,301 6,301 6,301
Land | Accumulated depreciation and impairment -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 0 0 0
Depreciation for the year 0 0 0
Disposals 0 0 0
Ending balance 0 0 0
Flight equipment      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 2,104,450 1,983,550  
Ending balance 2,481,139 2,104,450 1,983,550
Flight equipment | Cost -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 3,167,519 2,925,576 2,538,774
Transfer of pre-delivery payments 211,703 50,977 284,170
Additions 373,983 228,908 75,080
Disposals (56,979) (46,121) (36,351)
Reclassifications (549) 8,179 1,028
Reclassifications from assets held for sale     62,875
Ending balance 3,695,677 3,167,519 2,925,576
Flight equipment | Accumulated depreciation and impairment -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance (1,063,069) (942,026) (849,487)
Depreciation for the year (200,851) (163,674) (127,432)
Disposals 49,382 42,631 34,893
Ending balance (1,214,538) (1,063,069) (942,026)
Purchase deposits for flight equipment      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 732,253 476,254  
Ending balance 700,180 732,253 476,254
Purchase deposits for flight equipment | Cost -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 732,253 476,254 407,814
Transfer of pre-delivery payments (211,703) (50,977) (284,170)
Additions 205,030 383,176 347,010
Disposals 0 0 0
Reclassifications (25,400) (76,200) 5,600
Reclassifications from assets held for sale     0
Ending balance 700,180 732,253 476,254
Purchase deposits for flight equipment | Accumulated depreciation and impairment -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 0 0 0
Depreciation for the year 0 0 0
Disposals 0 0 0
Ending balance 0 0 0
Ramp and miscellaneous      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 8,267 7,785  
Ending balance 9,685 8,267 7,785
Ramp and miscellaneous | Cost -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 55,070 53,562 56,613
Transfer of pre-delivery payments 0 0 0
Additions 3,993 2,903 525
Disposals (427) (1,395) (3,576)
Reclassifications 0 0 0
Reclassifications from assets held for sale     0
Ending balance 58,636 55,070 53,562
Ramp and miscellaneous | Accumulated depreciation and impairment -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance (46,803) (45,777) (46,702)
Depreciation for the year (2,546) (2,392) (2,576)
Disposals 398 1,366 3,501
Ending balance (48,951) (46,803) (45,777)
Furniture, fixtures, equipment and other      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 3,906 1,942  
Ending balance 5,470 3,906 1,942
Furniture, fixtures, equipment and other | Cost -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 32,958 33,905 32,796
Transfer of pre-delivery payments 0 0 0
Additions 3,760 3,318 1,114
Disposals (1,476) (4,265) (140)
Reclassifications 0 0 135
Reclassifications from assets held for sale     0
Ending balance 35,242 32,958 33,905
Furniture, fixtures, equipment and other | Accumulated depreciation and impairment -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance (29,052) (31,963) (30,461)
Depreciation for the year (2,190) (1,354) (1,639)
Disposals 1,470 4,265 137
Ending balance (29,772) (29,052) (31,963)
Leasehold improvements      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 25,966 21,292  
Ending balance 24,242 25,966 21,292
Leasehold improvements | Cost -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 74,267 65,267 67,459
Transfer of pre-delivery payments 0 0 0
Additions 1,991 3,291 290
Disposals (897) (164) (3,139)
Reclassifications 617 5,873 657
Reclassifications from assets held for sale     0
Ending balance 75,978 74,267 65,267
Leasehold improvements | Accumulated depreciation and impairment -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance (48,301) (43,975) (41,782)
Depreciation for the year (4,320) (4,490) (4,696)
Disposals 885 164 2,503
Ending balance (51,736) (48,301) (43,975)
Construction in progress      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 2,381 15,580  
Ending balance 11,615 2,381 15,580
Construction in progress | Cost -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 2,385 15,584 6,165
Transfer of pre-delivery payments 0 0 0
Additions 9,302 882 11,296
Disposals 0 (29) 0
Reclassifications (68) (14,052) (1,877)
Reclassifications from assets held for sale     0
Ending balance 11,619 2,385 15,584
Construction in progress | Accumulated depreciation and impairment -      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance (4) (4) (4)
Depreciation for the year 0 0 0
Disposals 0 0 0
Ending balance $ (4) $ (4) $ (4)