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Property and Equipment - Summary of Property and Equipment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance $ 2,532,402 $ 2,698,131  
Impairment (243,097) (89,344) $ (188,624)
Ending balance 2,147,486 2,532,402 2,698,131
Gross carrying amount [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 3,668,182 4,078,199 3,803,861
Transfer of pre-delivery payments 0 0 0
Additions 44,065 189,491 468,424
Disposals (35,935) (185,831) (27,514)
Assets held for sale (554,790) (413,677) (164,201)
Reclassifications (5,600) 0 (2,371)
Ending balance 3,115,922 3,668,182 4,078,199
Accumulated depreciation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance (1,135,780) (1,380,068) (1,189,645)
Depreciation for the year (139,002) (160,819) (159,307)
Disposals 33,099 178,788 23,769
Assets held for sale 273,251 226,319 75,556
Reclassifications     268
Impairment (4)   (130,709)
Ending balance (968,436) (1,135,780) (1,380,068)
Land [member]      
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 [member] | Gross carrying amount [member]      
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
Assets held for sale 0 0 0
Reclassifications 0 0 0
Ending balance 6,301 6,301 6,301
Land [member] | Accumulated depreciation and impairment [member]      
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
Assets held for sale 0   0
Reclassifications     0
Impairment 0   0
Ending balance 0 0 0
Flight equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 2,010,509 2,165,787  
Ending balance 1,689,287 2,010,509 2,165,787
Flight equipment [member] | Gross carrying amount [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 3,038,594 3,449,527 3,252,229
Transfer of pre-delivery payments 49,860 78,143 156,305
Additions 39,492 109,286 228,302
Disposals (34,626) (184,685) (20,737)
Assets held for sale (554,790) (413,677) (164,201)
Reclassifications 244 0 (2,371)
Ending balance 2,538,774 3,038,594 3,449,527
Flight equipment [member] | Accumulated depreciation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance (1,028,085) (1,283,740) (1,097,751)
Depreciation for the year (126,988) (148,832) (147,980)
Disposals 32,335 178,168 16,876
Assets held for sale 273,251 226,319 75,556
Reclassifications     268
Impairment 0   (130,709)
Ending balance (849,487) (1,028,085) (1,283,740)
Purchase deposits for flight equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 463,274 474,060  
Ending balance 407,814 463,274 474,060
Purchase deposits for flight equipment [member] | Gross carrying amount [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 463,274 474,060 413,633
Transfer of pre-delivery payments (49,860) (78,143) (156,305)
Additions 0 67,357 216,732
Disposals 0 0 0
Assets held for sale 0 0 0
Reclassifications (5,600) 0 0
Ending balance 407,814 463,274 474,060
Purchase deposits for flight equipment [member] | Accumulated depreciation and impairment [member]      
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
Assets held for sale 0   0
Reclassifications     0
Impairment 0   0
Ending balance 0 0 0
Ramp and miscellaneous [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 12,466 13,055  
Ending balance 9,911 12,466 13,055
Ramp and miscellaneous [member] | Gross carrying amount [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 56,337 53,736 48,353
Transfer of pre-delivery payments 0 0 0
Additions 582 2,693 5,434
Disposals (306) (102) (128)
Assets held for sale 0 0 0
Reclassifications 0 10 77
Ending balance 56,613 56,337 53,736
Ramp and miscellaneous [member] | Accumulated depreciation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance (43,871) (40,681) (37,016)
Depreciation for the year (3,121) (3,292) (3,783)
Disposals 290 102 118
Assets held for sale 0   0
Reclassifications     0
Impairment 0   0
Ending balance (46,702) (43,871) (40,681)
Furniture, fixture, equipment a and other [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 5,292 5,832  
Ending balance 2,335 5,292 5,832
Furniture, fixture, equipment a and other [member] | Gross carrying amount [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 32,798 30,918 27,524
Transfer of pre-delivery payments 0 0 0
Additions 221 2,450 3,773
Disposals (223) (570) (393)
Assets held for sale 0 0 0
Reclassifications 0 0 14
Ending balance 32,796 32,798 30,918
Furniture, fixture, equipment a and other [member] | Accumulated depreciation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance (27,506) (25,086) (22,959)
Depreciation for the year (3,134) (2,938) (2,506)
Disposals 179 518 379
Assets held for sale 0   0
Reclassifications     0
Impairment 0   0
Ending balance (30,461) (27,506) (25,086)
Leasehold improvements [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 28,973 18,843  
Ending balance 25,677 28,973 18,843
Leasehold improvements [member] | Gross carrying amount [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 65,291 49,404 50,043
Transfer of pre-delivery payments 0 0 0
Additions 566 3,269 3,388
Disposals (780) (134) (6,246)
Assets held for sale 0 0 0
Reclassifications 2,382 12,752 2,219
Ending balance 67,459 65,291 49,404
Leasehold improvements [member] | Accumulated depreciation and impairment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance (36,318) (30,561) (31,919)
Depreciation for the year (5,759) (5,757) (5,038)
Disposals 295 0 6,396
Assets held for sale 0   0
Reclassifications     0
Impairment 0   0
Ending balance (41,782) (36,318) (30,561)
Construction in progress [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 5,587 14,253  
Ending balance 6,161 5,587 14,253
Construction in progress [member] | Gross carrying amount [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 5,587 14,253 5,778
Transfer of pre-delivery payments 0 0 0
Additions 3,204 4,436 10,795
Disposals 0 (340) (10)
Assets held for sale 0 0 0
Reclassifications (2,626) (12,762) (2,310)
Ending balance 6,165 5,587 14,253
Construction in progress [member] | Accumulated depreciation and impairment [member]      
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
Assets held for sale 0   0
Reclassifications     0
Impairment (4)   0
Ending balance $ (4) $ 0 $ 0