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Revenue From Contract With Customers - Summary of Disaggregated Operating Revenues (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating revenue $ 19,407 $ 32,343 $ 27,755
Total operating revenue 801,003 2,707,408 2,677,627
Passenger revenue excluding miles redeemed [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 752,050 2,581,179 2,567,316
Miles redeemed [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 8,544 31,426 20,073
Passenger revenue [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 760,594 2,612,605 2,587,389
Cargo and mail revenue [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 21,002 62,460 62,483
Frequent flyer program - marketing services revenue [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating revenue 15,452 22,170 16,291
Other operating revenues [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating revenue $ 3,955 $ 10,173 $ 11,464