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Revenue From Contract With Customers - Summary of Changes in Contract Liabilities (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Air traffic liability [member]    
Disclosure of changes in contact liabilities [line items]    
Balance at beginning of year $ 497,374 $ 471,676
Sales 887,004 2,878,814
Revenue recognition (700,406) (2,355,626)
Tax recognition (113,473) (404,732)
Reimbursements (82,910) (45,396)
Interline tickets (15,056) (35,272)
Other (1,838) (12,090)
Balance at end of year 470,695 497,374
Frequent flyer liability [member]    
Disclosure of changes in contact liabilities [line items]    
Balance at beginning of year 80,326 67,814
Deferred of revenue 19,431 43,938
Revenue recognition (8,544) (31,426)
Balance at end of year 91,213 80,326
Current 16,041 35,120
Non-current $ 75,172 $ 45,206