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Income Taxes - Summary of Balances of Deferred Taxes (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred tax liabilities      
Maintenance deposits $ (23,891) $ (29,863)  
Prepaid dividend tax 0 (7,403)  
Property and equipment 2,108 (2,896)  
Other (1,500) (4,690)  
Set off tax 1,093 1,455  
Deferred tax liabilities (22,190) (43,397)  
Deferred tax assets      
Provision for return conditions 12,665 10,095  
Air traffic liability 2,486 2,039  
Other provisions 624 6,826  
Tax Loss 20,913 1,710  
Set off tax (1,093) (1,455)  
Deferred tax assets 35,595 19,215  
Total deferred taxes 13,405 (24,182)  
Deferred tax liabilities      
Maintenance deposits (5,972) 0 $ 3,277
Prepaid dividend tax (7,403) (1,456) (5,244)
Property and equipment (5,004) (4,500) (2,136)
Other (3,190) (1) 641
Set off tax 362 414 (63)
Deferred tax liabilities (21,207) (5,543) (3,525)
Deferred tax assets      
Provision for return conditions (2,570) (2,959) 723
Air traffic liability (447) (247) (511)
Other provisions 6,202 (2,139) (271)
Tax Loss (19,203) 2,585 3,054
Set off tax (362) (414) 63
Deferred tax assets (16,380) (3,174) 3,058
Origination and reversal of temporary differences $ (37,587) $ (8,717) $ (467)