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Income Taxes - Summary of Balances of Deferred Taxes (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred tax liabilities      
Maintenance deposits $ (26,586) $ (23,790)  
Prepaid dividend tax (14,103) (12,432)  
Property and equipment (9,975) (7,867)  
Other (4,050) (6,013)  
Set off tax 2,249 5,128  
Deferred tax liabilities (52,465) (44,974) $ (32,865)
Deferred tax assets      
Provision for return conditions 7,859 7,606  
Air traffic liability 1,281 1,015  
Fuel derivative   107  
Other provisions 4,859 4,587  
Tax Loss 7,349 10,152  
Set off tax (2,249) (5,128)  
Deferred tax assets 19,099 18,339 12,708
Total deferred taxes (33,366) (26,635)  
Deferred tax liabilities      
Maintenance deposits 2,796 2,286 5,866
Prepaid dividend tax 1,671 5,300  
Property and equipment 2,108 (1,599) 3,579
Other (1,963) (10,147) 11,692
Set off tax 2,879 16,269 (24,568)
Deferred tax liabilities 7,491 12,109 (3,431)
Deferred tax assets      
Provision for return conditions (253) 4,417 (11,203)
Air traffic liability (266) 305 1,076
Fuel derivative 107 4,403 94
Other provisions (272) (3,059) 4,716
Tax Loss 2,803 4,572 (14,724)
Set off tax (2,879) (16,269) 24,568
Deferred tax assets (760) (5,631) 4,527
Origination and reversal of temporary differences $ 6,731 $ 6,478 $ 1,096