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New Standards and Interpretations Not Yet Adopted - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Air traffic liability $ 470,693 $ 396,237 $ 352,110
Frequent flyer deferred revenue 13,186 9,044 18,884
Retained earnings 1,944,439 1,681,573 1,441,831
Passenger revenue 2,462,419 2,155,167 2,185,465
Other operating revenue 9,847 12,696 11,507
Income tax expense (49,310) (38,271) $ (32,759)
Aircraft [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Future minimum lease payments 400,835    
Transition impact [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Air traffic liability 6,475 3,559  
Frequent flyer deferred revenue 4,011 1,314  
Retained earnings (4,524) (2,354)  
Passenger revenue (18,442) (6,666)  
Other operating revenue 12,672 4,000  
Income tax expense 471 349  
Transition impact [member] | Retained earnings [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Change in the timing of revenue recognition   (2,200)  
Change in the amount deferred for mileages credits   (200)  
Transition impact [member] | Other operating revenues [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Reclassification between Passenger revenue and Other operating revenue 15,400 5,100  
Change in the amount deferred for mileages credits (2,700) (1,100)  
Transition impact [member] | Passenger revenue [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Change in the timing of revenue recognition (2,800) (1,400)  
Reclassification between Passenger revenue and Other operating revenue (15,400) (5,100)  
Reclassification of denied board compensation from the Sales and distribution operating expenses to Passenger revenue $ (200) $ (200)