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Subsequent events (Detail)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2016
Mar. 31, 2025
USD ($)
aircraft
award
shares
Dec. 31, 2024
USD ($)
aircraft
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Feb. 12, 2025
$ / shares
Disclosure of non-adjusting events after reporting period [line items]            
Dividend payable annual percentage 40.00%          
Share-based compensation expense | $     $ 5.5 $ 4.4 $ 5.2  
Number of new aircrafts purchased | aircraft     4      
B-737-Max            
Disclosure of non-adjusting events after reporting period [line items]            
Number of new aircrafts purchased | aircraft   6        
Number of Aircrafts Owned | aircraft   57        
2024 Dividend Plan            
Disclosure of non-adjusting events after reporting period [line items]            
Dividends payable (in dollars per share) | $ / shares           1.61
Announcement of new equity awards            
Disclosure of non-adjusting events after reporting period [line items]            
Number of share-based compensation awards approved | award   3        
Number of shares authorized for grant (in shares) | shares   39,653        
Share-based arrangement, vesting period   3 years        
Fair value of non-vested stock awards | $   $ 3.9        
Share-based compensation expense | $   $ 1.9