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Loans and borrowings - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Sep. 18, 2023
Jul. 14, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
Apr. 30, 2020
USD ($)
Disclosure of detailed information about borrowings [line items]            
Number of trading days immediately before maturity date           40 days
Conversion price percentage           1.30
Percentage redemption price on convertible notes     1      
Conversion ratio per $1,000 principal amount of Notes (in shares) | shares 0.0193564 0.0193564   0.0201603    
Share settlement convertible notes $ 349,000 $ 349,495        
Remeasurement of convertible notes   87,900        
Debt including current maturities $ 1,462,691 $ 1,462,691     $ 1,444,303  
Class A common stock            
Disclosure of detailed information about borrowings [line items]            
Share settlement convertible notes (in shares) | shares 3,700,000 3,694,845        
Bottom of range            
Disclosure of detailed information about borrowings [line items]            
Support from Export-Import Bank for net purchase price of aircraft   80.00%        
Top of range            
Disclosure of detailed information about borrowings [line items]            
Support from Export-Import Bank for net purchase price of aircraft   85.00%        
Senior Convertible Notes            
Disclosure of detailed information about borrowings [line items]            
Principal amount $ 350,000 $ 350,000       $ 350,000
Effective interest rates of borrowings           4.50%
Conversion price per principal amount | $ / shares   $ 51.66        
Fair value of the embedded derivative at initial recognition           $ 138,400
Export-Import Bank of United States            
Disclosure of detailed information about borrowings [line items]            
Outstanding indebtedness 416,600 $ 416,600     $ 466,600  
2025            
Disclosure of detailed information about borrowings [line items]            
Effective interest rates of borrowings         14.68%  
Shares settlement convertible notes, not converted by holders       $ 1,000    
Debt including current maturities         $ 270,033  
Finance lease | Long term fixed rate debt            
Disclosure of detailed information about borrowings [line items]            
Debt including current maturities 623,200 623,200     516,500  
Finance lease | Long term variable rate debt            
Disclosure of detailed information about borrowings [line items]            
Debt including current maturities $ 422,900 $ 422,900     $ 157,800