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Loans and borrowings - Additional Information (Detail)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 18, 2023
USD ($)
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
shares
Jul. 14, 2023
shares
Apr. 30, 2020
USD ($)
Disclosure of detailed information about borrowings [line items]            
Debt including current maturities   $ 1,462,691 $ 1,670,807 $ 1,462,691    
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         0.0201603  
Share settlement convertible notes $ 349,000     $ 349,495    
Remeasurement of convertible notes     $ 87,900      
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
Effective interest rates of borrowings           4.50%
Fair value of the embedded derivative at initial recognition           $ 138,400
Senior Convertible Notes Due Through 2025            
Disclosure of detailed information about borrowings [line items]            
Shares settlement convertible notes, not converted by holders $ 1,000          
Export-Import Bank of United States            
Disclosure of detailed information about borrowings [line items]            
Outstanding indebtedness   $ 416,600 $ 376,700 $ 416,600    
Finance lease | Long term fixed rate debt            
Disclosure of detailed information about borrowings [line items]            
Debt including current maturities   623,200 700,700 623,200    
Finance lease | Long term variable rate debt            
Disclosure of detailed information about borrowings [line items]            
Debt including current maturities   $ 422,900 $ 593,400 $ 422,900