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Loans and borrowings - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Apr. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]        
Debt including current maturities   $ 1,163,900 $ 1,060,765  
Support from Export-Import Bank for net purchase price of aircraft   80.00%    
Net change in fair value of derivatives   $ (107,139) 0 $ 0
Export-Import Bank of United States [member]        
Disclosure of detailed information about borrowings [line items]        
Outstanding indebtedness   160,700 227,300  
Borrowing on which fixed applicable interest rate is exercised   $ 83,600 128,100  
Senior Convertible Notes [Member]        
Disclosure of detailed information about borrowings [line items]        
Debt Instrument Maturity Date Apr. 15, 2025 Apr. 30, 2020    
Description of conversion ratio of senior convertible notes   The initial conversion rate is 19.3564 shares per $1,000 principal amount of notes    
Conversion price per principal amount   $ 51.66    
Net change in fair value of derivatives   $ (107,100)    
Borrowing interest rate 4.50%      
Nominal Issue $ 350,000 350,000    
Fair Value   245,600    
Fair value of the embedded derivative at initial recognition $ 138,400      
Finance lease [member] | Fixed interest rate [member]        
Disclosure of detailed information about borrowings [line items]        
Debt including current maturities   579,700 608,300  
Finance lease [member] | Floating interest rate [member]        
Disclosure of detailed information about borrowings [line items]        
Debt including current maturities   $ 202,600 $ 225,200