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Financial instruments-Risk management and fair value - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]    
Mark to market derivative income (expense) $ 0 $ 0
Investments at fair value 102,100 95,500
Debt including current maturities $ 1,462,691 $ 1,444,303
Interest rate and cash flow risk    
Disclosure of detailed information about financial instruments [line items]    
Average interest rate on derivatives 100.00%  
Change in interest expense $ 4,200  
Increase decrease in fair value of debt $ 16,100  
U.S. dollars    
Disclosure of detailed information about financial instruments [line items]    
Percentage of foreign exchange risk expenses 79.20%  
2034 | Bottom of range    
Disclosure of detailed information about financial instruments [line items]    
Effective interest rates of borrowings 1.73% 1.73%
2034 | Long term fixed rate debt    
Disclosure of detailed information about financial instruments [line items]    
Debt including current maturities $ 1,039,821 $ 983,138
2033 | Bottom of range    
Disclosure of detailed information about financial instruments [line items]    
Effective interest rates of borrowings 6.53%  
Fixed Rated Debt    
Disclosure of detailed information about financial instruments [line items]    
Debt including current maturities $ 1,039,800  
Variable Rated Debt    
Disclosure of detailed information about financial instruments [line items]    
Debt including current maturities $ 422,900  
Fuel derivative instruments    
Disclosure of detailed information about financial instruments [line items]    
Derivative instrument hypothetical increases percentage 10.00%  
Fuel derivative instruments | 2023 projection    
Disclosure of detailed information about financial instruments [line items]    
Derivative instrument expense increase $ 89,100