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Financial instruments-Risk management and fair value - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]      
Investments at fair value $ 69,500 $ 107,800  
Net change in fair value of derivatives (4,325) 4,469 $ (98,347)
Debt including current maturities $ 1,980,441 $ 1,670,807  
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 $ 9,100    
Increase decrease in fair value of debt $ 36,100    
Currency risk      
Disclosure of detailed information about financial instruments [line items]      
Percentage of foreign exchange risk expenses 84.20% 83.60% 79.20%
Currency risk | U.S. dollars      
Disclosure of detailed information about financial instruments [line items]      
Percentage of foreign exchange risk revenue 67.50% 65.00% 64.30%
Fixed Rated Debt      
Disclosure of detailed information about financial instruments [line items]      
Debt including current maturities $ 1,062,900    
Variable Rated Debt      
Disclosure of detailed information about financial instruments [line items]      
Debt including current maturities $ 917,500    
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 $ 88,900