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Financial instruments - Liabilities Mature (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Derivative [Line Items]    
Long-term debt obligations $ 8,537,557  
Interest on long-term debt 4,910,236  
Purchase obligations 767,287  
Environmental obligation 46,187  
Advances in aid of construction 88,135 $ 88,546
Contract adjustment payments 39,590 $ 113,876
Other obligations 280,481  
Total obligations 14,773,918  
Cross-currency swap    
Derivative [Line Items]    
Total derivative instruments 16,429  
Interest rate forwards    
Derivative [Line Items]    
Total derivative instruments 11,790  
Energy derivative and commodity contracts    
Derivative [Line Items]    
Total derivative instruments 76,226  
Due less than 1 year    
Derivative [Line Items]    
Long-term debt obligations 621,856  
Interest on long-term debt 391,493  
Purchase obligations 767,287  
Environmental obligation 3,136  
Advances in aid of construction 3,640  
Contract adjustment payments 39,590  
Other obligations 27,796  
Total obligations 1,883,283  
Due less than 1 year | Cross-currency swap    
Derivative [Line Items]    
Total derivative instruments 2,419  
Due less than 1 year | Interest rate forwards    
Derivative [Line Items]    
Total derivative instruments 11,790  
Due less than 1 year | Energy derivative and commodity contracts    
Derivative [Line Items]    
Total derivative instruments 14,276  
Due 2 to 3 years    
Derivative [Line Items]    
Long-term debt obligations 1,333,772  
Interest on long-term debt 602,761  
Purchase obligations 0  
Environmental obligation 22,577  
Advances in aid of construction 0  
Contract adjustment payments 0  
Other obligations 2,901  
Total obligations 1,995,527  
Due 2 to 3 years | Cross-currency swap    
Derivative [Line Items]    
Total derivative instruments 4,243  
Due 2 to 3 years | Interest rate forwards    
Derivative [Line Items]    
Total derivative instruments 0  
Due 2 to 3 years | Energy derivative and commodity contracts    
Derivative [Line Items]    
Total derivative instruments 29,273  
Due 4 to 5 years    
Derivative [Line Items]    
Long-term debt obligations 2,099,968  
Interest on long-term debt 419,950  
Purchase obligations 0  
Environmental obligation 1,820  
Advances in aid of construction 0  
Contract adjustment payments 0  
Other obligations 2,304  
Total obligations 2,544,736  
Due 4 to 5 years | Cross-currency swap    
Derivative [Line Items]    
Total derivative instruments 144  
Due 4 to 5 years | Interest rate forwards    
Derivative [Line Items]    
Total derivative instruments 0  
Due 4 to 5 years | Energy derivative and commodity contracts    
Derivative [Line Items]    
Total derivative instruments 20,550  
Due after 5 years    
Derivative [Line Items]    
Long-term debt obligations 4,481,961  
Interest on long-term debt 3,496,032  
Purchase obligations 0  
Environmental obligation 18,654  
Advances in aid of construction 84,495  
Contract adjustment payments 0  
Other obligations 247,480  
Total obligations 8,350,372  
Due after 5 years | Cross-currency swap    
Derivative [Line Items]    
Total derivative instruments 9,623  
Due after 5 years | Interest rate forwards    
Derivative [Line Items]    
Total derivative instruments 0  
Due after 5 years | Energy derivative and commodity contracts    
Derivative [Line Items]    
Total derivative instruments $ 12,127