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Financial instruments - Liabilities Mature (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Derivative [Line Items]    
Long-term debt obligations $ 6,223,334  
Interest on long-term debt 1,847,212  
Purchase obligations 614,024  
Environmental obligation 57,167  
Advances in aid of construction 82,580 $ 79,864
Contract adjustment payments on Green Equity Units 187,580 $ 0
Other obligations 335,927  
Total obligations 9,473,362  
Cross-currency swap    
Derivative [Line Items]    
Total derivative instruments 55,543  
Interest rate swaps    
Derivative [Line Items]    
Total derivative instruments 7,015  
Energy derivative and commodity contracts    
Derivative [Line Items]    
Total derivative instruments 62,980  
Due less than 1 year    
Derivative [Line Items]    
Long-term debt obligations 834,645  
Interest on long-term debt 196,824  
Purchase obligations 614,024  
Environmental obligation 12,751  
Advances in aid of construction 1,706  
Contract adjustment payments on Green Equity Units 75,555  
Other obligations 66,916  
Total obligations 1,840,991  
Due less than 1 year | Cross-currency swap    
Derivative [Line Items]    
Total derivative instruments 27,936  
Due less than 1 year | Interest rate swaps    
Derivative [Line Items]    
Total derivative instruments 2,145  
Due less than 1 year | Energy derivative and commodity contracts    
Derivative [Line Items]    
Total derivative instruments 8,489  
Due 2 to 3 years    
Derivative [Line Items]    
Long-term debt obligations 500,070  
Interest on long-term debt 348,479  
Purchase obligations 0  
Environmental obligation 23,876  
Advances in aid of construction 0  
Contract adjustment payments on Green Equity Units 112,025  
Other obligations 4,473  
Total obligations 1,034,327  
Due 2 to 3 years | Cross-currency swap    
Derivative [Line Items]    
Total derivative instruments 23,115  
Due 2 to 3 years | Interest rate swaps    
Derivative [Line Items]    
Total derivative instruments 2,141  
Due 2 to 3 years | Energy derivative and commodity contracts    
Derivative [Line Items]    
Total derivative instruments 20,148  
Due 4 to 5 years    
Derivative [Line Items]    
Long-term debt obligations 1,217,235  
Interest on long-term debt 297,461  
Purchase obligations 0  
Environmental obligation 1,066  
Advances in aid of construction 0  
Contract adjustment payments on Green Equity Units 0  
Other obligations 4,427  
Total obligations 1,540,645  
Due 4 to 5 years | Cross-currency swap    
Derivative [Line Items]    
Total derivative instruments 2,604  
Due 4 to 5 years | Interest rate swaps    
Derivative [Line Items]    
Total derivative instruments 1,335  
Due 4 to 5 years | Energy derivative and commodity contracts    
Derivative [Line Items]    
Total derivative instruments 16,517  
Due after 5 years    
Derivative [Line Items]    
Long-term debt obligations 3,671,384  
Interest on long-term debt 1,004,448  
Purchase obligations 0  
Environmental obligation 19,474  
Advances in aid of construction 80,874  
Contract adjustment payments on Green Equity Units 0  
Other obligations 260,111  
Total obligations 5,057,399  
Due after 5 years | Cross-currency swap    
Derivative [Line Items]    
Total derivative instruments 1,888  
Due after 5 years | Interest rate swaps    
Derivative [Line Items]    
Total derivative instruments 1,394  
Due after 5 years | Energy derivative and commodity contracts    
Derivative [Line Items]    
Total derivative instruments $ 17,826