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Financial instruments - Liabilities Mature (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Derivative [Line Items]    
Long-term debt obligations $ 3,931,905  
Convertible debentures 346  
Advances in aid of construction 60,828  
Interest on long-term debt 1,753,259  
Purchase obligations 458,288  
Environmental obligation 58,484 $ 59,181
Other obligations 153,025  
Total obligations 6,500,799  
Cross currency swap | Net Investment Hedging    
Derivative [Line Items]    
Derivative financial instruments, liabilities 81,765  
Commodity contracts for regulatory operations    
Derivative [Line Items]    
Derivative financial instruments, liabilities 2,899  
Due less than 1 year    
Derivative [Line Items]    
Long-term debt obligations 602,028  
Convertible debentures 0  
Advances in aid of construction 1,165  
Interest on long-term debt 185,231  
Purchase obligations 458,288  
Environmental obligation 14,970  
Other obligations 39,115  
Total obligations 1,306,577  
Due less than 1 year | Cross currency swap | Net Investment Hedging    
Derivative [Line Items]    
Derivative financial instruments, liabilities 4,149  
Due less than 1 year | Commodity contracts for regulatory operations    
Derivative [Line Items]    
Derivative financial instruments, liabilities 1,631  
Due 2 to 3 years    
Derivative [Line Items]    
Long-term debt obligations 468,740  
Interest on long-term debt 318,469  
Environmental obligation 20,850  
Other obligations 2,120  
Total obligations 880,187  
Due 2 to 3 years | Cross currency swap | Net Investment Hedging    
Derivative [Line Items]    
Derivative financial instruments, liabilities 69,099  
Due 2 to 3 years | Commodity contracts for regulatory operations    
Derivative [Line Items]    
Derivative financial instruments, liabilities 909  
Due 4 to 5 years    
Derivative [Line Items]    
Long-term debt obligations 600,721  
Interest on long-term debt 257,443  
Environmental obligation 1,128  
Other obligations 2,696  
Total obligations 865,839  
Due 4 to 5 years | Cross currency swap | Net Investment Hedging    
Derivative [Line Items]    
Derivative financial instruments, liabilities 3,851  
Due 4 to 5 years | Commodity contracts for regulatory operations    
Derivative [Line Items]    
Derivative financial instruments, liabilities 0  
Due after 5 years    
Derivative [Line Items]    
Long-term debt obligations 2,260,416  
Convertible debentures 346  
Advances in aid of construction 59,663  
Interest on long-term debt 992,116  
Environmental obligation 21,536  
Other obligations 109,094  
Total obligations 3,448,196  
Due after 5 years | Cross currency swap | Net Investment Hedging    
Derivative [Line Items]    
Derivative financial instruments, liabilities 4,666  
Due after 5 years | Commodity contracts for regulatory operations    
Derivative [Line Items]    
Derivative financial instruments, liabilities $ 359