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Other long-term liabilities - Schedule of Long-Term Liabilities and Deferred Credits (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Long-term Liabilities      
Advances in aid of construction $ 79,864 $ 60,828  
Environmental remediation obligation 69,383 58,061 $ 55,621
Asset retirement obligations 79,968 53,879 $ 43,291
Customer deposits 31,939 31,946  
Unamortized investment tax credits 17,893 18,234  
Deferred credits 21,156 18,952  
Preferred shares, Series C 13,698 13,793  
Hook up fees 17,704 9,610  
Lease liabilities 14,288 9,695  
Contingent development support obligations 12,273 9,446  
Note payable to related party 30,493 0  
Other 23,027 16,896  
Other long-term liabilities 411,686 301,340  
Less: current portion (72,505) (57,939)  
Other long-term liabilities, excluding current 339,181 243,401  
Transfers from advances in aid of construction to contributions in aid of construction 1,994 5,465  
Undiscounted, unescalated cost of environmental cleanup activities 60,803 58,484  
Accrual for environmental loss contingencies to be incurred over next four years 43,995    
Regulatory assets $ 845,471 559,887  
Note payable to related party      
Other Long-term Liabilities      
Interest rate (percent) 0.675%    
Atlantica      
Other Long-term Liabilities      
Contingent consideration related to prior acquisition   29,100  
San Antonio Water System      
Other Long-term Liabilities      
Additional deferred credits related to investment in San Antonio Water System   5,000  
Environmental costs      
Other Long-term Liabilities      
Environmental remediation, rate recovery period 7 years    
Regulatory assets $ 87,308 $ 82,300  
Minimum      
Other Long-term Liabilities      
Other liability repayment period 5 years    
Accrual for environmental cleanup, discount rate (percent) 0.80%    
Maximum      
Other Long-term Liabilities      
Other liability repayment period 40 years    
Accrual for environmental cleanup, discount rate (percent) 3.40%