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Other long-term liabilities - Schedule of Long-Term Liabilities and Deferred Credits (Detail)
$ in Thousands
 1 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2021
$ / shares
Dec. 31, 2019
USD ($)
Other Long-term Liabilities          
Contract adjustment payments on Green Equity Units   $ 187,580 $ 0    
Asset retirement obligations   142,147 79,968   $ 53,879
Advances in aid of construction   82,580 79,864    
Environmental remediation obligation   55,224 69,383   $ 58,061
Customer deposits   32,633 31,939    
Unamortized investment tax credits   17,439 17,893    
Deferred credits and contingent consideration   35,982 21,399    
Preferred shares, Series C   13,348 13,698    
Hook-up fees   21,904 17,704    
Lease liabilities (note 1(q))   22,512 14,288    
Contingent development support obligations   4,612 12,273    
Notes payable to related party   25,808 30,493    
Other   42,050 23,027    
Other long-term liabilities   683,819 411,929    
Less: current portion   (167,908) (72,748)    
Other long-term liabilities, excluding current   515,911 339,181    
Green Equity Units issued (in shares) | shares 23,000,000        
Green Equity Units, annual distributions (percent) 7.75%        
Green Equity Units, share purchase contract, interest rate (percent) 6.57%        
Contract adjustment payments, accretion period 3 years        
Transfers from advances in aid of construction to contributions in aid of construction   6,376 1,994    
Undiscounted, unescalated cost of environmental cleanup activities   57,167 64,766    
Accrual for environmental loss contingencies to be incurred over next four years   36,627      
Regulatory assets   $ 1,167,625 846,519    
U.S. Dollar Senior Unsecured Notes (Green Equity Units) | Senior Unsecured Notes          
Other Long-term Liabilities          
Proceeds from Green Equity Units $ 1,150,000        
Weighted average coupon 1.18% 1.18%      
Equity Method Investee          
Other Long-term Liabilities          
Notes payable to related party   $ 25,808 $ 30,493    
Series C Preferred Stock          
Other Long-term Liabilities          
Redeemable preferred stock issued (in shares) | shares   100      
Preferred stock redemption price per share (in CAD per share) | $ / shares       $ 53,400,000  
Note payable to related party          
Other Long-term Liabilities          
Interest rate (percent)   4.00% 0.675%    
Other          
Other Long-term Liabilities          
Contingent consideration related to prior acquisition   $ 5,000      
Environmental costs          
Other Long-term Liabilities          
Environmental remediation, rate recovery period   7 years      
Regulatory assets   $ 81,802 $ 87,308    
Minimum          
Other Long-term Liabilities          
Other liability repayment period   5 years      
Accrual for environmental cleanup, discount rate (percent)   1.00%      
Maximum          
Other Long-term Liabilities          
Other liability repayment period   40 years      
Accrual for environmental cleanup, discount rate (percent)   3.40%