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Business acquisitions, development projects and disposition transactions - Schedule of Preliminary Allocation Of The Acquisition Prices Of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Jun. 15, 2023
Dec. 31, 2022
Jan. 01, 2022
Dec. 31, 2021
Business Acquisition [Line Items]          
Goodwill (note 6) $ 1,324,062   $ 1,320,579   $ 1,201,244
Deerfield II          
Business Acquisition [Line Items]          
Working capital   $ (10,709)      
Property, plant and equipment   194,419      
Long-term debt   (157,935)      
Asset retirement obligation   (1,030)      
Deferred tax liability   (1,603)      
Total net assets acquired   23,142      
Cash and cash equivalents   1,662      
Net assets acquired, net of cash and cash equivalents   $ 21,480      
New York Water Company, Inc          
Business Acquisition [Line Items]          
Working capital       $ 4,820  
Property, plant and equipment       499,252  
Goodwill (note 6)       116,254  
Regulatory assets       65,621  
Other assets       4,507  
Pension and other post-employment benefits       (13,402)  
Regulatory liabilities       (59,727)  
Other liabilities       (8,028)  
Total net assets acquired       609,297  
Cash and cash equivalents       49  
Net assets acquired, net of cash and cash equivalents       $ 609,248