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Property, plant and equipment - Schedule of Plant, Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Cost $ 8,417,772 $ 7,406,319
Accumulated depreciation 1,186,108 1,012,761
Net book value 7,231,664 6,393,558
Land    
Property, Plant and Equipment [Line Items]    
Cost 74,517 73,773
Accumulated depreciation 0 0
Net book value 74,517 73,773
Equipment and other    
Property, Plant and Equipment [Line Items]    
Cost 94,583 88,757
Accumulated depreciation 47,541 41,295
Net book value 47,042 47,462
Generation    
Property, Plant and Equipment [Line Items]    
Cost 2,816,611 2,470,279
Accumulated depreciation 540,118 450,230
Net book value 2,276,493 2,020,049
Generation | Construction in progress    
Property, Plant and Equipment [Line Items]    
Cost 140,235 104,996
Accumulated depreciation 0 0
Net book value 140,235 104,996
Liberty Utilities Group    
Property, Plant and Equipment [Line Items]    
Cost 4,988,297 4,455,935
Accumulated depreciation 598,449 521,236
Net book value 4,389,848 3,934,699
Liberty Utilities Group | Construction in progress    
Property, Plant and Equipment [Line Items]    
Cost 303,529 212,579
Accumulated depreciation 0 0
Net book value $ 303,529 $ 212,579