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Property, plant and equipment - Schedule of Plant, Property and Equipment (Detail) - CAD
CAD in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Cost CAD 8,938,776 CAD 5,816,327
Accumulated depreciation 1,029,283 926,381
Net book value 7,909,493 4,889,946
Land    
Property, Plant and Equipment [Line Items]    
Cost 89,935 60,868
Accumulated depreciation 0 0
Net book value 89,935 60,868
Equipment and other    
Property, Plant and Equipment [Line Items]    
Cost 143,158 139,961
Accumulated depreciation 51,026 44,700
Net book value 92,132 95,261
Generation    
Property, Plant and Equipment [Line Items]    
Cost 2,988,569 2,613,267
Accumulated depreciation 494,912 419,227
Net book value 2,493,657 2,194,040
Generation | Construction in progress    
Property, Plant and Equipment [Line Items]    
Cost 263,418 197,405
Accumulated depreciation 0 0
Net book value 263,418 197,405
Liberty Utilities Group    
Property, Plant and Equipment [Line Items]    
Cost 5,247,499 2,638,488
Accumulated depreciation 483,345 462,454
Net book value 4,764,154 2,176,034
Liberty Utilities Group | Construction in progress    
Property, Plant and Equipment [Line Items]    
Cost 206,197 166,338
Accumulated depreciation 0 0
Net book value CAD 206,197 CAD 166,338