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Income Taxes - Components of Income Tax Expense (Details) - CAD
CAD in Thousands
 12 Months Ended
Feb. 03, 2016
Feb. 02, 2016
Jun. 18, 2015
Jun. 17, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disposal Groups, Including Discontinued Operations [Line Items]              
Current income tax expense(1)         CAD 79,000 CAD 23,000 CAD 24,000
Adjustments in respect of current income tax of previous years         0 0 (5,000)
Adjustments in respect of deferred income tax of previous years         0 (3,000) 5,000
Deferred income tax expense related to the origination and reversal of temporary differences         (110,000) 16,000 22,000
Deferred income tax expense related to temporary difference on investment in subsidiary         0 11,000 95,000
Deferred income tax expense resulting from changes in tax rates or laws         110,000 1,000 20,000
Reversal of writedown of deferred income tax assets         (15,000) (10,000) (56,000)
Income tax expense         64,000 38,000 105,000
Current income tax expense         79,000 23,000 19,000
Deferred income tax expense (recovery)         (15,000) 15,000 CAD 86,000
Deferred income tax liabilities (Note 10)         549,000 CAD 712,000  
Net deferred tax assets         6,000    
Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Deferred Tax Asset, Income Tax Expense (Benefit)         104,000    
Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Deferred Tax Liability, Income Tax (Expense) Benefit         110,000    
Deferred tax expense (income) recognised in profit or loss         1,000    
Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Deferred Tax Recovery         CAD 111,000    
Corporate tax rate         26.80% 26.70% 25.90%
New Brunswick              
Disposal Groups, Including Discontinued Operations [Line Items]              
Corporate tax rate 1400.00% 1200.00%          
Alberta              
Disposal Groups, Including Discontinued Operations [Line Items]              
Corporate tax rate     1200.00% 1000.00%      
Solomon Power Station              
Disposal Groups, Including Discontinued Operations [Line Items]              
Current income tax expense(1)         CAD 56,000    
Canadian Assets              
Disposal Groups, Including Discontinued Operations [Line Items]              
Deferred income tax liabilities (Note 10)           CAD 8,000  
Australian Assets              
Disposal Groups, Including Discontinued Operations [Line Items]              
Deferred income tax liabilities (Note 10)             CAD 95,000
New Richmond              
Disposal Groups, Including Discontinued Operations [Line Items]              
Deferred income tax liabilities (Note 10)         CAD 3,000