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Income taxes - Provision for Income Taxes (Detail) - CAD
CAD in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]    
Expected income tax expense at Canadian statutory rate CAD 34,516 CAD 19,199
Increase (decrease) resulting from:    
Recognition of deferred credit (2,448) (5,763)
Effect of differences in tax rates on transactions in and within foreign jurisdictions and change in tax rates (3,855) (1,677)
Non-taxable corporate dividend (3,311) (2,618)
Non-controlling interests share of income 12,511 8,824
Production tax credit (254) (339)
Allowance for equity funds used during construction (935) (746)
State taxes 733 604
Adjustment relating to prior periods 2,431 0
CRA Settlement 2,709 0
Other 1,616 (677)
Income tax expense CAD 43,713 CAD 16,807