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Income taxes - Disclosure of reconciliation of statutory weighted average tax rate applicable to income (Details) - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Major components of tax expense (income) [abstract]    
Loss before income taxes $ (274,595) $ (140,735)
Income tax provision calculated using the combined Canadian federal and provincial statutory income tax rate (73,042) (37,576)
Increase (decrease) in income taxes resulting from:    
Non-deductible expenses, net 738 719
Non-deductible portion of capital losses, net 4,877 856
Non-deductible (non-taxable) foreign exchange loss (gain) (357) 787
Tax rate changes of deferred income taxes 98 253
Differences in foreign statutory tax rates 19,758 (1,043)
Foreign withholding taxes 584 583
Share of equity loss of associates 2,954 0
Tax benefits not recognized 3,891 25
Other, net 99 248
Total income tax recovery $ (40,400) $ (35,148)