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Income Tax - Summary Of Deductible Temporary Differences Of Income Tax Expenses (Detail) - CAD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of Deductible Temporary Differences of Income Tax Expenses [Line Items]    
Deductible temporary differences for which no deferred tax asset is recognised $ 225,903 $ 49,667
Canadian Tax losses [Member]    
Disclosure of Deductible Temporary Differences of Income Tax Expenses [Line Items]    
Deductible temporary differences for which no deferred tax asset is recognised 138,408  
Canadian Capital assets [Member]    
Disclosure of Deductible Temporary Differences of Income Tax Expenses [Line Items]    
Deductible temporary differences for which no deferred tax asset is recognised 22,758  
Canadian Accounting provisions & other accruals [Member]    
Disclosure of Deductible Temporary Differences of Income Tax Expenses [Line Items]    
Deductible temporary differences for which no deferred tax asset is recognised 26,363  
Foreign Tax losses [Member]    
Disclosure of Deductible Temporary Differences of Income Tax Expenses [Line Items]    
Deductible temporary differences for which no deferred tax asset is recognised $ 38,374 $ 49,667