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Income Tax - Summary of Reconciliation of Tax Expense (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]    
Earnings before income taxes $ (79,733) $ 38,102
Canadian statutory rate 23.40% 23.80%
Expected income tax provision $ (18,658) $ 9,068
Change in unrecognized deferred tax asset 27,664 44,704
Impairment of goodwill 11,232 0
Exchange rate effects on tax basis (2,223) (2,269)
Earnings taxed in foreign jurisdictions 543 2,313
Revaluation of Canadian deferred tax assets due to change in statutory rate 0 (660)
Withholding tax on dividends received from foreign subsidiaries 0 2,763
Amounts not deductible (taxable) for tax purposes 4,373 811
Impact of accounting for associates and joint ventures (1,104) (160)
Other (617) (13)
Income tax expense from continuing operations $ 21,210 $ 56,557