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Income Tax - Summary of Reconciliation of Tax Expense (Detail) - CAD ($) $ in Thousands | 12 Months Ended
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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

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