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Income taxes - Provision for Income Taxes (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Income Tax Disclosure [Abstract] |  |  |  |
Expected income tax recovery at Canadian statutory rate | $ (84,596) | $ (22,562) | $ (11,903) | $ (6,119)
Increase (decrease) resulting from: |  |  |  |
Effect of differences in tax rates on transactions in and within foreign jurisdictions and change in tax rates | (5,560) | (6,562) | (16,718) | (19,039)
Adjustments from investments carried at fair value | 40,357 | 17,216 | 11,092 | 18,229
Change in valuation allowance | 676 | (1,582) | (791) | (1,731)
Non-controlling interests share of income | 2,201 | 4,587 | 12,393 | 15,640
Acquisition-related state deferred tax adjustments | 0 | 0 | 0 | 7,600
Tax credits | (8,095) | (11,992) | (20,505) | (22,023)
Amortization and settlement of excess deferred income tax | (2,456) | (2,296) | (6,207) | (6,329)
Other | 1,515 | 372 | 1,382 | 405
Income tax recovery | $ (55,958) | $ (22,819) | $ (31,257) | $ (13,367)

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