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Income taxes - Non Capital Losses Carry Forwards (Detail) $ in Thousands	Dec. 31, 2023 USD ($)
Capital Loss Carryforwards [Line Items]
Total non-capital loss carryforward	$ 2,823,170
Tax credits	204,131
Canada
Capital Loss Carryforwards [Line Items]
Total non-capital loss carryforward	917,120
U.S.
Capital Loss Carryforwards [Line Items]
Total non-capital loss carryforward	1,906,050
2024—2028
Capital Loss Carryforwards [Line Items]
Total non-capital loss carryforward	11,780
Tax credits	3,359
2024—2028 | Canada
Capital Loss Carryforwards [Line Items]
Total non-capital loss carryforward	3,339
2024—2028 | U.S.
Capital Loss Carryforwards [Line Items]
Total non-capital loss carryforward	8,441
2029+
Capital Loss Carryforwards [Line Items]
Total non-capital loss carryforward	2,811,390
Tax credits	200,772
2029+ | Canada
Capital Loss Carryforwards [Line Items]
Total non-capital loss carryforward	913,781
2029+ | U.S.
Capital Loss Carryforwards [Line Items]
Total non-capital loss carryforward	$ 1,897,609

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-3

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-3

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