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Income taxes - Non Capital Losses Carry Forwards (Detail) $ in Thousands | Dec. 31, 2020 USD ($)
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Capital Loss Carryforwards [Line Items] |
Non-capital loss carryforwards | $ 1,478,580
Tax credits | 76,473
Canada |
Capital Loss Carryforwards [Line Items] |
Non-capital loss carryforwards | 552,564
U.S. |
Capital Loss Carryforwards [Line Items] |
Non-capital loss carryforwards | 926,016
Tax Years 2021-2026 |
Capital Loss Carryforwards [Line Items] |
Non-capital loss carryforwards | 13,485
Tax credits | 3,624
Tax Years 2021-2026 | Canada |
Capital Loss Carryforwards [Line Items] |
Non-capital loss carryforwards | 58
Tax Years 2021-2026 | U.S. |
Capital Loss Carryforwards [Line Items] |
Non-capital loss carryforwards | 13,427
Tax Years 2027 and after |
Capital Loss Carryforwards [Line Items] |
Non-capital loss carryforwards | 1,465,095
Tax credits | 72,849
Tax Years 2027 and after | Canada |
Capital Loss Carryforwards [Line Items] |
Non-capital loss carryforwards | 552,506
Tax Years 2027 and after | U.S. |
Capital Loss Carryforwards [Line Items] |
Non-capital loss carryforwards | $ 912,589

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- Definition 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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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- Definition 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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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