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Income taxes - Non Capital Losses Carry Forwards (Detail) $ in Thousands | Dec. 31, 2018 USD ($)
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2020 and onwards |
Capital Loss Carryforwards [Line Items] |
Non-capital loss carryforwards | $ 925,439

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Period Type: | duration

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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://www.xbrl.org/2003/role/presentationRef -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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Balance Type: | debit
Period Type: | instant

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- Details
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