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Income Tax - Summary of Years Open to Examination under Different Jurisdiction (Detail) | 12 Months Ended
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Dec. 31, 2020
Earliest Tax Year [Member] | Canada [Member] | Canada |
Income Tax Examination [Line Items] |
Years open to examination | 2012
Earliest Tax Year [Member] | Canada [Member] | UK |
Income Tax Examination [Line Items] |
Years open to examination | 2013
Earliest Tax Year [Member] | US [Member] |
Income Tax Examination [Line Items] |
Years open to examination | 2017
Latest Tax Year [Member] | Canada [Member] | Canada |
Income Tax Examination [Line Items] |
Years open to examination | 2020
Latest Tax Year [Member] | Canada [Member] | UK |
Income Tax Examination [Line Items] |
Years open to examination | 2020
Latest Tax Year [Member] | US [Member] |
Income Tax Examination [Line Items] |
Years open to examination | 2020

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tax year that remains open to examination under enacted tax laws, in CCYY format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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