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Summary of Accumulated Other Comprehensive Income (Detail) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Accumulated Other Comprehensive Income Loss [Line Items] |  |
Beginning Balance | $ 134,255 |
Other comprehensive income (loss) | 3,326 | $ (27,759)
Ending Balance | 137,581 | 134,255
Unrealized Foreign Currency Translation Gains (Losses) [member] |  |
Disclosure Of Accumulated Other Comprehensive Income Loss [Line Items] |  |
Beginning Balance | 509,582 | 616,363
Other comprehensive income (loss) | (25,925) | (106,781)
Ending Balance | 483,657 | 509,582
Foreign Exchange Gain (Loss) on Net Investment Hedge [member] |  |
Disclosure Of Accumulated Other Comprehensive Income Loss [Line Items] |  |
Beginning Balance | (375,327) | (454,349)
Other comprehensive income (loss) | 23,853 | 79,022
Ending Balance | (351,474) | (375,327)
Tax Benefit Related to Net Investment Hedge of Long Term Debt [member] |  |
Disclosure Of Accumulated Other Comprehensive Income Loss [Line Items] |  |
Other comprehensive income (loss) | 5,398 |
Ending Balance | 5,398 |
Accumulated Other Comprehensive Income [Member] |  |
Disclosure Of Accumulated Other Comprehensive Income Loss [Line Items] |  |
Beginning Balance | 134,255 | 162,014
Other comprehensive income (loss) | 3,326 | (27,759)
Ending Balance | $ 137,581 | $ 134,255

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- Definition The amount of accumulated items of income and expense (including reclassification adjustments) that are not recognised in profit or loss as required or permitted by other IFRSs. [Refer: IFRSs [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of income and expense (including reclassification adjustments) that is not recognised in profit or loss as required or permitted by IFRSs. [Refer: IFRSs [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 106 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_106_d_ii&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B12 -Subparagraph b -Clause viii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B12_b_viii&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 81A -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_81A_b&doctype=Standard -URIDate 2020-01-01 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_91_a&doctype=Standard -URIDate 2020-01-01 + Details
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