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Summary of Movement in Temporary Differences of Deferred Tax Liabilities (Detail) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning Balance | $ 20,665 | $ 35,899
Recognized in net earnings (loss) | 5,664 | (16,037)
Recognized in other comprehensive income | (5,398) |
Effect of foreign currency exchange differences | (793) | 803
Ending Balance | 20,138 | 20,665
Property, Plant and Equipment and Intangibles [member] |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning Balance | 426,934 | 467,109
Recognized in net earnings (loss) | (28,600) | (26,825)
Effect of foreign currency exchange differences | (4,703) | (13,350)
Ending Balance | 393,631 | 426,934
Partnership Deferrals [member] |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning Balance | 850 | 1,730
Recognized in net earnings (loss) | 1,682 | (880)
Ending Balance | 2,532 | 850
Other Deferred Tax Liabilities [Member] |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning Balance | 7,926 | 5,722
Recognized in net earnings (loss) | (1,601) | 2,216
Effect of foreign currency exchange differences | (3) | (12)
Ending Balance | 6,322 | 7,926
Losses [member] |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning Balance | (402,025) | (423,595)
Recognized in net earnings (loss) | 33,141 | 7,874
Recognized in other comprehensive income | (5,398) |
Effect of foreign currency exchange differences | 3,843 | 13,696
Ending Balance | (370,439) | (402,025)
Debt Issue Costs [Member] |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning Balance | 3,280 | 3,534
Recognized in net earnings (loss) | (615) | (254)
Ending Balance | 2,665 | 3,280
Long-Term Incentive Plan [member] |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning Balance | (6,131) | (6,849)
Recognized in net earnings (loss) | 1,120 | 572
Effect of foreign currency exchange differences | 55 | 146
Ending Balance | (4,956) | (6,131)
Other Deferred Tax Liabilities [Member] |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning Balance | (10,169) | (11,752)
Recognized in net earnings (loss) | 537 | 1,260
Effect of foreign currency exchange differences | 15 | 323
Ending Balance | $ (9,617) | $ (10,169)

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- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in deferred tax liability (asset) resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Deferred tax liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81&doctype=Standard -URIDate 2020-01-01 + Details
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