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Summary of Movement in Temporary Differences of Deferred Tax Liabilities (Detail) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning Balance | $ 35,899 | $ 77,089
Recognized in net loss (earnings) | (16,037) | (37,899)
Effect of foreign currency exchange differences | 803 | (3,291)
Ending Balance | 20,665 | 35,899
Property, Plant and Equipment and Intangibles [member] |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning Balance | 467,109 | 454,613
Recognized in net loss (earnings) | (26,825) | (9,667)
Effect of foreign currency exchange differences | (13,350) | 22,163
Ending Balance | 426,934 | 467,109
Partnership Deferrals [member] |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning Balance | 1,730 | (335)
Recognized in net loss (earnings) | (880) | 2,065
Ending Balance | 850 | 1,730
Other Deferred Tax Liabilities [Member] |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning Balance | 5,722 | 6,709
Recognized in net loss (earnings) | 2,216 | (1,005)
Effect of foreign currency exchange differences | (12) | 18
Ending Balance | 7,926 | 5,722
Losses [member] |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning Balance | (423,595) | (368,133)
Recognized in net loss (earnings) | 7,874 | (30,660)
Effect of foreign currency exchange differences | 13,696 | (24,802)
Ending Balance | (402,025) | (423,595)
Debt Issue Costs [Member] |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning Balance | 3,534 | 3,352
Recognized in net loss (earnings) | (254) | 182
Ending Balance | 3,280 | 3,534
Long-Term Incentive Plan [member] |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning Balance | (6,849) | (7,935)
Recognized in net loss (earnings) | 572 | 1,325
Effect of foreign currency exchange differences | 146 | (239)
Ending Balance | (6,131) | (6,849)
Other Deferred Tax Liabilities [Member] |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning Balance | (11,752) | (11,182)
Recognized in net loss (earnings) | 1,260 | (139)
Effect of foreign currency exchange differences | 323 | (431)
Ending Balance | $ (10,169) | $ (11,752)

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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 2019-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 81 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81&doctype=Standard -URIDate 2019-03-27 + Details
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