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Summary of Movement in Temporary Differences of Deferred Tax Liabilities (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
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)