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Summary of Movement in Temporary Differences of Deferred Tax Liabilities (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment and Intangibles [member]    
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]    
Beginning Balance $ 454,613 $ 629,967
Recognized in net loss (9,667) (149,489)
Effect of foreign currency exchange differences 22,163 (25,865)
Ending Balance 467,109 454,613
Partnership Deferrals [member]    
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]    
Beginning Balance (335) (16,447)
Recognized in net loss 2,065 16,112
Ending Balance 1,730 (335)
Other Deferred Income Tax Liabilities [Member]    
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]    
Beginning Balance 6,709 6,159
Recognized in net loss (1,005) 545
Effect of foreign currency exchange differences 18 5
Ending Balance 5,722 6,709
Losses [member]    
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]    
Beginning Balance (368,133) (418,253)
Recognized in net loss (30,660) 24,124
Effect of foreign currency exchange differences (24,802) 25,996
Ending Balance (423,595) (368,133)
Debt Issue Costs [Member]    
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]    
Beginning Balance 3,352 4,215
Recognized in net loss 182 (863)
Ending Balance 3,534 3,352
Long-Term Incentive Plan [member]    
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]    
Beginning Balance (7,935) (18,270)
Recognized in net loss 1,325 9,651
Effect of foreign currency exchange differences (239) 684
Ending Balance (6,849) (7,935)
Other Deferred Income Tax Assets [member]    
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]    
Beginning Balance (11,182) (12,753)
Recognized in net loss (139) 1,230
Effect of foreign currency exchange differences (431) 341
Ending Balance (11,752) (11,182)
Net Deferred Income Tax Liability [member]    
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]    
Beginning Balance 77,089 174,618
Recognized in net loss (37,899) (98,690)
Effect of foreign currency exchange differences (3,291) 1,161
Ending Balance $ 35,899 $ 77,089