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Summary of Movement in Temporary Differences of Deferred Tax Liabilities (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]    
Beginning Balance $ 174,618  
Ending Balance 118,911 $ 174,618
Property, Plant and Equipment and Intangibles [member]    
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]    
Beginning Balance 629,967 637,106
Recognized in net loss (149,489) 5,960
Effect of foreign currency exchange differences (25,865) (13,099)
Ending Balance 454,613 629,967
Partnership Deferrals [member]    
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]    
Beginning Balance (16,447) 12,604
Recognized in net loss 16,112 (29,051)
Ending Balance (335) (16,447)
Other Deferred Income Tax Liabilities [Member]    
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]    
Beginning Balance 6,159 4,668
Recognized in net loss 545 1,483
Effect of foreign currency exchange differences 5 8
Ending Balance 6,709 6,159
Losses [member]    
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]    
Beginning Balance (418,253) (335,966)
Recognized in net loss 24,124 (88,119)
Recognized in other comprehensive loss   (2,933)
Effect of foreign currency exchange differences 25,996 8,765
Ending Balance (368,133) (418,253)
Debt Issue Costs [Member]    
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]    
Beginning Balance 4,215 5,802
Recognized in net loss (863) (1,587)
Ending Balance 3,352 4,215
Long-Term Incentive Plan [member]    
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]    
Beginning Balance (18,270) (12,477)
Recognized in net loss 9,651 (5,979)
Effect of foreign currency exchange differences 684 186
Ending Balance (7,935) (18,270)
Other Deferred Income Tax Assets [member]    
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]    
Beginning Balance (12,753) (8,271)
Recognized in net loss 1,230 (4,543)
Effect of foreign currency exchange differences 341 61
Ending Balance (11,182) (12,753)
Net Deferred Income Tax Liability [member]    
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]    
Beginning Balance 174,618 303,466
Recognized in net loss (98,690) (121,836)
Recognized in other comprehensive loss   (2,933)
Effect of foreign currency exchange differences 1,161 (4,079)
Ending Balance $ 77,089 $ 174,618