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Summary of Net Deferred Tax Liability (Detail) - CAD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred income tax liability:    
Property, plant and equipment and intangibles $ 454,613 $ 629,967
Debt issue costs 3,352 4,215
Other 6,709 6,159
Deferred income tax liability 464,674 640,341
Offsetting of assets and liabilities (345,763) (465,723)
Deferred tax liabilities 118,911 174,618
Deferred income tax assets:    
Losses (expire from time to time up to 2036) 368,133 418,253
Partnership deferrals 335 16,447
Long-term incentive plan 7,935 18,270
Other 11,182 12,753
Deferred income tax asset 387,585 465,723
Offsetting of assets and liabilities (345,763) (465,723)
Deferred tax assets 41,822  
Net deferred income tax liability $ 77,089 $ 174,618