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Summary of Net Deferred Tax Liability (Detail) - CAD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred income tax liability:    
Property, plant and equipment and intangibles $ 467,109 $ 454,613
Debt issue costs 3,534 3,352
Partnership deferrals 1,730  
Other 5,722 6,709
Deferred income tax liability 478,095 464,674
Offsetting of assets and liabilities (405,316) (345,763)
Deferred tax liabilities 72,779 118,911
Deferred income tax assets:    
Losses (expire from time to time up to 2037) 423,595 368,133
Partnership deferrals   335
Long-term incentive plan 6,849 7,935
Other 11,752 11,182
Deferred income tax asset 442,196 387,585
Offsetting of assets and liabilities (405,316) (345,763)
Deferred tax assets 36,880 41,822
Net deferred income tax liability $ 35,899 $ 77,089