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Summary of Net Deferred Tax Liability (Detail) - CAD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax liability:    
Property, plant and equipment and intangibles $ 393,631 $ 426,934
Debt issue costs 2,665 3,280
Partnership deferrals 2,532 850
Other 6,322 7,926
Deferred income tax liability 405,150 438,990
Offsetting of assets and liabilities (383,914) (413,601)
Deferred tax liabilities 21,236 25,389
Deferred tax assets:    
Losses (expire from time to time up to 2040) 370,439 402,025
Long-term incentive plan 4,956 6,131
Other 9,617 10,169
Deferred income tax asset 385,012 418,325
Offsetting of assets and liabilities (383,914) (413,601)
Deferred tax assets 1,098 4,724
Net deferred tax liability $ 20,138 $ 20,665