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Summary of Net Deferred Tax Liability (Detail) - CAD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax liability:    
Property, plant and equipment and intangibles $ 426,934 $ 467,109
Debt issue costs 3,280 3,534
Partnership deferrals 850 1,730
Other 7,926 5,722
Deferred income tax liability 438,990 478,095
Offsetting of assets and liabilities (413,601) (405,316)
Deferred tax liabilities 25,389 72,779
Deferred tax assets:    
Losses (expire from time to time up to 2038) 402,025 423,595
Long-term incentive plan 6,131 6,849
Other 10,169 11,752
Deferred income tax asset 418,325 442,196
Offsetting of assets and liabilities (413,601) (405,316)
Deferred tax assets 4,724 36,880
Net deferred tax liability $ 20,665 $ 35,899