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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

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