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Summary of Net Deferred Tax Liability (Detail) - CAD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax liability:    
Property, plant and equipment and intangibles $ 359,383 $ 393,631
Debt issue costs 1,457 2,665
Partnership deferrals 11,082 2,532
Other 6,221 6,322
Deferred income tax liability 378,143 405,150
Offsetting of assets and liabilities (365,924) (383,914)
Deferred tax liabilities 12,219 21,236
Deferred tax assets:    
Losses (expire from time to time up to 2041) 340,406 370,439
Long-term incentive plan 14,264 4,956
Other 12,121 9,617
Deferred income tax asset 366,791 385,012
Offsetting of assets and liabilities (365,924) (383,914)
Deferred tax assets 867 1,098
Net deferred tax liability $ 11,352 $ 20,138