XML 163 R90.htm IDEA: XBRL DOCUMENT v3.20.4
Summary of Movement in Temporary Differences of Deferred Tax Liabilities (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]    
Beginning Balance $ 20,665 $ 35,899
Recognized in net earnings (loss) 5,664 (16,037)
Recognized in other comprehensive income (5,398)  
Effect of foreign currency exchange differences (793) 803
Ending Balance 20,138 20,665
Property, Plant and Equipment and Intangibles [member]    
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]    
Beginning Balance 426,934 467,109
Recognized in net earnings (loss) (28,600) (26,825)
Effect of foreign currency exchange differences (4,703) (13,350)
Ending Balance 393,631 426,934
Partnership Deferrals [member]    
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]    
Beginning Balance 850 1,730
Recognized in net earnings (loss) 1,682 (880)
Ending Balance 2,532 850
Other Deferred Tax Liabilities [Member]    
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]    
Beginning Balance 7,926 5,722
Recognized in net earnings (loss) (1,601) 2,216
Effect of foreign currency exchange differences (3) (12)
Ending Balance 6,322 7,926
Losses [member]    
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]    
Beginning Balance (402,025) (423,595)
Recognized in net earnings (loss) 33,141 7,874
Recognized in other comprehensive income (5,398)  
Effect of foreign currency exchange differences 3,843 13,696
Ending Balance (370,439) (402,025)
Debt Issue Costs [Member]    
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]    
Beginning Balance 3,280 3,534
Recognized in net earnings (loss) (615) (254)
Ending Balance 2,665 3,280
Long-Term Incentive Plan [member]    
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]    
Beginning Balance (6,131) (6,849)
Recognized in net earnings (loss) 1,120 572
Effect of foreign currency exchange differences 55 146
Ending Balance (4,956) (6,131)
Other Deferred Tax Liabilities [Member]    
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]    
Beginning Balance (10,169) (11,752)
Recognized in net earnings (loss) 537 1,260
Effect of foreign currency exchange differences 15 323
Ending Balance $ (9,617) $ (10,169)