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Accounting Changes - Disclosure of comparative information prepared under previous GAAP (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Profit (loss) [abstract]      
Revenues $ 2,249,000 $ 2,307,000 $ 2,397,000
(Note 6) (1,100,000) (1,016,000) (963,000)
Net interest expense (250,000) (247,000) (229,000)
Net earnings (loss) (90,000) (118,000) $ 276,000
Statement of financial position [abstract]      
Deferred income tax liabilities (Note 11) 501,000 549,000  
Contract liability 87,000 62,000  
Deficit (1,496,000) $ (1,209,000)  
Previous GAAP [member]      
Profit (loss) [abstract]      
Revenues 2,253,000    
(Note 6) (1,109,000)    
Net interest expense (243,000)    
Net earnings (loss) (88,000)    
Statement of financial position [abstract]      
Deferred income tax liabilities (Note 11) 505,000    
Contract liability 68,000    
Deficit (1,481,000)    
Effect of transition to IFRSs [member]      
Profit (loss) [abstract]      
Revenues (4,000)    
(Note 6) 9,000    
Net interest expense (7,000)    
Net earnings (loss) (2,000)    
Statement of financial position [abstract]      
Deferred income tax liabilities (Note 11) (4,000)    
Contract liability 19,000    
Deficit $ (15,000)