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Schedule of Issued Capital (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Classes Of Share Capital [Abstract]    
Beginning balance, shares 293,781,836 293,238,858
Share repurchase (16,482,032)  
Issued on redemption of non-management directors' DSUs, shares   476,978
Options exercised - cash consideration, shares   66,000
Ending balance, shares 277,299,804 293,781,836
Beginning balance $ 2,322,280 $ 2,319,293
Share repurchase (25,902)  
Issued on redemption of non-management directors' DSUs   2,609
Options exercised – cash consideration   275
– reclassification from contributed surplus   103
Ending balance $ 2,296,378 $ 2,322,280