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Summary of Accumulated Other Comprehensive Income (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Accumulated Other Comprehensive Income Loss [Line Items]    
Beginning Balance $ 162,014  
Other comprehensive income (loss) (27,759) $ 30,404
Ending Balance 134,255 162,014
Unrealized Foreign Currency Translation Gains (Losses) [member]    
Disclosure Of Accumulated Other Comprehensive Income Loss [Line Items]    
Beginning Balance 616,363 440,733
Other comprehensive income (loss) (106,781) 175,630
Ending Balance 509,582 616,363
Foreign Exchange Gain (Loss) on Net Investment Hedge [member]    
Disclosure Of Accumulated Other Comprehensive Income Loss [Line Items]    
Beginning Balance (454,349) (309,123)
Other comprehensive income (loss) 79,022 (145,226)
Ending Balance (375,327) (454,349)
Accumulated Other Comprehensive Income [Member]    
Disclosure Of Accumulated Other Comprehensive Income Loss [Line Items]    
Beginning Balance 162,014 131,610
Other comprehensive income (loss) (27,759) 30,404
Ending Balance $ 134,255 $ 162,014