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Summary of Accumulated Other Comprehensive Income (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Accumulated Other Comprehensive Income Loss [Line Items]    
Beginning Balance $ 134,255  
Other comprehensive income (loss) 3,326 $ (27,759)
Ending Balance 137,581 134,255
Unrealized Foreign Currency Translation Gains (Losses) [member]    
Disclosure Of Accumulated Other Comprehensive Income Loss [Line Items]    
Beginning Balance 509,582 616,363
Other comprehensive income (loss) (25,925) (106,781)
Ending Balance 483,657 509,582
Foreign Exchange Gain (Loss) on Net Investment Hedge [member]    
Disclosure Of Accumulated Other Comprehensive Income Loss [Line Items]    
Beginning Balance (375,327) (454,349)
Other comprehensive income (loss) 23,853 79,022
Ending Balance (351,474) (375,327)
Tax Benefit Related to Net Investment Hedge of Long Term Debt [member]    
Disclosure Of Accumulated Other Comprehensive Income Loss [Line Items]    
Other comprehensive income (loss) 5,398  
Ending Balance 5,398  
Accumulated Other Comprehensive Income [Member]    
Disclosure Of Accumulated Other Comprehensive Income Loss [Line Items]    
Beginning Balance 134,255 162,014
Other comprehensive income (loss) 3,326 (27,759)
Ending Balance $ 137,581 $ 134,255