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Convertible Debentures - Summary of Detailed Information about Convertible Debentures (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Convertible debentures [line items]    
Beginning $ 226,853 $ 119,581
Fair value at issuance   27,891
Fair value adjustment 75,459 79,381
Settlement with shares (230,301)  
Ending 72,011 226,853
2016 Debentures [member]    
Convertible debentures [line items]    
Beginning 94,768 61,150
Fair value adjustment 30,291 33,618
Settlement with shares (125,059)  
Ending 0 94,768
2017 Debentures [member]    
Convertible debentures [line items]    
Beginning 86,568 58,431
Fair value adjustment 18,674 28,137
Settlement with shares (105,242)  
Ending 0 86,568
2020 Debentures [member]    
Convertible debentures [line items]    
Beginning 31,483  
Fair value at issuance   20,262
Fair value adjustment 15,427 11,221
Ending 46,910 31,483
ISO Energy Debentures [member]    
Convertible debentures [line items]    
Beginning 14,034  
Fair value at issuance   7,630
Fair value adjustment 11,067 6,404
Ending $ 25,101 $ 14,034