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Significant Accounting Policies - Additional Information (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Significant Accounting Policies [Line Items]      
Cash and cash equivalents original maturity   three months or less  
Carrying value of right of use assets $ 73,464 $ 66,142 $ 0
Weighted average incremental borrowing rates applied 6.10%    
Deferred base rent balance $ 3,000    
Top of Range [Member]      
Disclosure Of Significant Accounting Policies [Line Items]      
Operating leases, remaining term 12 months    
Top of Range [Member] | Software [Member]      
Disclosure Of Significant Accounting Policies [Line Items]      
Expected useful life of intangible asset   10 years