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Other Assets - Additional Information (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of investments held for self insured liabilities maturity of bond portfolio at fair value [line items]    
Changes in provisions and indemnification assets $ 1.8 $ 0.2
Bottom of range [member]    
Disclosure of investments held for self insured liabilities maturity of bond portfolio at fair value [line items]    
Bonds interest rate 0.75% 0.75%
Top of range [member]    
Disclosure of investments held for self insured liabilities maturity of bond portfolio at fair value [line items]    
Bonds interest rate 5.15% 5.15%