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Other Financial Assets - Additional Information (Detail) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of investments held for self insured liabilities maturity of bond portfolio at fair value [line items]    
Changes in provisions and indemnification assets CAD 0.2 CAD 1.2
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% 0.88%
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% 4.88%