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Amounts Recognized as Expenses in Respect of Operating Leases (Detail) - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Lease And Sublease Payments Recognised As Expense [Abstract]    
Operating leases $ 17,187 $ 16,311
Sub-lease recoveries (540) (441)
Operating leases and sublease recoveries recognised as expense $ 16,647 $ 15,870