XML 126 R88.htm IDEA: XBRL DOCUMENT v3.8.0.1
Employee Benefit Plan - Additional Information (Detail) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Employees Benefit [Abstract]    
Individual contributions under defined contribution pension plan 5.00%  
Total expense under the defined contribution plan $ 10.4 $ 8.6