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Retirement Benefits Plan - Summary of defined contribution plans (Detail) - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Defined Contribution Plans Explanatory [Abstract]      
Defined contribution plans $ 4,567 $ 4,514 $ 5,485
401(k) matched savings plan 3,025 3,912 4,556
Net pension expense $ 7,592 $ 8,426 $ 10,041