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Expected Non-cancellable Undiscounted Operating Lease Payments (Detail) - CAD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Disclosure of finance lease and operating lease by lessee [Line Items]
Non-cancellable undiscounted operating lease	$ 47,180	$ 56,637
Less than one year [member]
Disclosure of finance lease and operating lease by lessee [Line Items]
Non-cancellable undiscounted operating lease	10,960	11,954
One to five years [member]
Disclosure of finance lease and operating lease by lessee [Line Items]
Non-cancellable undiscounted operating lease	29,630	33,566
More than five years [member]
Disclosure of finance lease and operating lease by lessee [Line Items]
Non-cancellable undiscounted operating lease	$ 6,590	$ 11,117