Stock-Based Compensation - Additional Information (Detail) (CAD) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Apr. 01, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net (gain) loss from derivatives not designated as hedging instruments	(7,032)	(2,484)
TRS | General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net (gain) loss from derivatives not designated as hedging instruments	(6,753)	(3,232)
Deferred Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
DSUs granted, shares	4,300	4,400
DSUs granted, value	50.07	52.80
DSUs settled, shares	0	0