Summary of (Gain) Loss on Derivatives Not Designated as Hedging Instruments (Detail) (CAD) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Apr. 01, 2012
Effect of derivatives on statements of operations [Line Items]
Net (gain) loss from derivatives not designated as hedging instruments	(7,032)	(2,484)
TRS | General and Administrative Expense
Effect of derivatives on statements of operations [Line Items]
Net (gain) loss from derivatives not designated as hedging instruments	(6,753)	(3,232)
Forward Currency Contracts | Cost Of Sales
Effect of derivatives on statements of operations [Line Items]
Net (gain) loss from derivatives not designated as hedging instruments	(279)	748