Information on Reportable Segments (Detail) (CAD) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Apr. 01, 2012
Segment Reporting Information [Line Items]
Revenues	731,537	[1]	721,284	[1]
Operating Income (Loss)	127,917		131,623
Interest, Net	(7,735)		(7,187)
Capital Expenditures	47,479		34,269
Income before income taxes	120,182		124,436
Canada
Segment Reporting Information [Line Items]
Revenues	593,673	[1]	599,883	[1]
Operating Income (Loss)	145,821		147,226
Capital Expenditures	30,276		23,782
U.S.
Segment Reporting Information [Line Items]
Revenues	44,448	[1]	38,429	[1]
Operating Income (Loss)	910		1,654
Capital Expenditures	15,361		7,992
Corporate Services
Segment Reporting Information [Line Items]
Revenues	4,125	[1]	4,471	[1]
Operating Income (Loss)	(10,665)		(18,785)
Capital Expenditures	1,842		2,495
Reportable Segment
Segment Reporting Information [Line Items]
Revenues	642,246	[1]	642,783	[1]
Operating Income (Loss)	136,066		130,095
VIEs
Segment Reporting Information [Line Items]
Revenues	89,291	[1]	78,501	[1]
Operating Income (Loss)	1,326		1,528
Corporate Reorganization Expenses
Segment Reporting Information [Line Items]
Operating Income (Loss)	(9,475)		0

[1] There are no inter-segment revenues included in the above table.