Net Benefit Cost of Pension and Postretirement Benefit Plans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Apr. 01, 2012
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 465	$ 678
Interest cost	4,139	4,126
Expected return on plan assets	(5,770)	(5,043)
Net amortization and deferral	1,410	1,606
Net benefit cost	244	1,367
Other Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	164	158
Interest cost	999	473
Net amortization and deferral	730	123
Net benefit cost	$ 1,893	$ 754