Net Benefit Cost of Pension and Postretirement Benefit Plans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 432	$ 696	$ 1,361	$ 2,085
Interest cost	4,333	4,115	12,614	12,366
Expected return on Plan assets	(5,784)	(5,043)	(17,328)	(15,128)
Net amortization and deferral	1,556	1,604	4,380	4,814
Settlement charge				(124)
Curtailment charge				111
Net benefit cost	537	1,372	1,027	4,124
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	176	159	501	475
Interest cost	543	473	2,084	1,419
Net amortization and deferral	137	123	1,069	368
Net benefit cost	$ 856	$ 755	$ 3,654	$ 2,262