Benefit Plans - Net Periodic Pension Cost (Detail) (Pension Plans [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 32	$ 27	$ 64	$ 55
Interest cost	3,086	3,123	6,172	6,247
Expected return on plan assets	(3,547)	(2,972)	(7,094)	(5,945)
Amortization of prior service cost	4	5	8	10
Recognized net actuarial loss	838	694	1,676	1,387
Net periodic pension cost	$ 413	$ 877	$ 826	$ 1,754