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Benefit Plans - Components of Net Periodic Postretirement Benefit Cost (Detail) (Postretirement Benefits [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
Postretirement Benefits [Member]
       
Pension Plans, Postretirement and Other Employee Benefits [Line Items]        
Service cost $ 413 $ 316 $ 826 $ 632
Interest cost 715 782 1,430 1,563
Recognized net actuarial loss 700 612 1,400 1,225
Amortization of prior service cost (378) (379) (756) (758)
Net periodic pension cost $ 1,450 $ 1,331 $ 2,900 $ 2,662