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Benefit Plans - Components of Net Periodic Postretirement Benefit Cost Reconciliation (Detail) (Postretirement Benefits [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 29, 2014
Jun. 30, 2013
Jun. 29, 2014
Jun. 30, 2013
Postretirement Benefits [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 383 $ 413 $ 766 $ 826
Interest cost 825 715 1,650 1,430
Recognized net actuarial loss 563 700 1,126 1,400
Amortization of prior service cost (378) (378) (756) (756)
Net periodic pension cost (benefit) $ 1,393 $ 1,450 $ 2,786 $ 2,900