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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
Mar. 30, 2014
Mar. 31, 2013
Postretirement Benefits [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 383 $ 413
Interest cost 825 715
Recognized net actuarial loss 563 700
Amortization of prior service cost (378) (378)
Net periodic pension cost (benefit) $ 1,393 $ 1,450