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Benefit Plans - Components of Net Periodic Postretirement Benefit Cost (Detail) - Postretirement Benefits [Member] - USD ($)
$ in Thousands
3 Months Ended
Apr. 03, 2016
Apr. 03, 2015
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 350 $ 325
Interest cost 778 708
Recognized net actuarial loss 587 717
Amortization of prior service cost (840) (840)
Net periodic pension cost $ 875 $ 910