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Pension and Postretirement Benefit Obligations - Components of Net Periodic Postretirement Benefit Cost (Detail) - Net Postretirement Benefits Activity [Member] - USD ($)
$ in Thousands
3 Months Ended
Apr. 01, 2018
Apr. 02, 2017
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 502 $ 572
Interest cost 696 911
Recognized net actuarial loss 499 648
Amortization of prior service cost (462) (746)
Net periodic pension cost $ 1,235 $ 1,385