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Benefit Plans - Components of Net Periodic Pension Cost (Benefit) (Detail) - Pension Plans [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 27, 2015
Sep. 28, 2014
Sep. 27, 2015
Sep. 28, 2014
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 35 $ 26 $ 105 $ 84
Interest cost 2,974 2,904 8,921 8,696
Expected return on plan assets (3,388) (3,430) (10,162) (10,343)
Amortization of prior service cost 9 9 27 27
Recognized net actuarial loss 795 450 2,386 1,294
Net periodic pension cost (benefit) $ 425 $ (41) $ 1,277 $ (242)