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Benefit Plans - Components of Net Periodic Pension Cost (Benefit) (Detail) - Pension Plans [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 28, 2015
Jun. 29, 2014
Jun. 28, 2015
Jun. 29, 2014
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 35 $ 29 $ 70 $ 58
Interest cost 2,973 2,896 5,947 5,792
Expected return on plan assets (3,386) (3,456) (6,774) (6,913)
Amortization of prior service cost 9 9 18 18
Recognized net actuarial loss 795 422 1,591 844
Net periodic pension cost (benefit) $ 426 $ (100) $ 852 $ (201)