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Employee Benefit Plans - Components of Net Periodic Pension Cost for Defined Benefit Pension Plan and Retirement Plan (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 04, 2015
Jun. 28, 2014
Jul. 04, 2015
Jun. 28, 2014
Compensation and Retirement Disclosure [Abstract]        
Service cost $ 197 $ 173 $ 393 $ 346
Interest cost 337 319 675 638
Expected return on plan assets (373) (351) (747) (701)
Amortization of actuarial losses 221 105 443 210
Net periodic pension cost $ 382 $ 246 $ 764 $ 493