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
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Retirement Benefits [Abstract]
Service cost	$ 126	$ 150	$ 251	$ 300
Interest cost	347	317	694	634
Expected return on plan assets	(411)	(446)	(822)	(892)
Amortization of actuarial losses	221	186	443	372
Net periodic pension cost	$ 283	$ 207	$ 566	$ 414