Employee Benefit Plans - Components of Net Periodic Pension Cost for Defined Benefit Pension Plan and Retirement Plan (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Retirement Benefits [Abstract]
Service cost	$ 155	$ 126
Interest cost	302	347
Expected return on plan assets	(440)	(411)
Amortization of actuarial losses	249	221
Net periodic pension cost	$ 266	$ 283