Employee Benefit Plans - Components of Net Periodic Pension Cost for Defined Benefit Pension Plan and Retirement Plan (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Retirement Benefits [Abstract]
Service cost	$ 126	$ 150	$ 377	$ 450
Interest cost	347	317	1,041	951
Expected return on plan assets	(411)	(446)	(1,233)	(1,338)
Amortization of actuarial losses	221	185	664	557
Net periodic pension cost	$ 283	$ 206	$ 849	$ 620