Pension and Postretirement Benefit Obligations - Components of Net Periodic Pension Cost (Detail) - Pension Plans - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,659	$ 1,207
Interest cost	2,760	3,063
Expected return on plan assets	(3,383)	(2,574)
Recognized net actuarial loss	1,189	901
Amortization of prior service cost	5	5
Net periodic pension/postretirement benefit cost	$ 2,230	$ 2,602