Pension and Postretirement Benefit Obligations - Components of Net Periodic Pension Cost (Detail) - Pension Plans [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,207	$ 1,412	$ 3,620	$ 4,237
Interest cost	3,063	2,856	9,188	8,568
Expected return on plan assets	(2,574)	(3,853)	(7,722)	(11,557)
Recognized net actuarial loss	901	934	2,702	2,800
Amortization of prior service cost	5	6	17	18
Net periodic benefit cost	$ 2,602	$ 1,355	$ 7,805	$ 4,066