Pension and Postretirement Benefit Obligations - Components of Net Periodic Pension Cost (Detail) - Pension Plans [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,207	$ 1,412
Interest cost	3,063	2,856
Expected return on plan assets	(2,574)	(3,852)
Recognized net actuarial loss	901	933
Amortization of prior service cost	5	6
Net periodic benefit cost	$ 2,602	$ 1,355