Pension and Postretirement Benefit Obligations - Components of Net Periodic Pension Cost (Detail) - Pension Plans [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,206	$ 1,413	$ 2,413	$ 2,825
Interest cost	3,062	2,856	6,125	5,712
Expected return on plan assets	(2,574)	(3,852)	(5,148)	(7,704)
Recognized net actuarial loss	900	933	1,801	1,866
Amortization of prior service cost	7	6	12	12
Net periodic benefit cost	$ 2,601	$ 1,356	$ 5,203	$ 2,711