Pensions and Other Post-employment Benefits (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2019	Mar. 30, 2018
Pension Benefits [Member]
Components of net periodic benefit cost
Service cost	$ 1,340	$ 1,674
Interest cost	1,557	2,397
Expected return on plan assets	(2,123)	(3,697)
Amortization of prior service benefit	120	(31)
Amortization of net loss (gain)	804	1,960
Total net benefit cost	1,698	2,303
Other Benefits [Member]
Components of net periodic benefit cost
Service cost	17	28
Interest cost	100	99
Expected return on plan assets	0	0
Amortization of prior service benefit	(374)	(374)
Amortization of net loss (gain)	(23)	0
Total net benefit cost	$ (280)	$ (247)