Schedule of Net Periodic Pension and Postretirement benefit Cost (Income) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2018	Apr. 02, 2017
United States Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Service cost	$ 571	$ 560
Interest cost	2,997	3,312
Expected return on plan assets	(3,369)	(3,000)
Amortization of prior service cost	14	18
Total	213	890
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Service cost	213	185
Interest cost	186	163
Expected return on plan assets	(5)	(6)
Total	394	342
Postretirement Benefit Plans
Defined Benefit Plan Disclosure
Service cost	9	10
Interest cost	50	50
Amortization of prior service credit	(93)	(124)
Special termination benefits	1,626
Total	$ 1,592	$ (64)