Schedule of Net Periodic Pension and Postretirement (income) Cost (Detail) - 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
Net actuarial (gain) loss			$ 448	$ 196
UNITED STATES
Defined Benefit Plan Disclosure
Service cost	$ 402	$ 538	1,206	1,657
Interest cost	1,797	1,750	5,392	7,188
Expected return on plan assets	(1,510)	(1,551)	(4,531)	(7,484)
Amortization of prior service cost		14		43
Net actuarial (gain) loss			252	(189)
Settlement loss		267		345
Total net periodic pension cost	689	1,018	2,319	1,560
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Service cost	183	203	550	609
Interest cost	168	177	505	532
Expected return on plan assets	(7)	(5)	(21)	(15)
Total net periodic pension cost	344	375	1,034	1,126
Postretirement Benefit Plans
Defined Benefit Plan Disclosure
Service cost	10	10	31	29
Interest cost	87	49	260	147
Amortization of prior service cost	(48)	(93)	(143)	(280)
Net actuarial (gain) loss			196	40
Special termination benefits		601		3,419
Total net periodic pension cost	$ 49	$ 567	$ 344	$ 3,355