Pension and Other Post-Retirement Benefit Plans (Detail) - Pension Plan - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
U.S. Pension Plans and Other Post-Retirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 447	$ 418	$ 894	$ 836
Expected return on plan assets	(573)	(787)	(1,324)	(1,574)
Amortization of prior service cost 1	2,496	2	2,497	3
Recognized actuarial loss	83	69	165	138
Net cost (benefit)	2,453	(298)	2,232	(597)
Non-U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Interest cost	279	270	563	556
Expected return on plan assets	(280)	(316)	(566)	(650)
Amortization of prior service cost 1	12	0	24	0
Recognized actuarial loss	131	130	269	267
Net cost (benefit)	$ 142	$ 84	$ 290	$ 173