Pension and Other Post-Retirement Benefit Plans (Detail) - Pension Plan - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
U.S. Pension Plans and Other Post-Retirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 33	$ 0	$ 100
Interest cost	418	449	1,254	1,346
Expected return on plan assets	(787)	(671)	(2,360)	(2,013)
Amortization of prior service cost	2	2	5	5
Recognized actuarial loss	69	89	206	268
Net (benefit) cost	(298)	(98)	(895)	(294)
Non-U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	265	289	821	845
Expected return on plan assets	(310)	(302)	(960)	(882)
Amortization of prior service cost	0	0	0	0
Recognized actuarial loss	126	122	393	358
Net (benefit) cost	$ 81	$ 109	$ 254	$ 321