Pension and Other Post-Retirement Benefit Plans (Detail) - Pension Plan - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
U.S. Pension Plans and Other Post-Retirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 33
Interest cost	418	449
Expected return on plan assets	(787)	(671)
Amortization of prior service cost	2	2
Recognized actuarial loss	69	89
Net (benefit) cost	(298)	(98)
Non-U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	287	271
Expected return on plan assets	(335)	(285)
Amortization of prior service cost	0	0
Recognized actuarial loss	137	115
Net (benefit) cost	$ 89	$ 101