Pension and Other Post-Retirement Benefit Plans (Detail) - Pension Plan - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
U.S. Pension Plans and Other Post-Retirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 33	$ 32	$ 100	$ 96
Interest cost	449	469	1,346	1,407
Expected return on plan assets	(671)	(678)	(2,013)	(2,034)
Amortization of prior service cost	2	0	5	0
Recognized actuarial loss	89	107	268	321
Net (benefit) cost	(98)	(70)	(294)	(210)
Non-U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	289	338	845	1,041
Expected return on plan assets	(302)	(375)	(882)	(1,156)
Amortization of prior service cost	0	0	0	0
Recognized actuarial loss	122	52	358	160
Net (benefit) cost	$ 109	$ 15	$ 321	$ 45