Pension and Other Post-Retirement Benefit Plans (Detail) - Pension Plan - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
U.S. Pension Plans and Other Post-Retirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 33	$ 32	$ 66	$ 64
Interest cost	449	473	897	946
Expected return on plan assets	(671)	(678)	(1,342)	(1,356)
Amortization of prior service cost	2	2	3	4
Recognized actuarial loss	89	81	179	163
Net (benefit) cost	(98)	(90)	(197)	(179)
Non-U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	283	350	565	709
Expected return on plan assets	(295)	(389)	(590)	(787)
Amortization of prior service cost	0	0	0	0
Recognized actuarial loss	120	54	239	109
Net (benefit) cost	$ 108	$ 15	$ 214	$ 31