Employee Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
U.S. Defined Benefit Pension Plans
Net periodic benefit cost
Service cost	$ 86	$ 84	$ 172	$ 168
Interest cost	356	369	712	738
Expected return on plan assets	(433)	(519)	(866)	(1,038)
Net amortization/deferrals	248	229	496	458
Curtailment loss recognized	0	0	0	0
Net periodic benefit cost	257	163	$ 514	$ 326
Assumptions
Discount Rate			3.95%	4.21%
Expected long-term rate of return			4.95%	5.70%
Rate of compensation increase			3.00%	3.00%
International Defined Benefit Pension Plans
Net periodic benefit cost
Service cost	614	473	$ 1,228	$ 728
Interest cost	1,677	1,486	3,354	2,936
Expected return on plan assets	(2,910)	(2,405)	(5,820)	(5,286)
Net amortization/deferrals	685	620	1,370	1,055
Curtailment loss recognized	0	240	0	240
Net periodic benefit cost	66	414	$ 132	$ (327)
Assumptions
Discount Rate			2.51%	3.56%
Expected long-term rate of return			4.93%	5.81%
Rate of compensation increase			2.54%	3.10%
U.S. Post Retirement
Net periodic benefit cost
Service cost	1	1	$ 2	$ 2
Interest cost	88	97	176	194
Net amortization/deferrals	(73)	(105)	(146)	(210)
Net periodic benefit cost	16	(7)	$ 32	$ (14)
Assumptions
Discount Rate			3.76%	3.95%
International Post Retirement
Net periodic benefit cost
Service cost	7	7	$ 14	$ 14
Interest cost	24	25	48	50
Net amortization/deferrals	(7)	(9)	(14)	(18)
Net periodic benefit cost	$ 24	$ 23	$ 48	$ 46
Assumptions
Discount Rate			3.46%	3.90%