Employee Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
U.S. Defined Benefit Pension Plans
Net periodic benefit cost
Service cost	$ 86	$ 84	$ 258	$ 252
Interest cost	356	369	1,068	1,107
Expected return on plan assets	(433)	(519)	(1,299)	(1,557)
Net amortization/deferrals	248	229	744	687
Curtailment loss recognized			0	0
Net periodic benefit cost	257	163	$ 771	$ 489
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	258	$ 1,842	$ 986
Interest cost	1,677	1,257	5,031	4,193
Expected return on plan assets	(2,910)	(2,437)	(8,730)	(7,723)
Net amortization/deferrals	685	397	2,055	1,452
Curtailment loss recognized			0	240
Net periodic benefit cost	66	(525)	$ 198	$ (852)
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	$ 3	$ 3
Interest cost	88	97	264	291
Net amortization/deferrals	(73)	(105)	(219)	(315)
Net periodic benefit cost	16	(7)	$ 48	$ (21)
Assumptions
Discount Rate			3.76%	3.95%
International Post Retirement
Net periodic benefit cost
Service cost	7	7	$ 21	$ 21
Interest cost	24	25	72	75
Net amortization/deferrals	(7)	(9)	(21)	(27)
Net periodic benefit cost	$ 24	$ 23	$ 72	$ 69
Assumptions
Discount Rate			3.46%	3.90%