Employee Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Pension Plan | U.S.
Net periodic benefit cost
Service cost	$ 71	$ 87	$ 142	$ 174
Interest cost	372	333	744	666
Expected return on plan assets	(433)	(445)	(866)	(890)
Net amortization/deferrals	207	243	414	486
Net periodic benefit cost (credit)	217	218	$ 434	$ 436
Assumptions
Discount Rate (as a percent)			4.30%	3.60%
Expected long-term rate of return (as a percent)			5.40%	5.20%
Rate of compensation increase (as a percent)			3.00%	3.00%
Pension Plan | International
Net periodic benefit cost
Service cost	611	691	$ 1,222	$ 1,382
Interest cost	1,711	1,834	3,422	3,668
Expected return on plan assets	(2,927)	(3,466)	(5,854)	(6,932)
Net amortization/deferrals	641	554	1,282	1,108
Net periodic benefit cost (credit)	36	(387)	$ 72	$ (774)
Assumptions
Discount Rate (as a percent)			2.50%	2.40%
Expected long-term rate of return (as a percent)			5.00%	5.10%
Rate of compensation increase (as a percent)			2.60%	2.60%
Other Postretirement Benefit Plan | U.S.
Net periodic benefit cost
Service cost	1	1	$ 2	$ 2
Interest cost	89	81	178	162
Net amortization/deferrals	(101)	(76)	(202)	(152)
Net periodic benefit cost (credit)	(11)	6	$ (22)	$ 12
Assumptions
Discount Rate (as a percent)			4.17%	3.43%
Other Postretirement Benefit Plan | International
Net periodic benefit cost
Service cost	2	8	$ 4	$ 16
Interest cost	20	26	40	52
Net amortization/deferrals	(22)	(4)	(44)	(8)
Net periodic benefit cost (credit)	$ 0	$ 30	$ 0	$ 60
Assumptions
Discount Rate (as a percent)			3.49%	3.21%