Pension and Other Postretirement Benefits - Net Periodic Pension and Other Postretirement Costs (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Curtailment (credit) charge			$ (887)
U.S. Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 453	$ 537	1,264	$ 2,207
Interest cost	2,606	1,971	7,380	6,019
Expected return on plan assets	(3,508)	(2,752)	(9,928)	(8,244)
Amortization of prior service cost	10	78	33	293
Amortization of actuarial loss	831	1,315	2,493	4,124
Curtailment (credit) charge	0	0	(887)	1,217
Net benefit (income) cost	392	1,149	355	5,616
Foreign Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	94	0	223	0
Interest cost	563	602	1,727	1,803
Expected return on plan assets	(607)	(674)	(1,897)	(2,019)
Amortization of actuarial loss	165	212	516	636
Net benefit (income) cost	215	140	569	420
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	135	96	371	288
Interest cost	192	118	546	355
Amortization of prior service cost	(357)	(168)	(872)	(504)
Amortization of actuarial loss	9	7	27	20
Net benefit (income) cost	$ (21)	$ 53	$ 72	$ 159