Employee Benefits - Pension and Other Defined Contribution Retirement Plan Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	$ 984	$ 530	$ 2,952	$ 2,299
Interest cost on projected benefit obligation	5,954	6,349	17,860	18,812
Expected return on plan assets	(8,083)	(6,906)	(24,248)	(20,732)
Net amortization and deferrals	5,203	4,720	15,607	13,229
Total postretirement benefit expense	4,058	4,693	12,171	13,608
Total expense	5,905	6,657	18,246	19,474
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	4,220	2,772	12,659	10,722
Interest cost on projected benefit obligation	6,283	8,298	18,848	25,250
Expected return on plan assets	(12,712)	(12,576)	(38,137)	(37,731)
Net amortization and deferrals	3,397	2,058	10,189	8,012
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	0	32	0	32
Total postretirement benefit expense	1,188	584	3,559	6,285
Total expense	3,111	2,470	8,770	10,793
United States Postretirement Benefit Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution and other retirement plans	1,847	1,964	6,075	5,866
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution and other retirement plans	$ 1,923	$ 1,886	$ 5,211	$ 4,508