Employee Benefits - Pension and Other Defined Contribution Retirement Plan Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	$ 771	$ 984	$ 2,314	$ 2,952
Interest cost on projected benefit obligation	6,007	5,954	18,020	17,860
Expected return on plan assets	(8,069)	(8,083)	(24,208)	(24,248)
Net amortization and deferrals	1,387	5,203	4,159	15,607
Total postretirement benefit (income) expense	96	4,058	285	12,171
Total expense	1,307	5,905	6,108	18,246
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	3,863	4,220	11,443	12,659
Interest cost on projected benefit obligation	6,372	6,283	18,890	18,848
Expected return on plan assets	(11,985)	(12,712)	(35,526)	(38,137)
Net amortization and deferrals	3,286	3,397	9,738	10,189
Total postretirement benefit (income) expense	1,536	1,188	4,545	3,559
Total expense	3,241	3,111	9,720	8,770
United States Postretirement Benefit Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution and other retirement plans	1,211	1,847	5,823	6,075
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution and other retirement plans	$ 1,705	$ 1,923	$ 5,175	$ 5,211