Employee Benefits - Pension and Other Defined Contribution Retirement Plan Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	$ 772	$ 984	$ 1,543	$ 1,968
Interest cost on projected benefit obligation	6,006	5,954	12,013	11,907
Expected return on plan assets	(8,070)	(8,083)	(16,139)	(16,165)
Net amortization and deferrals	1,385	5,203	2,772	10,406
Total postretirement benefit (income) expense	93	4,058	189	8,116
Total expense	2,304	6,151	4,801	12,344
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	3,863	4,102	7,638	8,485
Interest cost on projected benefit obligation	6,372	6,151	12,737	12,543
Expected return on plan assets	(11,985)	(12,440)	(23,934)	(25,390)
Net amortization and deferrals	3,286	3,314	6,550	6,801
Total postretirement benefit (income) expense	1,536	1,127	2,991	2,439
Total expense	3,299	2,820	6,461	5,727
United States Postretirement Benefit Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution and other retirement plans	2,211	2,093	4,612	4,228
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution and other retirement plans	$ 1,763	$ 1,693	$ 3,470	$ 3,288