Employee Benefits - Pension and Other Defined Contribution Retirement Plan Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	$ 984	$ 885	$ 1,968	$ 1,769
Interest cost on projected benefit obligation	5,954	6,232	11,907	12,463
Expected return on plan assets	(8,083)	(6,913)	(16,165)	(13,826)
Net amortization and deferrals	5,203	4,255	10,406	8,509
Total postretirement benefit expense	4,058	4,459	8,116	8,915
Total expense	6,151	6,250	12,344	12,817
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	4,102	4,002	8,485	7,950
Interest cost on projected benefit obligation	6,151	8,541	12,543	16,952
Expected return on plan assets	(12,440)	(12,675)	(25,390)	(25,155)
Net amortization and deferrals	3,314	3,000	6,801	5,954
Total postretirement benefit expense	1,127	2,868	2,439	5,701
Total expense	2,820	4,312	5,727	8,323
United States Postretirement Benefit Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution and other retirement plans	2,093	1,791	4,228	3,902
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution and other retirement plans	$ 1,693	$ 1,444	$ 3,288	$ 2,622