Employee Benefits - Pension and Other Defined Contribution Retirement Plan Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	$ 698	$ 771
Interest cost on projected benefit obligation	4,560	6,007
Expected return on plan assets	(9,246)	(8,069)
Net amortization and deferrals	1,793	1,387
Total postretirement benefit income	(2,195)	96
Total expense	60	2,498
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	5,514	3,775
Interest cost on projected benefit obligation	3,848	6,366
Expected return on plan assets	(12,133)	(11,949)
Net amortization and deferrals	3,923	3,264
Total postretirement benefit income	1,152	1,456
Total expense	2,449	3,163
United States Postretirement Benefit Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution and other retirement plans	2,255	2,402
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution and other retirement plans	$ 1,297	$ 1,707