Other Income (Expense), Net - Components of Other Income Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Income and Expenses [Abstract]
Foreign currency (loss)	$ (3,525)	$ (4,113)	$ (6,834)	$ (5,202)
Equity income	632	520	2,855	1,587
Expected return on pension assets/amortization	2,829	2,490	8,879	7,470
Other miscellaneous income	1,265	660	1,058	1,449
Total other income (expense), net	$ 1,201	$ (443)	$ 5,958	$ 5,304