Other Income (Expense), Net - Components of Other Income Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other Income and Expenses [Abstract]
Foreign currency (loss) gain	$ (2,277)	$ (2,303)	$ (3,309)	$ (1,089)
Equity income	1,594	792	2,223	1,067
Expected return on pension assets/amortization	3,027	2,488	6,050	4,980
Other miscellaneous (income) expense	(173)	(41)	(207)	789
Total other income (expense), net	$ 2,171	$ 936	$ 4,757	$ 5,747