Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	$ 433,352	$ 411,538
Accumulated depreciation	(218,372)	(197,130)
Property, plant and equipment, net	214,980	214,408
Land and Land Improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	12,172	11,747
Buildings [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	68,572	66,017
Machinery and Equipment [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	340,396	323,684
Construction-in-Process [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	5,019	2,595
Other [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	$ 7,193	$ 7,495