Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	$ 437,333	$ 433,352
Accumulated depreciation and amortization	(224,374)	(218,372)
Property, plant and equipment, net	212,959	214,980
Land and Land Improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	12,140	12,172
Buildings [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	68,845	68,572
Machinery and Equipment [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	343,236	340,396
Construction-in-Process [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	5,908	5,019
Other [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	$ 7,204	$ 7,193