Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	$ 417,166	$ 409,486
Accumulated depreciation and amortization	(256,576)	(243,094)
Property, plant and equipment, net	160,590	166,392
Land and Land Improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	9,757	9,556
Buildings [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	62,455	61,866
Machinery and Equipment [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	331,766	325,941
Construction-in-Process [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	6,387	5,251
Other [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	$ 6,801	$ 6,872