Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	$ 425,207	$ 409,486
Accumulated depreciation	(263,109)	(243,094)
Property, plant and equipment, net	162,098	166,392
Land and Land Improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	10,473	9,556
Buildings [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	63,765	61,866
Machinery and Equipment [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	339,203	325,941
Construction-in-Process [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	4,896	5,251
Other [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	$ 6,870	$ 6,872