Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	$ 435,155	$ 433,352
Accumulated depreciation and amortization	(228,165)	(218,372)
Property, plant and equipment, net	206,990	214,980
Land and Land Improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	11,887	12,172
Buildings [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	67,783	68,572
Machinery and Equipment [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	340,650	340,396
Construction-in-Process [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	7,456	5,019
Other [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	$ 7,379	$ 7,193