Property and Equipment, Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 253,468	$ 237,074
Less accumulated depreciation	143,216	135,484
Total	110,252	101,590
Depreciation expense	13,200	13,300	$ 15,700
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	15,662	15,662
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 57,024	49,870
Buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful life	5 years
Buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful life	40 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 146,175	137,555
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life	2 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life	20 years
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 21,127	21,749
Furniture and equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life	2 years
Furniture and equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life	10 years
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 13,480	$ 12,238