Segment Information (Additional Information) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Net sales	$ 397,969,000	$ 378,924,000	$ 383,588,000
Entity Wide Revenue Other Customers Percentage Description	No other customers accounted for more than 10.0% of total net sales in 2013, 2012, and 2011.
Ford Motor Company [Member]
Segment Reporting Information [Line Items]
Net sales	79,700,000	71,200,000	62,200,000
Entity-Wide Revenue, Major Customer, Percentage	20.00%	18.80%	16.20%
Chrysler Group Llc [Member]
Segment Reporting Information [Line Items]
Net sales	43,500,000	38,000,000
Entity-Wide Revenue, Major Customer, Percentage	10.90%	10.00%
Performance Materials Segment
Segment Reporting Information [Line Items]
Gain (Loss) on Sale of Business		800,000	1,600,000
Asset impairment charges		300,000
Corprates [Member]
Segment Reporting Information [Line Items]
Asset impairment charges		$ 1,500,000