Goodwill and Intangible Assets (Changes in Carrying Amount of Goodwill by Reporting Unit) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Line Items]
Beginning Balance	$ 18,282	$ 18,059
Goodwill adjustment	110	140
Currency translation adjustments	197	83
Ending Balance	18,589	18,282
Performance Materials Segment
Goodwill [Line Items]
Beginning Balance	13,622	13,399
Goodwill adjustment	110	140
Currency translation adjustments	197	83
Ending Balance	13,929	13,622
Other Products and Services
Goodwill [Line Items]
Beginning Balance	4,660	4,660
Goodwill adjustment	0	0
Currency translation adjustments	0	0
Ending Balance	$ 4,660	$ 4,660