Goodwill and Other Intangibles - Components of Identifiable Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 10,915	$ 10,899
Accumulated Amortization	5,157	4,755
Net Carrying Value of Intangible Assets	5,758	6,144
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	5,691	5,679
Accumulated Amortization	2,094	1,932
Net Carrying Value of Intangible Assets	3,597	3,747
Trademarks and Technology Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1,416	1,414
Accumulated Amortization	970	935
Net Carrying Value of Intangible Assets	446	479
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2,837	2,835
Accumulated Amortization	1,581	1,441
Net Carrying Value of Intangible Assets	1,256	1,394
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	971	971
Accumulated Amortization	512	447
Net Carrying Value of Intangible Assets	$ 459	$ 524