Goodwill and Intangible Assets (Detail) - Intangible assets (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Intangible Assets, Gross	$ 7,745	$ 7,610
Less accumulated amortization	(3,376)	(2,611)
Intangible assets, Net	4,369	4,999
Trade Names [Member]
Finite-Lived Intangible Asset Useful Life	15 - 20
Intangible Assets, Gross	1,404	1,387
Patents [Member]
Finite-Lived Intangible Asset Useful Life	5 - 12
Intangible Assets, Gross	5,072	4,987
Customer Relationships [Member]
Finite-Lived Intangible Asset Useful Life	4 - 8
Intangible Assets, Gross	$ 1,269	$ 1,236