Goodwill and Intangible Assets - Goodwill and Intangible Assets (Parenthetical) (Detail) (USD $)	1 Months Ended	12 Months Ended
	Feb. 27, 2012	Dec. 31, 2012
Customer Relationships [Member]
Other Intangibles [Line Items]
Purchase price allocated to other intangible assets	$ 168,000	$ 168,000
Estimated useful lives of intangible assets acquired	5 years	5 years
Patents [Member]
Other Intangibles [Line Items]
Estimated useful lives of intangible assets acquired		20 years