Purchase of Beall Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended
	Feb. 28, 2013
Acquired Finite and Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible assets preliminarily, Amount	$ 8,860
Tradenames and Trademarks
Acquired Finite and Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible assets preliminarily, Amount	1,622
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	20 years
Technology
Acquired Finite and Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible assets preliminarily, Amount	1,217
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	8 years
Customer relationships
Acquired Finite and Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible assets preliminarily, Amount	$ 6,021
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	8 years