Goodwill and Intangible Assets - Schedule of Goodwill and Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Intangible Assets By Major Class [Line Items]
Goodwill	$ 93,842	$ 93,842
Amortization of intangible assets	(2,636)	(2,259)
Total intangible assets	2,374	2,751
Intellectual Property [Member]
Intangible Assets By Major Class [Line Items]
Intangible assets	5,000	5,000
Trade Names [Member]
Intangible Assets By Major Class [Line Items]
Intangible assets	$ 10	$ 10