Goodwill and Intangible Assets - Schedule of Goodwill and Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Intangible Assets By Major Class [Line Items]
Goodwill	$ 93,842	$ 93,842
Amortization of intangible assets	(2,887)	(2,762)
Total intangible assets	2,123	2,248
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