Goodwill and Intangible Assets - Schedule of Goodwill and Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Intangible Assets By Major Class [Line Items]
Goodwill	$ 93,842	$ 93,842
Amortization of intangible assets	(3,013)	(2,762)
Total intangible assets	1,997	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