Goodwill and Intangible Assets - Changes in the Carrying Amount of Goodwill in Total and for Each Reporting Unit (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Carrying value, beginning balance	$ 45,968
Goodwill impairment	0
Carrying value, ending balance	45,968
Intangible assets, net	4,819	5,011
Amortization of intangible assets	(192)
Intangible Assets, Net (Excluding Goodwill)	$ 4,819	$ 5,011