Goodwill and Intangible Assets - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Finite Lived Intangible Assets [Line Items]
Goodwill in result of business acquisition	$ 19,898		$ 11,527	[1]
Amortization of intangible assets	646	0
SocialMoov [Member]
Finite Lived Intangible Assets [Line Items]
Goodwill in result of business acquisition	$ 19,898

[1] Derived from our audited consolidated financial statements as of December 31, 2014.