Acquired Intangible Assets - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified				9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013		Sep. 30, 2014 Minimum [Member]	Sep. 30, 2014 Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life				7 years	10 years
Acquired intangible assets	$ 9,751	$ 0	[1]

[1] The Condensed Consolidated Balance Sheet as of December 31, 2013 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.