Acquired Intangible Assets - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Minimum [Member]	Mar. 31, 2014 Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets are amortized over their estimated useful lives			7 years	10 years
Acquired intangible assets	$ 10,465	$ 0