Goodwill and Intangible Assets, Net - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Goodwill And Intangible Assets [Line Items]
Goodwill accumulated impairment losses	$ 0		$ 0		$ 0
In-process research and development or accumulated impairment losses	0		0		0
Amortization expense	$ 1,290,000	$ 709,000	$ 2,664,000	$ 2,143,000
Weighted Average
Goodwill And Intangible Assets [Line Items]
Weighted average useful life			10 years 3 months 9 days