Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Net income	$ 2,120	$ 1,932	$ 6,100	$ 6,022
Weighted average common basic shares	40,995	40,942	40,981	40,925
Effect of dilutive securities	302	219	304	23
Weighted average common dilutive shares	41,297	41,161	41,285	40,948
Basic and diluted net income per share	$ 0.05	$ 0.05	$ 0.15	$ 0.15