Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net income	$ 315	$ 3,469	$ 801	$ 3,980
Weighted average common basic shares	41,020	40,978	41,018	40,974
Effect of dilutive securities	364	296	329	304
Weighted average common dilutive shares	41,384	41,274	41,347	41,278
Basic and diluted net income per share	$ 0.01	$ 0.08	$ 0.02	$ 0.10