Net Income Per Share - Summary of Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net income (loss)	$ 4,630	$ (3,840)	$ 17,584	$ 6,599
Weighted average shares outstanding	26,839	17,979	20,122	17,749
Effective of dilutive stock options	328		345	371
Diluted shares outstanding	27,167	17,979	20,467	18,120
Basic net income (loss) per share	$ 0.17	$ (0.21)	$ 0.87	$ 0.36
Diluted net income (loss) per share	$ 0.17	$ (0.21)	$ 0.86	$ 0.36