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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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Net income	$ 4,147	$ 4,630	$ 4,879	$ 17,584
Weighted average shares outstanding	27,159	26,839	26,973	20,122
Effect of dilutive stock options	163	328	130	345
Diluted shares outstanding	27,322	27,167	27,103	20,467
Basic net income per share	$ 0.15	$ 0.17	$ 0.18	$ 0.87
Diluted net income per share	$ 0.15	$ 0.17	$ 0.18	$ 0.86

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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