Net Income (Loss) Per Share - Computation of Basic and Diluted Net Income (Loss) Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]
Net income (loss)	$ 1,932	$ 3,279	$ 6,022	$ (9,136)
Weighted average common basic shares	40,942	40,873	40,925	40,856
Effect of dilutive securities	219	70	23
Weighted average common dilutive shares	41,161	40,943	40,948	40,856
Basic and diluted net income (loss) per share	$ 0.05	$ 0.08	$ 0.15	$ (0.22)