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		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Net income (loss)	$ 2,066	$ (4,208)	$ 4,090	$ (12,415)
Weighted average common basic shares	40,921	40,852	40,915	40,847
Effect of dilutive securities	27		27
Weighted average common dilutive shares	40,948	40,852	40,942	40,847
Basic and diluted net income (loss) per share	$ 0.05	$ (0.10)	$ 0.10	$ (0.30)