Computation of (Loss) Earnings Per Share - Basic and Diluted EPS (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Basic net income per share:
Net (loss) income	$ (5,767)	$ (4,361)	$ (14,187)	$ 6,251
Less: income allocated to participating securities				(16)
Net income allocated to common stockholders				6,235
Weighted average common shares outstanding — basic	34,480	33,975	34,340	33,774
Net income per share — basic	$ (0.17)	$ (0.13)	$ (0.41)	$ 0.18
Diluted net income per share:
Net (loss) income	(5,767)	(4,361)	(14,187)	6,251
Less: income allocated to participating securities				(16)
Net income allocated to common stockholders				$ 6,235
Weighted average common shares outstanding — basic	34,480	33,975	34,340	33,774
Dilutive securities				1,060
Weighted average common shares outstanding — diluted	34,480	33,975	34,340	34,834
Net income per share — diluted	$ (0.17)	$ (0.13)	$ (0.41)	$ 0.18