Earnings (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
Basic earnings (loss) per share:
Net income (loss)	$ 1,164	$ (2,275)	$ 5,175	$ (4,381)
Weighted-average common shares	33,880	5,056	28,686	5,042
Basic earnings (loss) per share	$ 0.03	$ (0.45)	$ 0.18	$ (0.87)
Diluted earnings (loss) per share:
Net income (loss)	$ 1,164	$ (2,275)	$ 5,175	$ (4,381)
Weighted-average common shares	33,880	5,056	28,686	5,042
Weighted-average shares from convertible preferred stock			3,535
Effect of dilutive securities	4,308		4,217
Weighted-average common shares and equivalents	38,188	5,056	36,438	5,042
Diluted earnings (loss) per share	$ 0.03	$ (0.45)	$ 0.14	$ (0.87)