Reconciliation of Basic and Diluted Per Share Data (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
Basic
Net income (loss)	$ 463	$ (3,190)	$ 1,667	$ 656
Weighted average shares outstanding	19,117	18,991	19,152	18,943
Basic earnings (loss) per common share	$ 0.02	$ (0.17)	$ 0.09	$ 0.03
Diluted
Net income (loss)	$ 463	$ (3,190)	$ 1,667	$ 656
Weighted average shares outstanding	19,117	18,991	19,152	18,943
Effect of dilutive securities
Weighted average common shares and potential dilutive shares	19,195	18,991	19,301	19,129
Diluted earnings (loss) per common share	$ 0.02	$ (0.17)	$ 0.09	$ 0.03
Stock options
Effect of dilutive securities
Effect of dilutive securities				2
Restricted stock
Effect of dilutive securities
Effect of dilutive securities	78		149	184