Earnings per Share - Computation of Basic and Diluted Earnings 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
Numerator:
Net income (loss) from continuing operations	$ 187	$ 445	$ 2,139	$ (111)
Net loss from discontinued operations	(22)	(774)	(109)	(1,098)
Net income (loss)	$ 165	$ (329)	$ 2,030	$ (1,209)
Denominator:
Common shares outstanding	17,790	17,404	17,731	17,317
Earnings per common share - basic
Net income (loss) from continuing operations	$ 0.01	$ 0.03	$ 0.12	$ (0.01)
Net loss from discontinued operations	$ 0.00	$ (0.04)	$ (0.01)	$ (0.06)
Net income (loss)	$ 0.01	$ (0.02)	$ 0.11	$ (0.07)
Denominator:
Common shares outstanding	17,790	17,404	17,731	17,317
Restricted shares subject to vesting	213		170
Common stock option grants	72		72
Total shares	18,075	17,404	17,973	17,317
Earnings per common share - diluted
Net income (loss) from continuing operations	$ 0.01	$ 0.03	$ 0.12	$ (0.01)
Net loss from discontinued operations	$ 0.00	$ (0.04)	$ (0.01)	$ (0.06)
Net income (loss)	$ 0.01	$ (0.02)	$ 0.11	$ (0.07)