Earnings per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Numerator:
Net income (loss)	$ (1,062)	$ 2,218	$ (748)	$ 2,617
Denominator:
Common shares outstanding	17,626	18,112	18,059	18,155
Earnings per common share - basic
Net income (loss)	$ (0.06)	$ 0.12	$ (0.04)	$ 0.14
Denominator:
Common shares outstanding	17,626	18,112	18,059	18,155
Common stock option grants		9		12
Total shares	17,626	18,271	18,059	18,346
Earnings per common share - diluted
Net income (loss)	$ (0.06)	$ 0.12	$ (0.04)	$ 0.14
Restricted Stock [Member]
Denominator:
Shares subject to vesting		88		110
Performance Based Equity Awards [Member]
Denominator:
Shares subject to vesting		62		69