Computation of Diluted Earning Per Share with Exclusion of Antidilutive Securities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Numerator:
Net earnings (loss)	$ 1,097		$ 504		$ 158		$ (841)
Denominator:
Weighted average shares outstanding	4,700	[1]	4,605	[1]	4,662	[1]	4,582	[1]
Dilutive effect of stock options and non-vested restricted shares	75		66		70
Denominator for diluted net earnings (loss) per share	4,775		4,671		4,732		4,582

[1] Does not include unvested restricted shares.