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Computation of Earnings Per Share - Calculation 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	$ 206	$ 2,555	$ 3,630	$ 10,373
Determination of shares
Weighted-average common shares outstanding	5,356	5,372	5,381	5,384
Dilutive effect - share-based awards	16	4	16	5
Diluted weighted-average common shares outstanding	5,372	5,376	5,397	5,389
Earnings per common share
Basic	$ 0.04	$ 0.48	$ 0.67	$ 1.93
Diluted	$ 0.04	$ 0.48	$ 0.67	$ 1.92

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