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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		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Numerator
Net income	$ 3,680	$ 5,080	$ 3,424	$ 7,818
Determination of shares
Weighted-average common shares outstanding	5,392	5,389	5,394	5,390
Dilutive effect - share-based awards	1	4	2	40
Diluted weighted-average common shares outstanding	5,393	5,393	5,396	5,430
Earnings per common share
Basic	$ 0.68	$ 0.94	$ 0.63	$ 1.45
Diluted	$ 0.68	$ 0.94	$ 0.63	$ 1.44

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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