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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								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Numerator
Net income	$ 702	$ 6,278	$ 4,156	$ 1,518	$ 5,100	$ 4,742	$ 2,755	$ 2,658	$ 12,654	$ 15,255	$ 6,675
Determination of shares (in thousands)
Weighted-average common shares outstanding									5,102	5,166	5,350
Dilutive effect - share-based awards									31	12	16
Diluted weighted-average common shares outstanding									5,133	5,178	5,366
Earnings per common share
Basic	$ 0.14	$ 1.23	$ 0.81	$ 0.30	$ 1.00	$ 0.92	$ 0.53	$ 0.51	$ 2.48	$ 2.95	$ 1.25
Diluted	$ 0.14	$ 1.23	$ 0.81	$ 0.30	$ 0.99	$ 0.92	$ 0.53	$ 0.51	$ 2.47	$ 2.95	$ 1.24

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Determination of shares.

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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