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Computation of Earnings Per Share - Calculation of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Numerator
Net income	$ 5,100	$ 4,742	$ 2,755	$ 2,658	$ 3,045	$ 206	$ 3,680	$ (256)	$ 15,255	$ 6,675	$ 12,861
Determination of shares (in thousands)
Weighted-average common shares outstanding									5,166	5,350	5,377
Dilutive effect - share-based awards									12	16	5
Diluted weighted-average common shares outstanding									5,178	5,366	5,382
Earnings per common share
Basic	$ 1.00	$ 0.92	$ 0.53	$ 0.51	$ 0.58	$ 0.04	$ 0.68	$ (0.05)	$ 2.95	$ 1.25	$ 2.39
Diluted	$ 0.99	$ 0.92	$ 0.53	$ 0.51	$ 0.58	$ 0.04	$ 0.68	$ (0.05)	$ 2.95	$ 1.24	$ 2.39

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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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