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Earnings Per Share - Computation of Basic and Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Oct. 02, 2016	Sep. 27, 2015
Earnings Per Share [Abstract]
Net income	$ 8,187	$ 6,130	$ 9,192	$ 11,022
Weighted-average shares of common stock outstanding:
Basic	21,593	21,730	21,607	21,791
Dilutive effect of common stock equivalents arising from share option, nonvested share and nonvested share unit awards	139	120	183	186
Diluted	21,732	21,850	21,790	21,977
Basic earnings per share	$ 0.38	$ 0.28	$ 0.43	$ 0.51
Diluted earnings per share	$ 0.38	$ 0.28	$ 0.42	$ 0.50

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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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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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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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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