Computations of Basic and Diluted Earnings Per Common Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 29, 2015	Mar. 30, 2014
Earnings Per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	200,000	300,000
Net income	$ 2,533us-gaap_NetIncomeLoss	$ 2,877us-gaap_NetIncomeLoss
Weighted average common shares outstanding	15,122,000	19,314,000
Effect of dilutive securities:
Stock options	745,000	804,000
Restricted stock	3,000	47,000
Weighted average common and potentially issuable common shares outstanding—diluted	15,870,000	20,165,000
Basic net income per common share	$ 0.17us-gaap_EarningsPerShareBasic	$ 0.15us-gaap_EarningsPerShareBasic
Diluted net income per common share	$ 0.16us-gaap_EarningsPerShareDiluted	$ 0.14us-gaap_EarningsPerShareDiluted

Incremental common shares attributable to share-based payment restricted stock.

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Incremental common shares attributable to share-based payment stock options.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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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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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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