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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		6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017
Earnings Per Share Basic [Line Items]
Net (loss) income	$ (248)	$ 2,778	$ (1,557)	$ 8,104
Weighted-average shares of common stock outstanding:
Basic	20,985	21,746	20,964	21,715
Dilutive effect of common stock equivalents arising from share option, nonvested share and nonvested share unit awards		125		208
Diluted	20,985	21,871	20,964	21,923
Basic earnings per share	$ (0.01)	$ 0.13	$ (0.07)	$ 0.37
Diluted earnings per share	$ (0.01)	$ 0.13	$ (0.07)	$ 0.37
Share Option Awards [Member]
Weighted-average shares of common stock outstanding:
Antidilutive shares/unit awards excluded from diluted calculation	110	71	261	84
Nonvested Share Awards and Nonvested Share Unit Awards [Member]
Weighted-average shares of common stock outstanding:
Antidilutive shares/unit awards excluded from diluted calculation	301	3	280

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- Definition

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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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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