Summary of Significant Accounting Policies - Weighted Average Number of Shares Outstanding Used to Compute Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Apr. 04, 2015	Mar. 29, 2014
Accounting Policies [Abstract]
Net (loss) earnings	$ (1,973)us-gaap_NetIncomeLoss	$ 5,159us-gaap_NetIncomeLoss
Weighted-average number of common shares outstanding
Basic weighted-average common shares outstanding	10,964	10,844
Dilutive potential common shares	0	263
Diluted weighted-average common shares outstanding	10,964	11,107
(Loss) earnings per share
Basic (in dollars per share)	$ (0.18)us-gaap_EarningsPerShareBasic	$ 0.48us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ (0.18)us-gaap_EarningsPerShareDiluted	$ 0.46us-gaap_EarningsPerShareDiluted

Summary of Significant Accounting Policies - Weighted Average Number of Shares Outstanding Used to Compute Earnings Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified

3 Months Ended

Apr. 04, 2015

Mar. 29, 2014

Accounting Policies [Abstract]

Net (loss) earnings

$ (1,973)us-gaap_NetIncomeLoss

$ 5,159us-gaap_NetIncomeLoss

Weighted-average number of common shares outstanding

Basic weighted-average common shares outstanding

10,964us-gaap_WeightedAverageNumberOfSharesOutstandingBasic

10,844us-gaap_WeightedAverageNumberOfSharesOutstandingBasic

Dilutive potential common shares

0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment

263us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment

Diluted weighted-average common shares outstanding

10,964us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

11,107us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

(Loss) earnings per share

Basic (in dollars per share)

$ (0.18)us-gaap_EarningsPerShareBasic

$ 0.48us-gaap_EarningsPerShareBasic

Diluted (in dollars per share)

$ (0.18)us-gaap_EarningsPerShareDiluted

$ 0.46us-gaap_EarningsPerShareDiluted

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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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