Share-Based Compensation - Stock Option Activity (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Apr. 04, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Beginning balance, Shares	1,221
Options awarded, Shares	599
Options exercised, Shares	(19)
Ending balance, Shares	1,801
Exercisable at April 4, 2015, Shares	391
Beginning balance, Weighted average exercise price	$ 7.77
Options awarded, Weighted average exercise price	$ 9.25
Options exercised, Weighted average exercise price	$ 6.58
Ending balance, Weighted average exercise price	$ 8.27
Exercisable at April 4, 2015, Weighted average exercise price	$ 6.12

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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Net number of share options (or share units) granted during the period.

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-Name Accounting Standards Codification

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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-Publisher FASB

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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No definition available.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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Number of share options (or share units) exercised during the current period.

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-Name Regulation S-X (SX)

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