Stock-Based Compensation - Summary of Stock Option Activity (Detail) (USD $)	6 Months Ended
Jun. 28, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Beginning Balance, Shares	141,500
Exercised, Shares	(34,000)
Ending Balance, Shares	107,500
Options exercisable, Shares	97,500
Beginning Balance, Weighted Average Price	$ 7.13
Exercised, Weighted Average Price	$ 7.66
Ending Balance, Weighted Average Price	$ 6.96
Options exercisable, Weighted Average Price	$ 6.41
Ending Balance, Weighted Average Remaining Term (In years)	3 years
Options exercisable, Weighted Average Remaining Term (In years)	2 years 8 months 12 days
Ending Balance, Aggregate Intrinsic Value	$ 4,599,595
Options exercisable, Aggregate Intrinsic Value	$ 4,225,995

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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- Definition

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.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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

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