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Long-term Debt - Additional Information (Detail) (USD $)	9 Months Ended		1 Months Ended	9 Months Ended		1 Months Ended
	Sep. 29, 2013 Note Payable [Member]	Sep. 23, 2012 Note Payable [Member]	Sep. 21, 2012 JPMorgan Chase Bank, N.A. [Member] Senior credit facility [Member]	Sep. 29, 2013 JPMorgan Chase Bank, N.A. [Member] Senior credit facility [Member]	Dec. 30, 2012 JPMorgan Chase Bank, N.A. [Member] Senior credit facility [Member]	Oct. 24, 2013 Subsequent Event [Member]
Debt Instrument [Line Items]
Public offering proceeds used for repayments of debt						$ 14,000,000
Revolving credit facility agreement term period			5 years
Revolving credit facility agreement expiration date				Sep. 30, 2017
Borrowings allowed to fund capital expenditures			35,000,000
Maximum leverage ratio			2.25
Minimum debt service coverage ratio			1.5
Federal funds effective rate plus				0.50%
Federal funds base rate				The base rate is the higher of the prime rate and the federal funds rate, plus 0.50%.
Weighted average interest rate				1.35%	1.35%
Interest rate on notes payable under effective interest rate method	6.00%	6.00%
Interest expense on note payable	$ 54,000	$ 57,000

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Interest Expense On Notes Payable

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Minimum Debt Service Coverage Ratio

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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-Topic 210

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-02.22(a)(1))

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average interest rate of debt outstanding.

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Date the credit facility terminates, in CCYY-MM-DD format.

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-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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