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Treasury Stock - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2017	Jul. 01, 2016	Oct. 19, 2016	Oct. 21, 2015
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount			$ 35,000,000	$ 35,000,000
Purchase of treasury shares (in shares)	117,582	90,505
Repurchase of treasury shares	$ 7,004,000	$ 4,458,000
Remaining authorized amount for repurchase of common stock	50,303,000
Treasury stock reissued at lower than repurchase price	$ 5,667,000	$ 5,791,000

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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- Definition

In cases when treasury stock is reissued at a price lower than the cost to repurchase, the excess difference between the selling price and cost to repurchase is charged against retained earnings (assuming that all APIC arising from treasury stock transactions has first been exhausted).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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