Balance Sheet Information - Summary of Inventory (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 27, 2013	Dec. 28, 2012
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Raw materials	$ 41,031	$ 47,825
Work in process	14,109	9,994
Finished goods	2,098	2,349
Inventory, gross	57,238	60,168
Reserve for excess and obsolete	(6,945)	(6,203)
Total	$ 50,293	$ 53,965

Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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