| Intangible Assets, Net - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
| Sep. 27, 2014 | Sep. 28, 2013 | Sep. 27, 2014 | Sep. 28, 2013 | |
| Goodwill And Intangible Assets Disclosure Textual [Abstract] | ||||
| Amortization expense relating to intangibles assets | $ 106 | $ 86 | $ 316 | $ 299 | 
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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