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           Intangible Assets - Summary of Amortization Expense for Acquired Intangibles (Detail) (USD $) 
        In Thousands, unless otherwise specified  | 
        3 Months Ended | 9 Months Ended | ||
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           Sep. 28, 2013 
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           Sep. 29, 2012 
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           Sep. 28, 2013 
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           Sep. 29, 2012 
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| Goodwill And Intangible Assets Disclosure [Abstract] | ||||
| Amortization Expense | $ 1,494 | $ 1,013 | $ 2,429 | $ 1,667 | 
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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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- Details 
          
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