| 
           Income Taxes - Additional Information (Detail) (USD $) 
        In Millions, unless otherwise specified  | 
        3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
| 
           Jun. 29, 2013 
         | 
        
           Jun. 30, 2012 
         | 
        
           Jun. 29, 2013 
         | 
        
           Jun. 30, 2012 
         | 
        
           Dec. 31, 2012 
         | 
      |
| Income Tax Disclosure [Abstract] | |||||
| Penalty or interest liability accrued | $ 0 | $ 0 | $ 0 | ||
| Penalty or interest expense | 0 | 0 | |||
| Effective tax rate | 33.20% | 30.80% | 26.10% | 31.60% | |
| Domestic tax credit related to 2012 | 1.1 | ||||
| Domestic tax credit related to 2013 | 0.4 | ||||
| Amount recognized in tax credit | $ 0.2 | ||||
| X | ||||||||||
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- Definition 
          Domestic tax credit related to current year recognized during period. No definition available. 
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| X | ||||||||||
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- Definition 
          Domestic tax credit related to previous year recognized during period. No definition available. 
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| X | ||||||||||
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- Definition 
          Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Details 
          
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| X | ||||||||||
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- Definition 
          The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition 
          The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition 
          Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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