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           Acquisitions - Amounts Allocated to Purchased Intangible Assets (Detail) (Peco, Inc [Member], USD $) 
        In Thousands, unless otherwise specified  | 
        9 Months Ended | 
|---|---|
| 
           Sep. 28, 2013 
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      |
| Acquired Finite-Lived Intangible Assets [Line Items] | |
| Acquisition Fair Value | $ 69,000 | 
| 
           Trade Names [Member] 
         | 
        |
| Acquired Finite-Lived Intangible Assets [Line Items] | |
| Weighted Average Life | 10 years | 
| Acquisition Fair Value | 4,200 | 
| 
           Technology [Member] 
         | 
        |
| Acquired Finite-Lived Intangible Assets [Line Items] | |
| Weighted Average Life | 10 years | 
| Acquisition Fair Value | 3,300 | 
| 
           Backlog and Customer Relationships [Member] 
         | 
        |
| Acquired Finite-Lived Intangible Assets [Line Items] | |
| Acquisition Fair Value | $ 61,500 | 
| 
           Backlog and Customer Relationships [Member] | Minimum [Member] 
         | 
        |
| Acquired Finite-Lived Intangible Assets [Line Items] | |
| Weighted Average Life | 1 year 6 months | 
| 
           Backlog and Customer Relationships [Member] | Maximum [Member] 
         | 
        |
| Acquired Finite-Lived Intangible Assets [Line Items] | |
| Weighted Average Life | 17 years | 
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- Definition 
          The aggregate expected value at the end of their useful life of a major finite-lived intangible asset class acquired during the period either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Details 
          
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- Definition 
          Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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