| 
           Acquisitions - Additional Information (Detail) 
         | 
        9 Months Ended | 1 Months Ended | 1 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 
           Sep. 28, 2013
 
          USD ($) 
         | 
        
           Sep. 29, 2012
 
          USD ($) 
         | 
        
           Dec. 31, 2012
 
          USD ($) 
         | 
        
           Jul. 30, 2012 
         | 
        
           May 28, 2013
 
          Peco, Inc. [Member]
 
          USD ($) 
         | 
        
           Jul. 30, 2012
 
          Max-Viz, Inc. [Member]
 
          USD ($) 
         | 
        
           Oct. 01, 2013
 
          AeroSat, Inc [Member]
 
          Subsequent Event [Member]
 
          USD ($) 
         | 
        
           Oct. 01, 2013
 
          AeroSat, Inc [Member]
 
          Subsequent Event [Member]
 
          Maximum [Member]
 
          USD ($) 
         | 
        
           Oct. 01, 2013
 
          AeroSat, Inc [Member]
 
          Subsequent Event [Member]
 
          Minimum [Member]
 
          USD ($) 
         | 
        
           Nov. 04, 2013
 
          PGA Electronic, SA [Member]
 
          Subsequent Event [Member]
 
          USD ($) 
         | 
        
           Nov. 04, 2013
 
          PGA Electronic, SA [Member]
 
          Subsequent Event [Member]
 
          EUR (€) 
         | 
      |
| Loans At Acquisition Date [Line Items] | |||||||||||
| Percentage of acquired stock | 100.00% | 100.00% | |||||||||
| Purchase consideration in cash | $ 136,000,000 | $ 10,700,000 | |||||||||
| Acquisition contingent consideration | 135,898,000 | 10,619,000 | 8,000,000 | ||||||||
| Target period of growth | 3 years | ||||||||||
| Revenue through acquisition | 5,400,000 | ||||||||||
| Goodwill and purchased intangible assets deductible for tax purposes period | 15 years | ||||||||||
| Outstanding capital stock | 12,000,000 | 28,000,000 | 21,400,000 | ||||||||
| Maximum earn out contingent consideration | 755,000 | 814,000 | 53,000,000 | ||||||||
| Earn out begins to be payable under sales condition one | 30,000,000 | ||||||||||
| Earn out begins to be payable under sales condition two | $ 40,000,000 | ||||||||||
| Contingent consideration percentage | 15.00% | ||||||||||
| Percentage value of acquisition paid in cash | 60.00% | 60.00% | |||||||||
| Percentage value of acquisition paid in common stock | 40.00% | 40.00% | |||||||||