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Business Segment, Geographic Area, Product and Significant Customer Information - Worldwide Net Revenue for Each Group of Products (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Revenue from External Customer [Line Items]        
Net sales from product groups $ 184,697 $ 156,928 $ 391,050 $ 298,573
Instruments, Control and Vacuum Products [Member]
       
Revenue from External Customer [Line Items]        
Net sales from product groups 90,250 84,880 191,907 159,604
Power and Reactive Gas Products [Member]
       
Revenue from External Customer [Line Items]        
Net sales from product groups 79,360 57,760 169,962 109,823
Analytical Solutions Group Products [Member]
       
Revenue from External Customer [Line Items]        
Net sales from product groups $ 15,087 $ 14,288 $ 29,181 $ 29,146