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Business Segment, Geographic Area, Product and Significant Customer Information - Customers with Net Revenues Greater than 10% of Total Net Revenues (Detail) - Customer Concentration Risk [Member] - Sales Revenue, Net [Member]
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Customer A [Member]        
Revenue, Major Customer [Line Items]        
Percentage of total net revenues 18.10% 18.90% 17.80% 19.60%
Customer B [Member]        
Revenue, Major Customer [Line Items]        
Percentage of total net revenues 13.20% 13.80% 12.70% 13.40%