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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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Customer A [Member]        
Revenue, Major Customer [Line Items]        
Percentage of total net revenues 18.00% 20.00% 18.00% 20.00%
Customer B [Member]        
Revenue, Major Customer [Line Items]        
Percentage of total net revenues 16.00% 11.00% 14.00% 13.00%