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Major Customers Data as Percentage of Total Revenues (Detail) - Revenue - Customer Concentration Risk
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Customer A      
Revenue, Major Customer [Line Items]      
Percentage of total revenues 31.00% 25.00% 28.00%
Customer B      
Revenue, Major Customer [Line Items]      
Percentage of total revenues [1] [1] 11.00%
[1] *) Less than 10%