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Major Customers Data as Percentage of Total Revenues (Detail) - Revenue - Customer Concentration Risk
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Customer A        
Revenue, Major Customer [Line Items]        
Percentage of total revenues 23.00% 29.00% 24.00% 26.00%
Customer B        
Revenue, Major Customer [Line Items]        
Percentage of total revenues 16.00% 20.00% 17.00% 18.00%
Customer C        
Revenue, Major Customer [Line Items]        
Percentage of total revenues 12.00% 10.00% 0.00% [1] 0.00% [1]
[1] *) Less than 10%