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Major Customers Data as Percentage of Total Revenues (Detail) (Revenue [Member], Customer Concentration Risk [Member])
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Customer A
   
Revenue, Major Customer [Line Items]    
Percentage of total revenues 16.00% 17.00%
Customer B
   
Revenue, Major Customer [Line Items]    
Percentage of total revenues 22.00%    [1]
Customer C
   
Revenue, Major Customer [Line Items]    
Percentage of total revenues 22.00%    [1]
Customer D
   
Revenue, Major Customer [Line Items]    
Percentage of total revenues    [1] 14.00%
Customer E
   
Revenue, Major Customer [Line Items]    
Percentage of total revenues    [1] 12.00%
[1] *) Less than 10%