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Effective Income Tax Reconciliation (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Rate Reconciliation [Line Items]      
Income before taxes as reported in the statements of income $ 786,867 $ 683,214 $ 564,393
Statutory tax rate in Israel 25.00% 24.00% 25.00%
Effect of "Approved, Privileged or Preferred Enterprise" status (7.00%) [1] (6.00%) [1] (8.00%) [1]
Stock based compensation - nondeductible expense     1.00%
Others, net 3.00% 2.00% 2.00%
Effective tax rate 21.00% 20.00% 20.00%
[1] Basic earnings per share amounts of the benefit resulting from the " Approved, Privileged or Preferred Enterprise " status $ 0.20 $ 0.21 $ 0.24 Diluted earnings per share amounts of the benefit resulting from the " Approved, Privileged or Preferred Enterprise " status $ 0.20 $ 0.20 $ 0.23