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Taxes On Income - Additional Information (Detail)
$ in Thousands, ₪ in Billions
 12 Months Ended
Jan. 01, 2018
Mar. 31, 2017
ILS (₪)
Jan. 01, 2017
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
Dec. 31, 2010
Operating Loss Carryforwards [Line Items]                
Corporate tax rate       25.00% 26.50% 26.50%    
Total revenues       $ 1,741,301 $ 1,629,838 $ 1,495,816    
Minimum obligation to invest during five years period           111,000    
Undistributed earnings of foreign subsidiaries       217,045        
Unrecognized deferred tax liability on undistributed earnings of foreign subsidiaries       37,282        
Unrecognized tax benefit liability adjusted within 12 months       43,661        
Uncertain tax positions interest expense       6,025 7,534 $ 6,214    
Uncertain tax positions accrued interest       21,051 $ 17,413      
Minimum                
Operating Loss Carryforwards [Line Items]                
Dividend income tax rate             15.00%  
Maximum                
Operating Loss Carryforwards [Line Items]                
Dividend income tax rate             20.00%  
Israel | Subsequent Event                
Operating Loss Carryforwards [Line Items]                
Reduction of corporate tax rate     24.00%          
Israel | Scenario, Forecast                
Operating Loss Carryforwards [Line Items]                
Reduction of corporate tax rate 23.00%              
U S Federal                
Operating Loss Carryforwards [Line Items]                
U.S. federal loss carry forward       $ 501,047        
Operating loss carry forward expiration years       2020        
U S State                
Operating Loss Carryforwards [Line Items]                
U.S. federal loss carry forward       $ 139,768        
U S State | Minimum                
Operating Loss Carryforwards [Line Items]                
Operating loss carry forward expiration years       2017        
U S State | Maximum                
Operating Loss Carryforwards [Line Items]                
Operating loss carry forward expiration years       2034        
Research And Development Tax Credit                
Operating Loss Carryforwards [Line Items]                
U.S. federal loss carry forward       $ 18,764        
Research And Development Tax Credit | Minimum                
Operating Loss Carryforwards [Line Items]                
Operating loss carry forward expiration years       2019        
Research And Development Tax Credit | Maximum                
Operating Loss Carryforwards [Line Items]                
Operating loss carry forward expiration years       2035        
January 1, 2014 thereafter                
Operating Loss Carryforwards [Line Items]                
Enacted effective income tax rate               16.00%
Technological Preferred Enterprise | Scenario, Forecast                
Operating Loss Carryforwards [Line Items]                
Enacted effective income tax rate   12.00%            
Technological Preferred Enterprise | Maximum | Scenario, Forecast                
Operating Loss Carryforwards [Line Items]                
Total revenues | ₪   ₪ 10