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Taxes On Income - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2010
Operating Loss Carryforwards [Line Items]        
Corporate tax rate 26.50% 26.50% 25.00%  
Minimum obligation to invest during five years period   $ 111,000    
Undistributed earnings of foreign subsidiaries $ 178,636      
Unrecognized deferred tax liability on undistributed earnings of foreign subsidiaries 27,909      
Unrecognized tax benefit 893      
Uncertain tax positions interest expense 7,534 6,214 $ 20,857  
Uncertain tax positions accrued interest $ 17,413 $ 9,879    
Minimum        
Operating Loss Carryforwards [Line Items]        
Dividend income tax rate     15.00%  
Minimum | Israel        
Operating Loss Carryforwards [Line Items]        
Regular tax rate reduced 25.00%      
Maximum        
Operating Loss Carryforwards [Line Items]        
Dividend income tax rate     20.00%  
Maximum | Israel        
Operating Loss Carryforwards [Line Items]        
Regular tax rate reduced 26.50%      
U S Federal        
Operating Loss Carryforwards [Line Items]        
U.S. federal loss carry forward $ 531,643      
Operating loss carry forward expiration years 2018      
U S State        
Operating Loss Carryforwards [Line Items]        
U.S. federal loss carry forward $ 96,955      
U S State | Minimum        
Operating Loss Carryforwards [Line Items]        
Operating loss carry forward expiration years 2016      
U S State | Maximum        
Operating Loss Carryforwards [Line Items]        
Operating loss carry forward expiration years 2024      
Research And Development Tax Credit        
Operating Loss Carryforwards [Line Items]        
U.S. federal loss carry forward $ 15,924      
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 2034      
January 1, 2014 thereafter        
Operating Loss Carryforwards [Line Items]        
Enacted effective income tax rate       16.00%
Two Thousand Twelve        
Operating Loss Carryforwards [Line Items]        
Enacted effective income tax rate       12.50%
2013        
Operating Loss Carryforwards [Line Items]        
Enacted effective income tax rate       12.50%