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Taxes On Income - Additional Information (Detail) - USD ($)
 12 Months Ended
Jan. 01, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2013
Dec. 31, 2010
Dec. 31, 2014
Operating Loss Carryforwards [Line Items]                
Corporate tax rate     24.00% 25.00% 26.50%      
Minimum obligation to invest during five years period               $ 111,000,000
Corporate tax rate     24.00% 25.00% 26.50%      
Estimated tax benefit related to re-measurement of deferred tax balance     $ 41,084,000          
Undistributed earnings of foreign subsidiaries     346,675,000          
Unrecognized deferred tax liability on undistributed earnings of foreign subsidiaries     56,706,000          
Unrecognized tax benefit liability adjusted within 12 months     58,198,000          
Uncertain tax positions interest expense     4,168,000 $ 6,025,000 $ 7,534,000      
Uncertain tax positions accrued interest     25,219,000 21,051,000        
Penalties accrued     $ 0 $ 0        
Subsequent Event                
Operating Loss Carryforwards [Line Items]                
Reduction of corporate tax rate 23.00%              
Maximum                
Operating Loss Carryforwards [Line Items]                
Dividend income tax rate           20.00%    
Minimum                
Operating Loss Carryforwards [Line Items]                
Dividend income tax rate           15.00%    
U.S.                
Operating Loss Carryforwards [Line Items]                
Corporate tax rate     35.00%          
U.S. | Scenario, Plan                
Operating Loss Carryforwards [Line Items]                
Corporate tax rate   21.00%            
U S Federal                
Operating Loss Carryforwards [Line Items]                
U.S. loss carry forward     $ 452,795,000          
Operating loss carry forward expiration years     2020          
U S State                
Operating Loss Carryforwards [Line Items]                
U.S. loss carry forward     $ 118,476,000          
U S State | Maximum                
Operating Loss Carryforwards [Line Items]                
Operating loss carry forward expiration years     2024          
U S State | Minimum                
Operating Loss Carryforwards [Line Items]                
Operating loss carry forward expiration years     2018          
Research And Development Tax Credit                
Operating Loss Carryforwards [Line Items]                
U.S. loss carry forward     $ 19,250,000          
Research And Development Tax Credit | Maximum                
Operating Loss Carryforwards [Line Items]                
Operating loss carry forward expiration years     2037          
Research And Development Tax Credit | Minimum                
Operating Loss Carryforwards [Line Items]                
Operating loss carry forward expiration years     2019          
Tax Year 2012                
Operating Loss Carryforwards [Line Items]                
Enacted effective income tax rate             16.00%  
Technological Preferred Enterprise                
Operating Loss Carryforwards [Line Items]                
Enacted effective income tax rate     12.00%