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Taxes On Income - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Loss Carryforwards [Line Items]      
Corporate tax rate 23.00%    
Undistributed earnings of foreign subsidiaries $ 421,200,000    
Unrecognized deferred tax liability on undistributed earnings of foreign subsidiaries 76,200,000    
Unrecognized tax benefit liability adjusted within 12 months 71,400,000    
Uncertain tax positions interest expense (600,000) $ 4,200,000 $ 5,500,000
Uncertain tax positions accrued interest 34,300,000 34,900,000  
Penalties accrued $ 0 $ 0  
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 Federal      
Operating Loss Carryforwards [Line Items]      
U.S. loss carry forward $ 331,300,000    
Operating loss carry forward expiration years 2021    
U S State      
Operating Loss Carryforwards [Line Items]      
U.S. loss carry forward $ 80,300,000    
U S State | Maximum      
Operating Loss Carryforwards [Line Items]      
Operating loss carry forward expiration years 2034    
U S State | Minimum      
Operating Loss Carryforwards [Line Items]      
Operating loss carry forward expiration years 2021    
Research And Development Tax Credit      
Operating Loss Carryforwards [Line Items]      
U.S. loss carry forward $ 23,400,000    
Research And Development Tax Credit | Maximum      
Operating Loss Carryforwards [Line Items]      
Operating loss carry forward expiration years 2040    
Research And Development Tax Credit | Minimum      
Operating Loss Carryforwards [Line Items]      
Operating loss carry forward expiration years 2021    
Technological Preferred Enterprise      
Operating Loss Carryforwards [Line Items]      
Enacted effective income tax rate 12.00%