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Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2020
USD ($)
Segment
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Jan. 01, 2019
USD ($)
Significant Accounting Policies [Line Items]        
Number of operating segments | Segment 1      
Goodwill impairment losses $ 0 $ 0 $ 0  
Deferred revenue 1,481,900,000 1,386,700,000    
Revenue expected to be recognized from remaining performance obligations 1,679.8 1,560.3    
Revenue expected to be recognized from remaining performance obligations, 2019 1,190.6      
Provision for estimated sales returns, rebates, stock rotations, and other customer rights $ 6,900,000 4,600,000    
Percentage of employee contributions contributed by employer towards employee benefit plan 50.00%      
Maximum percentage of employee's eligible compensation 6.00%      
Minimum percentage of tax benefit realized upon settlement 50.00%      
Advertising expenses $ 3,700,000 $ 5,200,000 $ 3,100,000  
Anti-dilutive shares excluded from computation of earnings per share amount | shares 6,200,000 4,900,000 3,200,000  
Trade receivables, net $ 540,800,000 $ 495,800,000    
Right of use assets 29,700,000     $ 27,700,000
Lease liabilities $ 30,700,000      
Operating Lease, Liability, Statement of Financial Position [Extensible List] Other Accrued Liabilities, Current      
Rent expenses $ 13,100,000 11,100,000 $ 8,200,000  
Manufacturing partner and supplier liabilities        
Significant Accounting Policies [Line Items]        
Significant costs associated with exposure 0 0    
Other Long Term Assets        
Significant Accounting Policies [Line Items]        
Deferred commission 18,100,000 20,200,000    
Amortisation of contracted capitalised costs 15,300,000 13,100,000 11,200,000  
Accounting Standards Update 2016-02        
Significant Accounting Policies [Line Items]        
Lease liabilities       $ 27,700,000
Security Subscriptions and Software Updates and Maintenance        
Significant Accounting Policies [Line Items]        
Deferred revenue 1,011,900,000 980,200    
Foreign Exchange Forward Contracts | Not Designated as Hedging Instrument        
Significant Accounting Policies [Line Items]        
Derivative, notional amount 396,200,000 342,300,000    
Foreign Exchange Forward Contracts | Designated as Hedging Instrument | Cash Flow Hedging        
Significant Accounting Policies [Line Items]        
Derivative, notional amount 37,700,000 38,200,000    
Foreign Exchange Forward Contracts | Financial Income | Not Designated as Hedging Instrument        
Significant Accounting Policies [Line Items]        
Derivative, net gain (loss) 24,800,000 16,700,000 (33,300,000)  
Foreign Exchange Forward Contracts | Operating Expenses | Designated as Hedging Instrument | Cash Flow Hedging        
Significant Accounting Policies [Line Items]        
Derivative, net gain (loss) $ 5,900,000 $ 1,300,000 $ (4,600,000)  
Minimum        
Significant Accounting Policies [Line Items]        
Estimated useful lives of intangible assets 8 years      
Maximum        
Significant Accounting Policies [Line Items]        
Estimated useful lives of intangible assets 20 years