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Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2019
USD ($)
Segment
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Jan. 01, 2019
USD ($)
Jan. 01, 2017
USD ($)
Significant Accounting Policies [Line Items]          
Number of operating segments | Segment 1        
Goodwill impairment losses $ 0 $ 0 $ 0    
Deferred revenue 1,386,700,000 1,338,000,000.0      
Revenue expected to be recognized from remaining performance obligations 1,560,300 1,557,600      
Revenue expected to be recognized from remaining performance obligations, 2019 1,087,300        
Provision for estimated sales returns, rebates, stock rotations, and other customer rights $ 4,600,000 8,500,000      
Maximum percentage of annual compensation contributed by employees towards employee benefit plan 50.00%        
Maximum amount contributed by employees toward employee benefit plan $ 19,000        
Additional amount contributed by employees aged 50 and over towards employee benefit plan $ 6,000        
Percentage of employee contributions contributed by employer towards employee benefit plan 50.00%        
Maximum percentage of employee's eligible compensation 6.00%        
Contributions by employer $ 4,100,000 4,200,000 3,600,000    
Minimum percentage of tax benefit realized upon settlement 50.00%        
Advertising expenses $ 5,200,000 3,100,000 $ 1,800,000    
Allowance for doubtful accounts $ 800,000 $ 1,000,000.0      
Anti-dilutive shares excluded from computation of earnings per share amount | shares 4,900,000 3,200,000 1,600,000    
Operating lease ROU assets $ 28,900,000        
Lease liabilities   $ 29,200,000      
Rent expenses 11,100,000 8,200,000 $ 11,100,000    
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 20,200,000 22,600,000      
Amortisation of contracted capitalised costs 13,100,000 11,200,000      
Accounting Standards Update 2016-02          
Significant Accounting Policies [Line Items]          
Operating lease ROU assets       $ 27,700,000  
Lease liabilities       $ 27,700,000  
Accounting Standards Update 2016-09 | Retained earnings | Forfeitures          
Significant Accounting Policies [Line Items]          
Cumulative-effect net of tax adjustment to increase (decrease) retained earnings         $ 2,100,000
Accounting Standards Update 2016-09 | Retained earnings | Income Tax Accounting          
Significant Accounting Policies [Line Items]          
Cumulative-effect net of tax adjustment to increase (decrease) retained earnings         $ 86,100,000
Security Subscriptions and Software Updates and Maintenance          
Significant Accounting Policies [Line Items]          
Deferred revenue 1,069,900,000 878,500      
Foreign Exchange Forward Contracts | Not Designated as Hedging Instrument          
Significant Accounting Policies [Line Items]          
Derivative, notional amount 342,300,000 337,500,000      
Foreign Exchange Forward Contracts | Designated as Hedging Instrument | Cash Flow Hedging          
Significant Accounting Policies [Line Items]          
Derivative, notional amount 38,200,000 112,100,000      
Foreign Exchange Forward Contracts | Financial Income | Not Designated as Hedging Instrument          
Significant Accounting Policies [Line Items]          
Derivative, net gain (loss) 16,700,000 (33,300,000) 25,100,000    
Foreign Exchange Forward Contracts | Operating Expenses | Designated as Hedging Instrument | Cash Flow Hedging          
Significant Accounting Policies [Line Items]          
Derivative, net gain (loss) $ 1,300,000 $ (4,600,000) $ 4,700,000    
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