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Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Jan. 01, 2018
USD ($)
Dec. 31, 2018
USD ($)
Segment
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
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   1,337,954,000 1,186,573,000      
Revenue expected to be recognized from remaining performance obligations   1,557,552,000        
Revenue expected to be recognized from remaining performance obligations, 2019   1,069,938,000        
Provision for estimated sales returns, rebates, stock rotations, and other customer rights   8,491,000 8,978,000      
Severance expenses   $ 11,267,000 10,180,000 8,165,000    
Maximum percentage of annual compensation contributed by employees towards employee benefit plan   50.00%        
Maximum amount contributed by employees toward employee benefit plan   $ 18,500        
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   $ 4,163,000 3,613,000 2,290,000    
Minimum percentage of tax benefit realized upon settlement   50.00%        
Advertising expenses   $ 3,106,000 1,764,000 3,127,000    
Allowance for doubtful accounts   1,033,000 1,911,000      
Bad debt expense (income)   (878,000) (344,000) 154,000    
Write off of bad debts   $ 627,000 $ 29,000 $ 0    
Anti-dilutive shares excluded from computation of earnings per share amount | shares   3,235,080 1,640,329 4,232,063    
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   22,623,000        
Accounting Standards Update 2016-16            
Significant Accounting Policies [Line Items]            
Cumulative effect on retained earnings $ (442,000)          
Accounting Standards Update 2016-09 | Retained earnings | Forfeitures            
Significant Accounting Policies [Line Items]            
Cumulative-effect net of tax adjustment to increase (decrease) retained earnings           $ (2,149,000)
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           $ 86,132,000
Security Subscriptions and Software Updates and Maintenance            
Significant Accounting Policies [Line Items]            
Deferred revenue   878,538,000        
Subsequent Event | Accounting Standards Update 2016-02            
Significant Accounting Policies [Line Items]            
Right-of-use leased assets         $ 27,000,000  
Lease liabilities         $ 27,000,000  
Foreign Exchange Forward Contracts | Not Designated as Hedging Instrument            
Significant Accounting Policies [Line Items]            
Derivative, notional amount   337,498,000 338,053,000      
Gains (losses) from derivatives not designated as hedge   45,000 107,000      
Foreign Exchange Forward Contracts | Designated as Hedging Instrument | Cash Flow Hedging            
Significant Accounting Policies [Line Items]            
Derivative, notional amount   112,053,000 7,354,000      
Other comprehensive income, gain (loss) on outstanding forward contracts   (801,000) 267,000      
Foreign Exchange Forward Contracts | Financial Income | Not Designated as Hedging Instrument            
Significant Accounting Policies [Line Items]            
Derivative, net gain (loss)   (33,330,000) 25,086,000 $ 1,822,000    
Foreign Exchange Forward Contracts | Operating Expenses | Designated as Hedging Instrument | Cash Flow Hedging            
Significant Accounting Policies [Line Items]            
Derivative, net gain (loss)   $ (4,637,000) $ 4,655,000 $ 120,000    
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