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Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2017
USD ($)
Segment
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Jan. 01, 2017
USD ($)
Significant Accounting Policies [Line Items]        
Number of operating segments | Segment 1      
Goodwill impairment losses $ 0 $ 0 $ 0  
Provision for estimated sales returns, rebates, stock rotations, and other customer rights 8,978,000 16,104,000    
Severance expenses $ 10,180,000 8,165,000 7,140,000  
Maximum percentage of annual compensation contributed by employees towards employee benefit plan 50.00%      
Maximum amount contributed by employees toward employee benefit plan $ 18,000      
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 $ 3,613,000 2,290,000 1,397,000  
Minimum percentage of tax benefit realized upon settlement 50.00%      
Advertising expenses $ 1,764,000 3,127,000 2,311,000  
Allowance for doubtful accounts 1,911,000 2,255,000    
Bad debt expense (income) (344,000) 154,000 (1,834,000)  
Write off of bad debts $ 29,000 $ 0 $ 123,000  
Anti-dilutive shares excluded from computation of earnings per share amount | shares 1,640,329 4,232,063 1,594,082  
Manufacturing partner and supplier liabilities        
Significant Accounting Policies [Line Items]        
Significant costs associated with exposure $ 0 $ 0    
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
Foreign Exchange Forward Contracts | Not Designated as Hedging Instrument        
Significant Accounting Policies [Line Items]        
Derivative, notional amount 338,053,000 153,318,000    
Gains (losses) from derivatives not designated as hedge 107,000 10,000    
Foreign Exchange Forward Contracts | Designated as Hedging Instrument | Cash Flow Hedging        
Significant Accounting Policies [Line Items]        
Derivative, notional amount 7,354,000 51,970,000    
Other comprehensive income, gain (loss) on outstanding forward contracts 267,000 53,000    
Foreign Exchange Forward Contracts | Financial Income | Not Designated as Hedging Instrument        
Significant Accounting Policies [Line Items]        
Derivative, net gain (loss) 25,086,000 1,822,000 $ 378,000  
Foreign Exchange Forward Contracts | Operating Expenses | Designated as Hedging Instrument | Cash Flow Hedging        
Significant Accounting Policies [Line Items]        
Derivative, net gain (loss) $ 4,655,000 $ 120,000 $ (1,585,000)  
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