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Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Significant Accounting Policies [Line Items]      
Net gain (impairment net of gains) on sale of marketable securities previously impaired $ 0 $ 2,017,000 $ (785,000)
Asset impairment charges 0 0 0
Goodwill impairment losses 0 0 0
Impairment of assets held for use 0 0 0
Provision for estimated sales returns, stock rotations, and other customer rights 10,330,000 10,117,000  
Severance expenses 5,113,000 4,823,000 4,053,000
Maximum percentage of annual compensation contributed by employees towards employee benefit plan 50.00%    
Maximum amount contributed by employees toward employee benefit plan 17,000    
Additional amount contributed by employees aged 50 and over towards employee benefit plan 5,500    
Percentage of employee contributions contributed by employer towards employee benefit plan 50.00%    
Maximum percentage of employee's eligible compensation 3.00%    
Contributions by employer 954,000 991,000 904,000
Minimum percentage of tax benefit realized upon settlement 50.00%    
Advertising expenses 3,239,000 2,918,000 3,098,000
Allowance for doubtful accounts 7,106,000 6,722,000  
Bad debt expense 855,000 702,000 97,000
Write off of bad debts 471,000 1,076,000 1,575,000
Notional amount of outstanding forward contract 100,865,000 34,676,000  
Net gains (losses) recognized in financial income, net 3,483,000 (240,000) 10,848,000
Outstanding option contracts 25,878,000 16,762,000  
Cash flow hedge gain reclassified to operating expense (122,000) 208,000 428,000
Other comprehensive income, Gain(loss) on outstanding forward contracts $ 1,445,000 $ (327,000)  
Anti-dilutive shares excluded from computation of earnings per share amount 3,811,680 1,342,904 1,147,378
Minimum
      
Significant Accounting Policies [Line Items]      
Estimated useful lives of intangible assets 2 years    
Maximum
      
Significant Accounting Policies [Line Items]      
Estimated useful lives of intangible assets 20 years