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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Line Items]        
Deferred tax benefit recorded as an adjustment to other comprehensive income $ 1,500 $ 3,700    
Foreign and domestic carry-forwards, unamortized research and development cost and state credit carry-forwards 16,400      
Net change in valuation allowance 1,100      
Cash and cash equivalents 79,895 84,550 $ 73,439 $ 58,298
Short-term investments 43,188 34,396    
Short-term liquidity amount 123,100 118,900    
Income tax benefit (expense) from exercise of stock options adjustment to equity   (40) 100  
Unrecognized tax benefits 2,226 2,537 3,334 $ 3,240
Unrecognized tax benefits, effective tax rate 1,700 1,800 2,600  
Accrued interest and penalties 800 900 $ 1,000  
Foreign Subsidiaries [Member]        
Income Tax Disclosure [Line Items]        
Short-term liquidity amount $ 42,100 $ 38,900    
Short-term liquidity, in percentage 34.20% 32.70%    
Minimum [Member]        
Income Tax Disclosure [Line Items]        
Operating loss carry forwards expiration year 2017      
Maximum [Member]        
Income Tax Disclosure [Line Items]        
Operating loss carry forwards expiration year 2030