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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Line Items]        
Deferred tax benefit recorded as an adjustment to other comprehensive income $ 3,700 $ 3,300    
Deferred income tax benefit, foreign (41) (4,320) $ (40)  
Foreign and domestic carry-forwards, unamortized research and development cost and state credit carry-forwards 16,300      
Income tax benefit (expense) from exercise of stock options adjustment to equity (40) 100 200  
Unrecognized tax benefits 2,537 3,334 3,240 $ 2,926
Unrecognized tax benefits, effective tax rate 1,800 2,600 2,500  
Accrued interest and penalties $ 900 $ 1,000 $ 1,000  
Minimum [Member]        
Income Tax Disclosure [Line Items]        
Operating loss carry forwards expiration year 2016      
Maximum [Member]        
Income Tax Disclosure [Line Items]        
Operating loss carry forwards expiration year 2030