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Convertible Senior Notes, Note Hedges, and Warrants - Additional Information (Detail) - USD ($)
1 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Debt Instrument [Line Items]        
Interest rate of debt, stated percentage   0.75%   0.75%
Net carrying amount   $ 315,255,000 $ 304,484,000  
Aggregate amount paid for Note Hedges $ 63,900,000      
Proceeds from sale of warrants 34,500,000      
Liability Component [Member]        
Debt Instrument [Line Items]        
Net carrying amount   315,255,000 304,484,000  
Equity Component [Member]        
Debt Instrument [Line Items]        
Net carrying amount   62,061,000 62,061,000  
Equity Component Gross Value [Member]        
Debt Instrument [Line Items]        
Net carrying amount   $ 63,643,000 $ 63,643,000  
0.75% Convertible Senior Notes Due 2019 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 345,000,000      
Interest rate of debt, stated percentage 0.75% 0.75%    
Debt instrument, maturity year 2019      
Net proceeds from issuance of debt $ 336,300,000      
Net proceeds used to purchase Note Hedges   $ 29,400,000    
Debt instrument, description   The Notes are senior unsecured obligations of EFI with interest payable semiannually in arrears on March 1 and September 1 of each year, commencing March 1, 2015. The Notes are not callable and will mature on September 1, 2019, unless previously purchased or converted in accordance with their terms prior to such date.    
Conversion rate, number of share per $1,000 principal amount   18.9667    
Conversion rate, principal amount of Notes   $ 1,000    
Initial conversion price   $ 52.72    
Debt instrument, Conversion rate description   • if the last reported sale price of our common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; • during the five business day period after any five consecutive trading day period (“Notes Measurement Period”) in which the “trading price” (as the term is defined in the Indenture) per $1,000 principal amount of Notes for each trading day of such Notes Measurement Period was less than 98% of the product of the last reported stock price on such trading day and the conversion rate on each such trading day; • upon the occurrence of specified corporate events; or • at any time on or after March 1, 2019 until the close of business on the second scheduled trading day immediately preceding the maturity date.    
Conversion threshold minimum stock price as a percentage of conversion price   130.00%    
Effective interest rate percentage   4.98%    
Deferred tax liability   $ 23,700,000    
Common stock strike price per share   $ 68.86    
0.75% Convertible Senior Notes Due 2019 [Member] | Debt Issuance Costs [Member]        
Debt Instrument [Line Items]        
Effective interest rate percentage   5.46%    
0.75% Convertible Senior Notes Due 2019 [Member] | Liability Component [Member]        
Debt Instrument [Line Items]        
Debt issuance costs   $ 7,000,000    
0.75% Convertible Senior Notes Due 2019 [Member] | Equity Component [Member]        
Debt Instrument [Line Items]        
Debt issuance costs   $ 1,600,000