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Net Income Per Share - Reconciliation of Shares Used in Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Net income attributable to IFF stockholders $ 136,377 $ 99,149 $ 245,206 $ 228,564
Less: Increase in redemption value of redeemable noncontrolling interests in excess of earnings allocated (513) 0 (143) 0
Net income available to IFF stockholders $ 135,864 $ 99,149 $ 245,063 $ 228,564
Weighted average common shares outstanding (basic) (in shares) 111,996 79,065 111,930 79,041
Weighted average shares assuming dilution (diluted) (in shares) 112,872 79,303 113,131 79,347
Net income per share - basic (in dollars per share) $ 1.21 $ 1.25 $ 2.19 $ 2.89
Net income per share - diluted (in dollars per share) $ 1.20 $ 1.25 $ 2.16 $ 2.87
Stock options and restricted stock awards        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Adjustment for assumed dilution (in shares) 424 238 393 306
SPC portion of TEUs        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Adjustment for assumed dilution (in shares) 452 0 808 0