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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
Mar. 31, 2020
Mar. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Net income attributable to IFF stockholders $ 124,607 $ 108,829
Add: Reduction in redemption value of redeemable noncontrolling interests in excess of earnings allocated 5,806 370
Net income available to IFF stockholders $ 130,413 $ 109,199
Weighted average common shares outstanding (basic) (in shares) 112,082 111,864
Weighted average shares assuming dilution (diluted) (in shares) 113,594 113,389
Net income per share - basic (in dollars per share) $ 1.16 $ 0.97
Net income per share - diluted (in dollars per share) $ 1.15 $ 0.96
Stock options and restricted stock awards    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Adjustment for assumed dilution (in shares) 349 362
SPC portion of TEUs    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Adjustment for assumed dilution (in shares) 1,163 1,163