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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
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net Income      
Net income available to IFF stockholders $ 363,228 $ 455,873 $ 337,302
Adjustment related to (increase) decrease in redemption value of redeemable noncontrolling interests in excess of earnings allocated 1,803 (2,097) (2,848)
Net income available to IFF stockholders $ 365,031 $ 453,776 $ 334,454
Shares      
Average number of shares outstanding - basic (in shares) 112,162 111,966 87,551
Average number of shares outstanding - diluted (in shares) 113,630 113,307 88,121
Net Income per Share      
Net income per share - basic (in dollars per share) $ 3.25 $ 4.05 $ 3.81
Net income per share - diluted (in dollars per share) $ 3.21 $ 4.00 $ 3.79
Employee Stock Option And Restricted Stock [Member]      
Shares      
Adjustment for assumed dilution (in shares) 305 356 303
SPC      
Shares      
Adjustment for assumed dilution (in shares) 1,163 985 267