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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, 2019	Mar. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income attributable to IFF stockholders	$ 108,829	$ 129,416
Add: Decrease in redemption value of redeemable noncontrolling interests in excess of earnings allocated	370	0
Net income available to IFF stockholders	$ 109,199	$ 129,416
Weighted average common shares outstanding (basic) (in shares)	111,864	79,018
Weighted average shares assuming dilution (diluted) (in shares)	113,389	79,393
Net income per share - basic (in dollars per share)	$ 0.97	$ 1.63
Net income per share - diluted (in dollars per share)	$ 0.96	$ 1.63
Stock options and restricted stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Adjustment for assumed dilution (in shares)	362	375
SPC portion of TEUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Adjustment for assumed dilution (in shares)	1,163	0

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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