Restructuring and Other Charges, Net - Changes in Employee-Related Restructuring Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Restructuring Reserve [Roll Forward]
Additional charges, net	$ 0	$ 608	$ (170)	$ 912
Fragrance Ingredients Rationalization [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance			759
Additional charges, net			(170)		$ 13,800
Payments and other costs			(469)
Ending Balance	120		120		759
Fragrance Ingredients Rationalization [Member] | Employee -Related Costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance			759
Additional charges, net			(357)
Payments and other costs			(282)
Ending Balance	120		120		759
Fragrance Ingredients Rationalization [Member] | Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance			0
Additional charges, net			187
Payments and other costs			(187)
Ending Balance	$ 0		$ 0		$ 0