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Profit on Disposal of Subsidiary - Additional Information (Detail) - Aroma Chemicals Business Unit [Member] - USD ($)
$ in Millions
12 Months Ended
Jul. 06, 2015
Dec. 31, 2015
Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Equity interest 100.00%    
Cash consideration after transaction cost $ 41.5    
Pre-tax profit of the disposed business   $ 2.6 $ 7.3