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Subsequent Events - Additional Information (Detail) (Independence Oilfield Chemicals LLC [Member], USD $)
In Millions, unless otherwise specified
 9 Months Ended 0 Months Ended
Sep. 30, 2013
Oct. 27, 2014
Subsequent Event [Member]
Oct. 27, 2014
Subsequent Event [Member]
Subsequent Event [Line Items]      
Date of acquisition Oct. 27, 2014    
Acquired membership interests     100.00%
Business acquisition, consideration   $ 212.8  
Business acquisition, initial payment   $ 99.0  
Business acquisition, description   Innospec will make two deferred consideration payments, with the first one payable approximately one year after closing, and the second one payable approximately two years after closing, with a portion of such deferred payments payable, at Innospec's election, in shares of Innospec's common stock.