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Segmental Reporting - Summary of Segment Depreciation and Amortization (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Summary of segment depreciation and amortization        
Depreciation $ 2.5 $ 2.1 $ 7.9 $ 6.5
Amortization 3.9 2.4 12.7 6.6
Operating Segments [Member] | Fuel Specialties [Member]
        
Summary of segment depreciation and amortization        
Depreciation 1.0 0.5 3.2 1.7
Amortization 1.9 1.6 6.2 4.8
Operating Segments [Member] | Performance Chemicals [Member]
        
Summary of segment depreciation and amortization        
Depreciation 0.9 0.9 2.8 2.6
Amortization 1.1 0.6 3.7 1.3
Operating Segments [Member] | Octane Additives [Member]
        
Summary of segment depreciation and amortization        
Depreciation 0.1 0.1 0.3 0.5
Amortization 0 0.2 0 0.5
Corporate, Non-Segment [Member]
        
Summary of segment depreciation and amortization        
Depreciation 0.5 0.6 1.6 1.7
Amortization $ 0.9 $ 0 $ 2.8 $ 0